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Associate Software Engineer - San Diego, CA Job Description Associate Software Engineer – San Diego, CA Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: We’re looking for an Associate Software Engineer with a passion for designing and building modern web applications. This role develops tools that power CoStar Group’s proprietary platform , supporting sales and research teams across our portfolio of brands - including Homes.com, CoStar.com, Apartments.com, and LoopNet.com. At CoStar Group, we invest in early-career talent by providing hands-on learning opportunities, meaningful responsibilities, and clear pathways for professional growth. You'll be empowered to contribute ideas, solve complex challenges, and develop both the technical and collaborative skills needed to thrive in a fast-paced, innovative environment. CoStar Group offers competitive compensation, comprehensive benefits, performance-based career advancement, and the opportunity to help shape products that serve millions of users. This position is loc ated in San Diego, C A and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. What You’ll do: At CoStar Group, our engineering teams build innovative, scalable solutions while following industry best practices for software development. You'll collaborate with experienced engineers to write clean, maintainable code, develop automated tests, participate in code reviews, and contribute to cross-functional design and planning discussions. Working alongside talented teammates, you'll gain hands-on experience with modern technologies including but not limited to l eading JavaScript programming language and frameworks such as React, Vue, and Angular, Typescript, backend development language .NET , . NETCore , SQL, NoSQL, Postgres, AWS, Kafka, Databricks, and emerging AI-powered development tools like GitHub Copilot and Claude Code. We're looking for curious, adaptable students who are eager to learn, embrace new technologies , and apply strong software engineering fundamentals to solve meaningful business challenges. This role provides the building blocks for a strong and rewarding technical career, offering mentorship, real-world experience, and continuous opportunities for professional growth. Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Computer Science, Software Engineering, or a comparable major . Must have an expected graduation date of December 2026 - June 2027 . Minimum 3.0 cumulative GPA . At least 2 months of previous relevant internship or co-op experience . Experience applying software engineering fundamentals through coursework, projects, internships, or work experience. Ability to discuss prior internship, project, or academic work, including the problem solved, technical approach, collaboration, and outcomes. Preferred Qualifications and Experiences: Experience writing understandable, maintainable, and well-documented code. Interest in learning new technologies and building high-quality software. Demonstrated initiative and collaboration through academic, internship, extracurricular, or team-based experiences. Familiarity with Agile development practices, the Software Development Lifecycle, APIs, web services, or application design concepts. Exposure to programming languages, databases, cloud concepts, AI/machine learning, frameworks, or other technical tools through coursework, projects, internships, or personal learning. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Associate Software Engineer - Irvine, CA Job Description Associate Software Engineer – Irvine, CA Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: We’re looking for an Associate Software Engineer with a passion for designing and building modern web applications. This role develops tools that power CoStar Group’s proprietary platform , supporting sales and research teams across our portfolio of brands - including Homes.com, CoStar.com, Apartments.com, and LoopNet.com. At CoStar Group, we invest in early-career talent by providing hands-on learning opportunities, meaningful responsibilities, and clear pathways for professional growth. You'll be empowered to contribute ideas, solve complex challenges, and develop both the technical and collaborative skills needed to thrive in a fast-paced, innovative environment. CoStar Group offers competitive compensation, comprehensive benefits, performance-based career advancement, and the opportunity to help shape products that serve millions of users. This position is loc ated in Irvine, CA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. What You’ll do: At CoStar Group, our engineering teams build innovative, scalable solutions while following industry best practices for software development. You'll collaborate with experienced engineers to write clean, maintainable code, develop automated tests, participate in code reviews, and contribute to cross-functional design and planning discussions. Working alongside talented teammates, you'll gain hands-on experience with modern technologies including but not limited to l eading JavaScript programming language and frameworks such as React, Vue, and Angular, Typescript, backend development language .NET , . NETCore , SQL, NoSQL, Postgres, AWS, Kafka, Databricks, and emerging AI-powered development tools like GitHub Copilot and Claude Code. We're looking for curious, adaptable students who are eager to learn, embrace new technologies , and apply strong software engineering fundamentals to solve meaningful business challenges. This role provides the building blocks for a strong and rewarding technical career, offering mentorship, real-world experience, and continuous opportunities for professional growth. Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Computer Science, Software Engineering, or a comparable major . Must have an expected graduation date of December 2026 - June 2027 . Minimum 3.0 cumulative GPA . At least 2 months of previous relevant internship or co-op experience . Experience applying software engineering fundamentals through coursework, projects, internships, or work experience. Ability to discuss prior internship, project, or academic work, including the problem solved, technical approach, collaboration, and outcomes. Preferred Qualifications and Experiences: Experience writing understandable, maintainable, and well-documented code. Interest in learning new technologies and building high-quality software. Demonstrated initiative and collaboration through academic, internship, extracurricular, or team-based experiences. Familiarity with Agile development practices, the Software Development Lifecycle, APIs, web services, or application design concepts. Exposure to programming languages, databases, cloud concepts, AI/machine learning, frameworks, or other technical tools through coursework, projects, internships, or personal learning. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Associate Security Engineer - Arlington, VA Job Description Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: In this role, you'll support the implementation and maintenance of cybersecurity controls across CoStar Group including endpoints, identities, cloud platforms, applications, and business processes . You will learn and reinforce security concepts to technical and non-technical audiences while gaining hands-on experience in areas such as vulnerability management , endpoint security, security tool integration, threat detection and response , software security, and emerging areas such as AI security and automation. Associate Security Engineer s assist with deploying, supporting, and improving security technologies under the guidance of experienced team members. The successful candidate will be a motivated self-starter who is eager to learn new tools, contribute to security efforts, and help strengthen security practices across the CoStar Enterprise. This position is located in Arlington, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday . Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Cybersecurity, Computer Science, Information Technology, Software Engineering, or a comparable major. Must have an expected graduation date of December 2026 - June 2027. Minimum 3.0 cumulative GPA. Demonstrated interest in cybersecurity through personal endeavors outside of undergraduate degree program At least 2 months of previous relevant internship or co-op experience . Exposure to scripting or programming languages such as PowerShell, Bash, Python, or similar languages. Ability to troubleshoot technical issues, identify potential causes, and document findings or recommended next steps. Ability to communicate technical information clearly in written and verbal formats. Ability to follow established processes, document work accurately, and collaborate with technical teams. Preferred Qualifications and Experiences: Sec+ CySA + Security Operation Center experience Ability to describe basic cybersecurity concepts such as vulnerability management, endpoint security, network security, authentication, access controls, or incident response. Exposure to AI, machine learning, automation, or AI security concepts through internship, co-op, academic, or personal projects. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Associate Security Engineer - Richmond, VA Job Description Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: In this role, you'll support the implementation and maintenance of cybersecurity controls across CoStar Group including endpoints, identities, cloud platforms, applications, and business processes . You will learn and reinforce security concepts to technical and non-technical audiences while gaining hands-on experience in areas such as vulnerability management , endpoint security, security tool integration, threat detection and response , software security, and emerging areas such as AI security and automation. Associate Security Engineer s assist with deploying, supporting, and improving security technologies under the guidance of experienced team members. The successful candidate will be a motivated self-starter who is eager to learn new tools, contribute to security efforts, and help strengthen security practices across the CoStar Enterprise. This position is located in Richmond, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday . Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Cybersecurity, Computer Science, Information Technology, Software Engineering, or a comparable major. Must have an expected graduation date of December 2026 - June 2027. Minimum 3.0 cumulative GPA. Demonstrated interest in cybersecurity through personal endeavors outside of undergraduate degree program At least 2 months of previous relevant internship or co-op experience . Exposure to scripting or programming languages such as PowerShell, Bash, Python, or similar languages. Ability to troubleshoot technical issues, identify potential causes, and document findings or recommended next steps. Ability to communicate technical information clearly in written and verbal formats. Ability to follow established processes, document work accurately, and collaborate with technical teams. Preferred Qualifications and Experiences: Sec+ CySA + Security Operation Center experience Ability to describe basic cybersecurity concepts such as vulnerability management, endpoint security, network security, authentication, access controls, or incident response. Exposure to AI, machine learning, automation, or AI security concepts through internship, co-op, academic, or personal projects. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Associate Software Engineer - Richmond, VA Job Description Associate Software Engineer – Richmond Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: We’re looking for an Associate Software Engineer with a passion for designing and building modern web applications. This role develops tools that power CoStar Group’s proprietary platform , supporting sales and research teams across our portfolio of brands - including Homes.com, CoStar.com, Apartments.com, and LoopNet.com. At CoStar Group, we invest in early-career talent by providing hands-on learning opportunities, meaningful responsibilities, and clear pathways for professional growth. You'll be empowered to contribute ideas, solve complex challenges, and develop both the technical and collaborative skills needed to thrive in a fast-paced, innovative environment. CoStar Group offers competitive compensation, comprehensive benefits, performance-based career advancement, and the opportunity to help shape products that serve millions of users . This position is loc ated in Richmond, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. What You’ll do: At CoStar Group, our engineering teams build innovative, scalable solutions while following industry best practices for software development. You'll collaborate with experienced engineers to write clean, maintainable code, develop automated tests, participate in code reviews, and contribute to cross-functional design and planning discussions. Working alongside talented teammates, you'll gain hands-on experience with modern technologies including but not limited to l eading JavaScript programming language and frameworks such as React, Vue, and Angular, Typescript, backend development language .NET , . NETCore , SQL, NoSQL, Postgres, AWS, Kafka, Databricks, and emerging AI-powered development tools like GitHub Copilot and Claude Code. We're looking for curious, adaptable students who are eager to learn, embrace new technologies , and apply strong software engineering fundamentals to solve meaningful business challenges. This role provides the building blocks for a strong and rewarding technical career, offering mentorship, real-world experience, and continuous opportunities for professional growth. Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Computer Science, Software Engineering, or a comparable major . Must have an expected graduation date of December 2026 - June 2027 . Minimum 3.0 cumulative GPA . At least 2 months of previous relevant internship or co-op experience . Experience applying software engineering fundamentals through coursework, projects, internships, or work experience. Ability to discuss prior internship, project, or academic work, including the problem solved, technical approach, collaboration, and outcomes. Preferred Qualifications and Experiences: Experience writing understandable, maintainable, and well-documented code. Interest in learning new technologies and building high-quality software. Demonstrated initiative and collaboration through academic, internship, extracurricular, or team-based experiences. Familiarity with Agile development practices, the Software Development Lifecycle, APIs, web services, or application design concepts. Exposure to programming languages, databases, cloud concepts, AI/machine learning, frameworks, or other technical tools through coursework, projects, internships, or personal learning. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Security Engineer Intern - Arlington, VA Job Description Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: We are seeking a Security Engineering Intern to join our team, where you'll gain hands-on experience in a large enterprise cybersecurity program in areas such as vulnerability management, endpoint security, threat detection , security controls , and emerging areas such as AI security. CoStar Group’s Security Engineering internship program provides hands-on experience through three workstreams : 1. D evelop a working prototype to solve a cybersecurity challenge. 2. Perform cybersecurity operations such as responding to alerts, analyzing findings, or tuning controls. 