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The role You will build and improve the WebCompat team’s internal tooling, the dashboards and the broken-site-report screenshot pipeline the team relies on to triage and prioritize site breakage. This is a focused tooling role that makes the WebCompat program faster and more data-driven. Responsibilities Build and improve WebCompat dashboards (triage, reporting, and metrics). Improve the broken-site-report screenshot capture and pipeline. Work with the WebCompat team (including QA) to turn reporting and triage needs into reliable tooling. Required qualifications Solid web development (JavaScript, HTML, CSS, Python & Django) and experience building dashboards / data views. Comfort with tooling, automation, and web services. Self-directed, with good written communication. Preferred Familiarity with WebCompat workflows and Bugzilla. Experience with screenshot / automation pipelines. Experience with Machine Learning

The role You will build and improve the WebCompat team’s internal tooling, the dashboards and the broken-site-report screenshot pipeline the team relies on to triage and prioritize site breakage. This is a focused tooling role that makes the WebCompat program faster and more data-driven. Responsibilities Build and improve WebCompat dashboards (triage, reporting, and metrics). Improve the broken-site-report screenshot capture and pipeline. Work with the WebCompat team (including QA) to turn reporting and triage needs into reliable tooling. Required qualifications Solid web development (JavaScript, HTML, CSS, Python & Django) and experience building dashboards / data views. Comfort with tooling, automation, and web services. Self-directed, with good written communication. Preferred Familiarity with WebCompat workflows and Bugzilla. Experience with screenshot / automation pipelines. Experience with Machine Learning

The role You will build and improve the WebCompat team’s internal tooling, the dashboards and the broken-site-report screenshot pipeline the team relies on to triage and prioritize site breakage. This is a focused tooling role that makes the WebCompat program faster and more data-driven. Responsibilities Build and improve WebCompat dashboards (triage, reporting, and metrics). Improve the broken-site-report screenshot capture and pipeline. Work with the WebCompat team (including QA) to turn reporting and triage needs into reliable tooling. Required qualifications Solid web development (JavaScript, HTML, CSS, Python & Django) and experience building dashboards / data views. Comfort with tooling, automation, and web services. Self-directed, with good written communication. Preferred Familiarity with WebCompat workflows and Bugzilla. Experience with screenshot / automation pipelines. Experience with Machine Learning

The role You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness. Responsibilities Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed Fix the problems and pass the tests to improve the Gecko correctness Work through code review with the relevant Gecko module owners and iterate to landing Definition of done Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance and strategic projects. Required qualifications Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko. Solid Javascript and applying that language skill to write automated tests. Proficiency in and experience developing software in C++. Strong debugging skills in a mature larget codebase. Comfort working in the open: public bugs, code review, and upstream landing. Preferred Prior contributions to Gecko or another major browser engine. Familiarity with web standards and Web Platform Tests.

The role You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness. Responsibilities Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed Fix the problems and pass the tests to improve the Gecko correctness Work through code review with the relevant Gecko module owners and iterate to landing Definition of done Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance and strategic projects. Required qualifications Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko. Solid Javascript and applying that language skill to write automated tests. Proficiency in and experience developing software in C++. Strong debugging skills in a mature larget codebase. Comfort working in the open: public bugs, code review, and upstream landing. Preferred Prior contributions to Gecko or another major browser engine. Familiarity with web standards and Web Platform Tests.

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! Working in the open is the norm, and we contribute to the code driving the Firefox browser on a number of desktop platforms - Windows, Linux, and macOS. Our focus is on implementing and fixing things in Firefox as well as helping other teams make it excellent for our users. A Frontend Engineering Manager directs a team of geographically distributed engineers to constantly drive improvements to Firefox Desktop experience through innovations and enhancements to the browser user interface in Firefox. We need a leader who is dedicated to building exceptional teams, creating innovative solutions, delivering quality software, and influencing how the world uses the internet. Feel good about your work again! Pursue your future while working to protect the future of the internet for everyone, everywhere. What you’ll do: Drive initiatives to deliver value to our users ensuring the software your team delivers is high quality, highly available, monitored, and maintainable. Help the team navigate trade-offs and drive alignment in a fast-paced field; balancing quick delivery with thoughtful, long-term approaches across a portfolio of user experiences in the browser. Communicate your team’s goals, the scope and risks of your projects, and own the delivery of initiatives on clear timelines. Identify, build and iterate on engineering processes that support a high performing team. Engage regularly 1-1 with your team to discuss both technical work and professional development; provide direct and honest feedback about their individual performances Ensure developers are properly supported and empowered throughout the developer lifecycle. Create an inclusive environment which engages and challenges your team members. Work collaboratively with many teams including Product, UX, QA, Operations, and Data Science. What you’ll bring: 4+ years leading engineers in a software development environment and working across multiple distributed teams. Software engineering background that empowers you to drive technical decisions within the team and engage with engineers at all levels of seniority to triage, prioritize and implement. Experience leading multiple concurrent projects. Previous experience working on frontend platform initiatives e.g. design systems and frontend architectural improvements. Track record of delivering front-end experiences to user-facing products Hands-on experience with web technologies (JavaScript/TypeScript, HTML, and CSS). Proven track record successfully leading and shipping sophisticated user facing experiences on time, using data to inform timelines. . Strong communication and ability to develop positive relationships with others, regardless of their rank or role. Passion to resolve problems, manage risk, lead change, and facilitate collaborative decision-making. Experience effectively communicating with senior leadership and advocating for engineering priorities. Desire to grow and learn as a manager, grow and develop others, and get results through others rather than personal technical proficiency. Able to hire, mentor, empower, develop, and delegate to geographically distributed team members with different skills from your own. Commitment to our values: Welcoming differences Being relationship-minded Practicing responsible participation Having grit Bonus points for: Fostering the use of AI in Frontend engineering teams. Experience working in open source environments. What you’ll get: Generous performance-based bonus plans to all eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientation s, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: D #LI-REMOTE Req ID: R3136 Hiring Ranges: Canada Tier 1 Locations $165,000 — $220,000 CAD Canada Tier 2 Locations $149,000 — $199,000 CAD

The role You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness. Responsibilities Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed Fix the problems and pass the tests to improve the Gecko correctness Work through code review with the relevant Gecko module owners and iterate to landing Definition of done Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance and strategic projects. Required qualifications Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko. Solid Javascript and applying that language skill to write automated tests. Proficiency in and experience developing software in C++. Strong debugging skills in a mature larget codebase. Comfort working in the open: public bugs, code review, and upstream landing. Preferred Prior contributions to Gecko or another major browser engine. Familiarity with web standards and Web Platform Tests.

Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The Firefox team is a community of engineers who care deeply about delivering the fastest, friendliest, most usable browser possible. We are responsible for making the things you see in the browser work securely, quickly, and well! Working in the open is the norm, and we contribute to the code driving the Firefox browser on a number of desktop platforms - Windows, Linux, and macOS. Our focus is on implementing and fixing things in Firefox as well as helping other teams make it excellent for our users. A Frontend Engineering Manager directs a team of geographically distributed engineers to constantly drive improvements to Firefox Desktop experience through innovations and enhancements to the browser user interface in Firefox. We need a leader who is dedicated to building exceptional teams, creating innovative solutions, delivering quality software, and influencing how the world uses the internet. Feel good about your work again! Pursue your future while working to protect the future of the internet for everyone, everywhere. What you’ll do: Drive initiatives to deliver value to our users ensuring the software your team delivers is high quality, highly available, monitored, and maintainable. Help the team navigate trade-offs and drive alignment in a fast-paced field; balancing quick delivery with thoughtful, long-term approaches across a portfolio of user experiences in the browser. Communicate your team’s goals, the scope and risks of your projects, and own the delivery of initiatives on clear timelines. Identify, build and iterate on engineering processes that support a high performing team. Engage regularly 1-1 with your team to discuss both technical work and professional development; provide direct and honest feedback about their individual performances Ensure developers are properly supported and empowered throughout the developer lifecycle. Create an inclusive environment which engages and challenges your team members. Work collaboratively with many teams including Product, UX, QA, Operations, and Data Science. What you’ll bring: 4+ years leading engineers in a software development environment and working across multiple distributed teams. Software engineering background that empowers you to drive technical decisions within the team and engage with engineers at all levels of seniority to triage, prioritize and implement. Experience leading multiple concurrent projects. Previous experience working on frontend platform initiatives e.g. design systems and frontend architectural improvements. Track record of delivering front-end experiences to user-facing products Hands-on experience with web technologies (JavaScript/TypeScript, HTML, and CSS). Proven track record successfully leading and shipping sophisticated user facing experiences on time, using data to inform timelines. . Strong communication and ability to develop positive relationships with others, regardless of their rank or role. Passion to resolve problems, manage risk, lead change, and facilitate collaborative decision-making. Experience effectively communicating with senior leadership and advocating for engineering priorities. Desire to grow and learn as a manager, grow and develop others, and get results through others rather than personal technical proficiency. Able to hire, mentor, empower, develop, and delegate to geographically distributed team members with different skills from your own. Commitment to our values: Welcoming differences Being relationship-minded Practicing responsible participation Having grit Bonus points for: Fostering the use of AI in Frontend engineering teams. Experience working in open source environments. What you’ll get: Generous performance-based bonus plans to all eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly all-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About Mozilla Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online. Commitment to diversity, equity, inclusion, and belonging Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission. We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientation s, gender identities, and expressions. We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation. We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws. Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose. Group: D #LI-REMOTE Req ID: R3136 Hiring Ranges: US Tier 1 Locations $195,000 — $260,000 USD US Tier 2 Locations $179,000 — $239,000 USD US Tier 3 Locations $166,000 — $221,000 USD