3. Assist in a cybersecurity project while learning from experienced team members and building a foundation in modern cybersecurity practices. Each intern is paired with a dedicated mentor to support technical development, career growth, and day-to-day learning throughout the program. This internship is designed to provide exposure to the types of work performed by Security Engineers and help prepare students for future careers in cybersecurity. This position is located in Arlington, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday . Technologies & Security Areas You May Explore At CoStar Group, our Security Engineering team uses a variety of tools and technologies to help identify , prevent, detect, and respond to cybersecurity risks across the enterprise. Depending on the team and project, interns may gain exposure to: Vulnerability scanning and vulnerability management tools Endpoint security technologies Security monitoring and incident response processes Security tool integrations and automation Identity and access management concepts Cloud and infrastructure security concepts Scripting and automation using Python, PowerShell, Bash, or similar technologies AI security and emerging cybersecurity technologies Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Cybersecurity, Computer Science, Information Technology, Software Engineering, or a comparable major. Must be planning to return to school following the completion of the Summer 2027 internship. Must have an expected graduation date of December 202 7 - June 202 8 . Minimum 3.0 cumulative GPA. Demonstrated interest in cybersecurity through personal endeavors outside of undergraduate degree program Available to participate in the full 10-week summer internship program and commit to a 40-hour work week throughout the internship. Coursework, project, internship, research, or work experience related to cybersecurity, networking, operating systems, cloud computing, scripting, automation, system administration, or comparable technical disciplines. Ability to communicate technical information clearly in written and verbal formats. Strong analytical, troubleshooting, and problem-solving skills. Preferred Qualifications and Experiences: Ability to describe cybersecurity concepts such as vulnerability management, endpoint security, network security, authentication, access controls, or incident response. Exposure to scripting or automation using Python, PowerShell, Bash, or similar languages. Familiarity with Windows, Linux, networking, or cloud environments. Demonstrated initiative through cybersecurity projects, coursework, research, clubs, competitions, or extracurricular activities. Experience collaborating on academic, project, research, or team-based work. Exposure to AI, machine learning, automation, or AI security concepts through coursework, projects, internships, or personal learning. Security certifications or coursework such as Security+, Network+, CySA +, or comparable cybersecurity training are a plus. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $40 - $45 (Hourly) We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Security Engineer Intern - Richmond, VA Job Description Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: We are seeking a Security Engineering Intern to join our team, where you'll gain hands-on experience in a large enterprise cybersecurity program in areas such as vulnerability management, endpoint security, threat detection , security controls , and emerging areas such as AI security. CoStar Group’s Security Engineering internship program provides hands-on experience through three workstreams : 1. D evelop a working prototype to solve a cybersecurity challenge. 2. Perform cybersecurity operations such as responding to alerts, analyzing findings, or tuning controls. 3. Assist in a cybersecurity project while learning from experienced team members and building a foundation in modern cybersecurity practices. Each intern is paired with a dedicated mentor to support technical development, career growth, and day-to-day learning throughout the program. This internship is designed to provide exposure to the types of work performed by Security Engineers and help prepare students for future careers in cybersecurity. This position is located in Richmond, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday . Technologies & Security Areas You May Explore At CoStar Group, our Security Engineering team uses a variety of tools and technologies to help identify , prevent, detect, and respond to cybersecurity risks across the enterprise. Depending on the team and project, interns may gain exposure to: Vulnerability scanning and vulnerability management tools Endpoint security technologies Security monitoring and incident response processes Security tool integrations and automation Identity and access management concepts Cloud and infrastructure security concepts Scripting and automation using Python, PowerShell, Bash, or similar technologies AI security and emerging cybersecurity technologies Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Cybersecurity, Computer Science, Information Technology, Software Engineering, or a comparable major. Must be planning to return to school following the completion of the Summer 2027 internship. Must have an expected graduation date of December 202 7 - June 202 8 . Minimum 3.0 cumulative GPA. Demonstrated interest in cybersecurity through personal endeavors outside of undergraduate degree program Available to participate in the full 10-week summer internship program and commit to a 40-hour work week throughout the internship. Coursework, project, internship, research, or work experience related to cybersecurity, networking, operating systems, cloud computing, scripting, automation, system administration, or comparable technical disciplines. Ability to communicate technical information clearly in written and verbal formats. Strong analytical, troubleshooting, and problem-solving skills. Preferred Qualifications and Experiences: Ability to describe cybersecurity concepts such as vulnerability management, endpoint security, network security, authentication, access controls, or incident response. Exposure to scripting or automation using Python, PowerShell, Bash, or similar languages. Familiarity with Windows, Linux, networking, or cloud environments. Demonstrated initiative through cybersecurity projects, coursework, research, clubs, competitions, or extracurricular activities. Experience collaborating on academic, project, research, or team-based work. Exposure to AI, machine learning, automation, or AI security concepts through coursework, projects, internships, or personal learning. Security certifications or coursework such as Security+, Network+, CySA +, or comparable cybersecurity training are a plus. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $40 - $45 (Hourly) We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

Associate Software Engineer - Arlington, VA Job Description Associate Software Engineer – Arlington Company Overview: CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate. Learn more about CoStar . Role Description: We’re looking for an Associate Software Engineer with a passion for designing and building modern web applications. This role develops tools that power CoStar Group’s proprietary platform , supporting sales and research teams across our portfolio of brands - including Homes.com, CoStar.com, Apartments.com, and LoopNet.com. At CoStar Group, we invest in early-career talent by providing hands-on learning opportunities, meaningful responsibilities, and clear pathways for professional growth. You'll be empowered to contribute ideas, solve complex challenges, and develop both the technical and collaborative skills needed to thrive in a fast-paced, innovative environment. CoStar Group offers competitive compensation, comprehensive benefits, performance-based career advancement, and the opportunity to help shape products that serve millions of users . This position is loc ated in Arlington, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday. What You’ll do: At CoStar Group, our engineering teams build innovative, scalable solutions while following industry best practices for software development. You'll collaborate with experienced engineers to write clean, maintainable code, develop automated tests, participate in code reviews, and contribute to cross-functional design and planning discussions. Working alongside talented teammates, you'll gain hands-on experience with modern technologies including but not limited to l eading JavaScript programming language and frameworks such as React, Vue, and Angular, Typescript, backend development language .NET , . NETCore , SQL, NoSQL, Postgres, AWS, Kafka, Databricks, and emerging AI-powered development tools like GitHub Copilot and Claude Code. We're looking for curious, adaptable students who are eager to learn, embrace new technologies , and apply strong software engineering fundamentals to solve meaningful business challenges. This role provides the building blocks for a strong and rewarding technical career, offering mentorship, real-world experience, and continuous opportunities for professional growth. Basic Qualifications: Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Computer Science, Software Engineering, or a comparable major . Must have an expected graduation date of December 2026 - June 2027 . Minimum 3.0 cumulative GPA . At least 2 months of previous relevant internship or co-op experience . Experience applying software engineering fundamentals through coursework, projects, internships, or work experience. Ability to discuss prior internship, project, or academic work, including the problem solved, technical approach, collaboration, and outcomes. Preferred Qualifications and Experiences: Experience writing understandable, maintainable, and well-documented code. Interest in learning new technologies and building high-quality software. Demonstrated initiative and collaboration through academic, internship, extracurricular, or team-based experiences. Familiarity with Agile development practices, the Software Development Lifecycle, APIs, web services, or application design concepts. Exposure to programming languages, databases, cloud concepts, AI/machine learning, frameworks, or other technical tools through coursework, projects, internships, or personal learning. What’s in it for you? When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement. Our benefits package includes (but is not limited to): Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug Life, legal, and supplementary insurance Virtual and in person mental health counseling services for individuals and family Commuter and parking benefits 401(K) retirement plan with matching contributions Employee stock purchase plan Paid time off Tuition reimbursement On-site fitness center and/or reimbursed fitness center membership costs (location dependent) Access to CoStar Group’s Employee Resource Groups Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies. Base Compensation: $100,000 - $105,000 annually We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing