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About PayPay PayPay is a FinTech company that has grown to over 75M (as of August 2026) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries. OUR VISION IS UNLIMITED_ We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. 2018年にサービスを開始してから約8年でユーザー数7500万人を突破したフィンテック企業であるPayPayは約50か国の国と地域から集まった多様なメンバーで構成されています。 OUR VISION IS UNLIMITED_ 我々は自分たちの想像を超える未来を創るためにあえて明確なビジョンは必要ないと考えています。常にDay1であるスタンスを忘れずに、誰もが想像できないようなビジョン（未来）を実現していくのがPayPayです。 この壮大なビジョンに前向きに取り組み、他社に真似できない圧倒的なスピードでプロダクトを磨き上げ、日本のキャッシュレス決済、またそれを使用した金融ライフプラットフォームとしての普及を一気に推進することにプロフェッショナルとして情熱を持って取り組み、自ら課題発見し、周囲と協力して新しい価値創出を共に推進する仲間を募集します。 ▼関連コンテンツ 【PayPayが仕掛ける金融革命】米国ナスダック上場は通過点／デジタル金融プラットフォームに進化／決済・投資・貯蓄・保険などすべてPayPay／内製でシステム開発する理由／グローバル標準の金融サービス Job Description About the Organization/Team・組織/チームについて PayPay Bank is responsible for developing the financial infrastructure that supports the PayPay Group's financial services. Our team drives the entire process, from core system cloud infrastructure design and construction to operations and standardization, led by our own engineers. Beyond simply building and maintaining infrastructure, our role encompasses: Evolve our infrastructure while maintaining high reliability Design cloud architectures for future scalability and high-volume transactions Build development organizations and cloud deployment processes themselves As this is a newly established organization, you will have the opportunity to proactively engage in promoting standardization and building culture. ※ After joining the company, you are expected to be seconded to PayPay Bank as a member of the above project. PayPay銀行は、PayPayグループの金融サービスを支える金融基盤の開発を担っています。 私たちのチームは、コアシステムのクラウドインフラ設計・構築から運用・標準化までを自社エンジニアが主体となって推進しています。 単にインフラを構築・維持するだけではなく、 高い信頼性を維持しながらインフラを進化させること 将来のサービス拡張や大量トランザクションを見越したクラウドアーキテクチャを設計すること 開発組織やクラウドデプロイプロセスそのものをつくること までが私たちの役割です。 新しい組織だからこそ、標準化推進や文化づくりにも主体的に関わることができます。 【Engineering for New Bank Project】Recruiting Factbook ※入社後に上記プロジェクトメンバーとしてPayPay銀行への出向を予定しています。 Background of Recruitment・募集の背景 At PayPay Group, we are accelerating the evolution of financial services across payment, banking, card, and securities. The banking system that serves as the foundation for these services requires unprecedented levels of: Flexibility Scalability Development speed High quality With the rapid expansion of our infrastructure's importance and scale accompanying business growth, we are looking for Cloud Infrastructure Engineers to support mission-critical systems and improve development efficiency and stability. PayPayグループでは、決済・銀行・カード・証券を横断した金融サービスの進化を加速しています。 その基盤となる銀行システムには、これまで以上に 柔軟性 拡張性 開発スピード 高い品質 が求められています。 事業成長に伴いインフラ基盤の重要性と規模が急速に拡大しており、ミッションクリティカルなシステムを支え、開発効率と安定性を向上させるクラウドインフラエンジニアを広く募集しています。 Job Responsibilities・具体的な業務内容 Architect and Build Robust, Scalable, and Stable Infrastructure Architect cloud infrastructure that achieves high reliability as a financial platform Architect and build multi-zone infrastructure with AWS regional level failure tolerance Maintain and evolve an infrastructure base where patching and upgrades can be easily implemented without service downtime Promote Security and Automation Provision secure infrastructure in collaboration with Security Engineers Promote and standardize Infrastructure as Code (IaC) using Terraform and other tools Continuous Improvement of Development Environment and Deployment Processes AWS deployment automation to ensure fast and secure delivery of cloud services to developers Provide means for developers to easily deploy AWS resources through automation Improve observability, monitoring, alerting, and failure analysis 高信頼・高拡張なクラウドインフラの設計・構築 金融プラットフォームとして高い信頼性を実現するクラウドインフラアーキテクチャ設計 AWSのリージョンレベルの障害にも耐えうるマルチゾーン・耐障害性インフラの設計・構築 パッチ適用やアップグレードを、サービス停止なしで容易に実施できるインフラ基盤の維持・進化 セキュリティと自動化の推進 セキュリティエンジニアと連携した、安全なインフラ環境の構築 Terraform等を用いた Infrastructure as Code (IaC) の推進・標準化 開発環境・デプロイプロセスの継続的改善 開発者へクラウドサービスを迅速かつ安全に提供するための AWS デプロイ自動化 開発者が AWS リソースを容易にデプロイできる仕組みの提供 可観測性（Observability）の向上、モニタリング、アラート改善、障害分析 Tech Stack AWS: VPC, NLB, EKS, ECS, EC2, Lambda, Cloudfront, RDS, ElastiCache, DynamoDB, Opensearch, S3, CloudWatch, Cognito, SQS, KMS, Secret Manager, KMS, MSK, SES, Transfer Family, Shield, WAF, GuardDuty, IAM Identity Center, WorkSpaces, CloudFormation, Transit Gateway, Direct Connect etc Other services Terraform, Github Actions, Prometheus, Grafana, Atlantis, ArgoCD, OpenTelemetry, Backstage, Pagerduty Attractiveness of This Position・本ポジションの魅力 ［Tech Challenges］ In this position, you will face technical challenges unique to financial systems: High-availability and high-reliability cloud architecture design Infrastructure change management and release design achieving Zero Downtime Multi-account governance and security design for large-scale AWS environments Modernization of cloud infrastructure with an eye toward future scalability and cost optimization Modernization of Financial Infrastructure Improve architecture utilizing the latest AWS services, Kubernetes, and IaC while maintaining the reliability of long-established financial systems. Mission-Critical System Development Experience large-scale infrastructure design and construction considering multi-region support, high availability, and fault tolerance for financial systems where downtime is not permitted. Ability to Design the Entire System Involved in overall infrastructure design including container platforms (EKS/ECS), networks, storage, and CI/CD pipelines. Scale Unique to the PayPay Group Evolve large-scale infrastructure supporting financial services across the entire PayPay Group, not just for the bank alone. ［Tech Challenges］ このポジションでは、金融システムならではの技術課題に向き合います。 高可用・高信頼なクラウドアーキテクチャ設計 サービス無停止（Zero Downtime）を実現するインフラ変更管理・リリース設計 大規模なAWS環境におけるマルチアカウント統制とセキュリティ設計 将来の拡張性とコスト最適化を見据えたクラウド基盤のモダナイゼーション 金融基盤のモダナイゼーションに携われる 長年培われた金融システムの信頼性を維持しながら、最新のAWSサービスやKubernetes、IaCを活用したアーキテクチャの改善を進めます。 ミッションクリティカルなシステム開発 停止が許されない金融システムだからこそ、マルチリージョン対応や高可用性・耐障害性を考慮した大規模インフラの設計・構築を経験できます。 システム全体を設計できる コンテナプラットフォーム（EKS/ECS）、ネットワーク、ストレージからCI/CDパイプラインまで含めたインフラ全体の設計に携われます。 PayPayグループならではのスケール 銀行単体ではなく、PayPayグループ全体の金融サービスを支える大規模インフラ基盤の進化に携われます。 Required Experience/Skills・必要な経験/スキル 5+ years of extensive technical hands-on and architecture design experience with infrastructure/platform using AWS Broad practical experience with AWS computing, networking, storage, and analytics services Experience with Terraform based infrastructure as code (IAC) on AWS Experience in production level infrastructure change management and releases for high traffic & business-critical systems Experience in Cloud infrastructure and platform systems availability, performance and cost management Experience with multi-account operations for large-scale AWS environments Strong understanding of cloud security best practices in Fintech Industry Demonstrated skill in programming and scripting languages, including Python, Shell Scripting, Go, and Rust Excellent oral, written, and interpersonal communication skills Japanese business proficiency equivalent to JLPT N1 or N2 AWS を利用したインフラストラクチャ・プラットフォームについて、5年以上の技術経験およびアーキテクチャ設計経験 AWS のコンピューティング、ネットワーク、ストレージ、分析系サービスに関する幅広い実務経験 Terraform を使用した AWS 上の Infrastructure as Code (IaC) の実務経験 高トラフィックかつ業務上重要な本番システムにおける、インフラ変更管理およびリリース経験 クラウドインフラやプラットフォームの可用性、パフォーマンス、コスト管理の経験 Python、シェルスクリプト、Go、Rustなどを使用したプログラミングおよびスクリプト作成の経験・スキル 日本語での業務遂行が可能な方（母国語、または日本語能力試験 JLPT N1/N2相当） Desired Experience/Skills・あると望ましい経験/スキル Experience with multi-account operations for large-scale AWS environments Experience with Kubernetes (EKS) construction and operation, or certifications such as CKA, CKAD, or CKS Certified at the AWS Professional or Specialty level Experience in payment industry compliance standards such as PCI DSS Experience with other cloud service providers (e.g., GCP, Azure) Experience in AI/ML infrastructure design and operations ​​Experience using and contributing to Open Source tools Published papers / blogs / articles Bilingual in English and Japanese 大規模なAWS環境におけるマルチアカウント運用の経験 Kubernetes（EKS）の構築・運用経験、または CKA/CKAD/CKS 等の資格 AWS Professional または Specialty レベルの認定資格 PCI DSS など、金融・決済業界のコンプライアンス基準に関する経験 GCP や Azure など、AWS 以外のクラウドサービスの利用経験 AI/機械学習インフラの設計・運用経験 オープンソースツールへの寄与、または技術ブログ・記事の執筆経験 英語と日本語のバイリンガル Desired Candidate Profile・求める人物像 Individuals who can embrace and enjoy change Individuals who can approach everything with a strong sense of ownership Individuals who can logically structure their thoughts and communicate effectively 変化を楽しめる方 当事者意識をもって何事も取り組むことができる方 ものごとを論理的に組み立ててコミュニケーションが取れる方 PayPay 5 senses Please refer PayPay 5 senses to learn what we value at work Working Conditions Employment Status Full Time Office Location Hybrid Workstyle ※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives. LIFE in JAPAN FACTBOOK Work Hours Super Flex Time (No Core Time) In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break) Holidays Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days Paid leave Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire) Personal leave (5 days each year, granted proportionally according to the month of employment） ＊PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc. Salary Annual salary paid in 12 installments (monthly) Based on skills, experience, and abilities Reviewed once a year Late overtime allowance ※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you Benefits Social Insurance (health insurance, employee pension, employment insurance and compensation insurance) 401K Translation/Interpretation support VISA sponsor + Relocation support 待遇・条件 雇用形態 正社員 勤務地 Hybrid Workstyle ※所属組織のルールおよび業務指示に応じて出社対応頂きます。 勤務時間 スーパーフレックス制（コアタイム無し） 原則：午前9時～午後5時45分（実働7時間45分＋休憩時間 1時間） 休日 土日祝日、年末年始および会社指定日 休暇（法定 休暇 および会社 福利厚生） 年次有給休暇(初年度14日間、入社月に応じて按分付与。入社日から使用可） パーソナル休暇（毎年度５日間付与/初年度入社月により3日間もしくは5日間付与） ※PayPay独自の特別有給休暇制度で、本人/家族/ペットなどの病気/ケガ/通院付き添い等にご使用頂けます。 給与 年俸制（一部固定残業代含む） 経験、スキル、業績、貢献度に応じ当社規定により決定 毎年1回見直し 時間外勤務手当、深夜勤務手当有 ※給与支給について、一部をPayPayアカウントで受け取ることが可能です（給与デジタル支払いに対応） ベネフィット 社会保険（健康保険、厚生年金、雇用保険、労災保険） 企業型確定拠出年金制度 語学学習のサポート Other Information: PayPay Inside-Out (Corporate Blog) /JP PayPay Inside-out (Corporate Blog) /ENG PayPay Product Blog /JP PayPay Product Blog /ENG PIVOT動画：【PayPayが仕掛ける金融革命】

About PayPay PayPay is a FinTech company that has grown to over 75M (as of August 2026) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries. OUR VISION IS UNLIMITED_ We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. 2018年にサービスを開始してから約8年でユーザー数7500万人を突破したフィンテック企業であるPayPayは約50か国の国と地域から集まった多様なメンバーで構成されています。 OUR VISION IS UNLIMITED_ 我々は自分たちの想像を超える未来を創るためにあえて明確なビジョンは必要ないと考えています。常にDay1であるスタンスを忘れずに、誰もが想像できないようなビジョン（未来）を実現していくのがPayPayです。 この壮大なビジョンに前向きに取り組み、他社に真似できない圧倒的なスピードでプロダクトを磨き上げ、日本のキャッシュレス決済、またそれを使用した金融ライフプラットフォームとしての普及を一気に推進することにプロフェッショナルとして情熱を持って取り組み、自ら課題発見し、周囲と協力して新しい価値創出を共に推進する仲間を募集します。 ※ PayPay株式会社へご応募いただく際にはPayPayカード株式会社、PayPay証券株式会社へ併願応募はご遠慮いただいております。ご了承ください。 ▼関連コンテンツ 【PayPayが仕掛ける金融革命】米国ナスダック上場は通過点／デジタル金融プラットフォームに進化／決済・投資・貯蓄・保険などすべてPayPay／内製でシステム開発する理由／グローバル標準の金融サービス Job Description About the Organization/Team・組織/チームについて PayPay Bank is responsible for developing the financial infrastructure that supports the financial services of the PayPay Group. Our team is driven by our in-house engineers, from the design and development of the core system to its operation. Our role is not just to develop functions, but to: Evolve the system while maintaining high reliability Design an architecture that anticipates future service expansion Create the development organization and development process itself Because it is a new organization, you can proactively participate in technology selection and the creation of development culture. ※ After joining the company, you are expected to be seconded to PayPay Bank as a member of the above project. PayPay銀行は、PayPayグループの金融サービスを支える金融基盤の開発を担っています。 私たちのチームは、コアシステムの設計・開発から運用までを自社エンジニアが主体となって推進しています。 単に機能を開発するだけではなく、 高い信頼性を維持しながらシステムを進化させること 将来のサービス拡張を見据えたアーキテクチャを設計すること 開発組織や開発プロセスそのものをつくること までが私たちの役割です。 新しい組織だからこそ、技術選定や開発文化づくりにも主体的に関わることができます。 【Engineering for New Bank Project】Recruiting Factbook ※入社後に上記プロジェクトメンバーとしてPayPay銀行への出向を予定しています。 Background of Recruitment・募集の背景 At the PayPay Group, we are accelerating the evolution of financial services across payments, banking, cards, and securities. The banking system that forms the foundation for this requires more than ever: Flexibility Scalability Development speed High quality To continue meeting these technical demands, we are broadly recruiting not only engineers with experience in financial system development but also backend engineers with experience in large-scale web services and platform development. PayPayグループでは、決済・銀行・カード・証券を横断した金融サービスの進化を加速しています。 その基盤となる銀行システムには、これまで以上に 柔軟性 拡張性 開発スピード 高い品質 が求められています。 こうした技術的な要求に応え続けるため、金融システム開発の経験を持つエンジニアだけでなく、大規模Webサービスやプラットフォーム開発の経験を持つバックエンドエンジニアも広く募集しています。 Job Responsibilities・具体的な業務内容 Design of highly reliable financial infrastructure System design to achieve high reliability as a financial platform Backend development that balances performance and stability Design with a view of the entire system Architecture design Middleware selection Design of integration with infrastructure Continuous improvement Performance improvement of microservices Monitoring Alert improvement Failure analysis 高信頼な金融基盤の設計 金融プラットフォームとして高い信頼性を実現するシステム設計 パフォーマンスと安定性を両立するバックエンド開発 システム全体を見据えた設計 アーキテクチャ設計 ミドルウェア選定 インフラとの連携設計 継続的な改善 マイクロサービスの性能改善 モニタリング アラート改善 障害分析 Attractiveness of This Position・本ポジションの魅力 [Tech Challenges] In this position, you will face technical challenges unique to financial systems. Highly available and highly reliable system design Modernization utilizing legacy assets Performance design to support high-volume transactions Architecture design anticipating future scalability Opportunity to be involved in the modernization of financial infrastructure While maintaining the reliability of the financial system cultivated over many years, we will advance architecture improvements and feature expansions. Mission-critical system development Because it is a financial system where downtime is not permitted, you can experience design and implementation that consider high availability, performance, and fault tolerance. Ability to design the entire system You will be involved in the design of not only implementation but also: Architecture Middleware Infrastructure Scale unique to the PayPay Group You will be involved in system development that supports the financial services of the entire PayPay Group, not just the bank itself. 【Tech Challenges】 このポジションでは、金融システムならではの技術課題に向き合います。 高可用・高信頼なシステム設計 レガシー資産を活かしたモダナイゼーション 大量トランザクションを支える性能設計 将来の拡張性を見据えたアーキテクチャ設計 金融基盤のモダナイゼーションに携われる 長年培われた金融システムの信頼性を維持しながら、アーキテクチャの改善や機能拡張を進めます。 ミッションクリティカルなシステム開発 停止が許されない金融システムだからこそ、高可用性・性能・耐障害性を考慮した設計・実装を経験できます。 システム全体を設計できる 実装だけでなく、 アーキテクチャ ミドルウェア インフラ まで含めた設計に携われます。 PayPayグループならではのスケール 銀行単体ではなく、PayPayグループ全体の金融サービスを支えるシステム開発に携われます。 Project Examples・プロジェクト事例 Application development for new services and improvements to existing services: ・Account opening linked with LINE, inquiry chat ・PayPay mini-app integration ・Expansion of cardless ATM usage ・Improvement of account opening processes ・Improvement of various loan services, etc. 新サービスから既存サービスの改善におけるアプリケーション開発を行います。 ・LINE連携した口座開設、問い合わせチャット ・PayPayミニアプリ連携 ・カードレスATMの利用拡大 ・口座開設処理の改善 ・各種ローンサービスの改善 など Required Experience/Skills・必要な経験/スキル 3-5 years of backend development experience Practical experience in C or Java. Excellent skills in other common programming languages Understanding of data structures, algorithms, and the basics of object-oriented programming Schema design in DB (RDB, NoSQL, etc.) and efficient query creation Experience in web application development and tuning, and development with security considerations Japanese (Native or equivalent to JLPT N1 or N2 proficiency) 3~5年のバックエンド開発経験 C、または、Javaの実務経験。その他一般的なプログラミング言語の優れたスキル データ構造、アルゴリズム、オブジェクト思考プログラミングの基礎を理解していること DB（RDB、NoSQL など）におけるスキーマ設計、効率的なクエリ作成 Webアプリケーション開発・チューニング経験、セキュリティを考慮した開発 日本語（母国語もしくは日本語能力試験N1またN2同等レベル） Desired Experience/Skills・あると望ましい経験/スキル Development experience in the financial industry Experience implementing platform components such as RESTful API, Pub/Sub systems, database clients Development experience using AWS services Experience in system design, developing applications/web products handling large transactions, and applications/web products requiring scalability Development experience in both C and Java Experience with microservices English (Business level conversational proficiency) 金融業界での開発経験 RESTful API、Pub/Subシステム、データベースクライアントなどのプラットフォームコンポーネントの実装経験 AWSサービスを使った開発経験 システム設計、大量トランザクションを扱うアプリ／Webプロダクト、スケーラビリティを必要とするアプリ／Webプロダクトの開発経験 CとJavaの両方の開発経験 マイクロサービスの経験 英語（ビジネスレベルでの会話が可能なレベル） Desired Candidate Profile・求める人物像 Individuals who can logically structure their thoughts and communicate effectively Individuals who can approach everything with a strong sense of ownership ものごとを論理的に組み立ててコミュニケーションが取れる方 当事者意識をもって何事も取り組むことができる方 PayPay 5 senses Please refer PayPay 5 senses to learn what we value at work Related position in PayPay Group PayPay Card: Backend Engineer What is differences with PayPay (Please choose the position that best aligns with your career goals, as we do not allow simultaneous applications for two positions） Working Conditions Employment Status Full Time Office Location Hybrid Workstyle ※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives. LIFE in JAPAN FACTBOOK Work Hours Super Flex Time (No Core Time) In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break) Holidays Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days Paid leave Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire) Personal leave (5 days each year, granted proportionally according to the month of employment） ＊PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc. Salary Annual salary paid in 12 installments (monthly) Based on skills, experience, and abilities Reviewed once a year Late overtime allowance ※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you Benefits Social Insurance (health insurance, employee pension, employment insurance and compensation insurance) 401K Translation/Interpretation support VISA sponsor + Relocation support 待遇・条件 雇用形態 正社員 勤務地 Hybrid Workstyle ※所属組織のルールおよび業務指示に応じて出社対応頂きます。 勤務時間 スーパーフレックス制（コアタイム無し） 原則：午前9時～午後5時45分（実働7時間45分＋休憩時間 1時間） 休日 土日祝日、年末年始および会社指定日 休暇（法定 休暇 および会社 福利厚生） 年次有給休暇(初年度14日間、入社月に応じて按分付与。入社日から使用可） パーソナル休暇（毎年度５日間付与/初年度入社月により3日間もしくは5日間付与） ※PayPay独自の特別有給休暇制度で、本人/家族/ペットなどの病気/ケガ/通院付き添い等にご使用頂けます。 給与 年俸制（一部固定残業代含む） 経験、スキル、業績、貢献度に応じ当社規定により決定 毎年1回見直し 時間外勤務手当、深夜勤務手当有 ※給与支給について、一部をPayPayアカウントで受け取ることが可能です（給与デジタル支払いに対応） ベネフィット 社会保険（健康保険、厚生年金、雇用保険、労災保険） 企業型確定拠出年金制度 語学学習のサポート Other Information: PayPay Inside-Out (Corporate Blog) /JP PayPay Inside-out (Corporate Blog) /ENG PayPay Product Blog /JP PayPay Product Blog /ENG PIVOT動画：【PayPayが仕掛ける金融革命】

About PayPay PayPay is a FinTech company that has grown to over 75M (as of August 2026) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries. OUR VISION IS UNLIMITED_ We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. Job Description PayPay is looking for a Backend Engineer to work on our payment system to deliver the best payment experience for our customers. AI-First Culture at PayPay At PayPay, we believe that the future of software development is AI-augmented. Every engineer is expected to actively leverage AI tools for code reviews, testing, documentation, debugging, and productivity. AI is not optional — it is a mandatory part of our daily engineering workflow. Candidates must demonstrate both experience and mindset in utilizing AI effectively to deliver high-quality systems faster and better. Main Responsibilities Design large-scale systems with high complexity to support our high throughput applications. Understand how to leverage infrastructure for solving such large-scale problems. Develop tools and contribute to open source wherever possible. Adopt problem solving as a way of life – always go to root cause! Support the code you write in production. Leverage AI/LLM-based tools for code development, reviews, testing, and documentation in daily workflows. Tech Stack We select the best combination of tech at times. | Java, Kotlin, Scala | Spring Boot, JUnit, Resilience4j, Feign | MySQL/AuoraDB, DynamoDB, ELK, Kafka, Redis, TiDB | Docker, Kubernetes, ArgoCD, AWS, GCP | GitHub, IntelliJ, Gradle, Maven, npm/yarn, Flyway, Jenkins, snyk, | Bigquery, Kibana, Spark | PlantUML, draw.io, miro.com | Slack, Zoom Qualifications 4+ years of experience in using Java under professional environment, or if you are non-Java user, excellent skills in generalized programming languages, such as Scala, Python, and Go. Interest and ability to learn other coding languages as needed. Experience with NoSQL databases and distributed cache. Strong fundamentals in data structures, algorithms and object-oriented programming. In-depth understanding of concurrency and distributed computing. Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development. Business level of English or Japanese. Hands-on experience with AI/LLM tools (e.g., ChatGPT, GitHub Copilot, Gemini, CodeWhisperer, or similar) in professional software development. Preferred Qualifications Experience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database clients. Experience with AWS services. Experience in working for system development in finance, payment, or similar industries. Experience in system design, development of web systems which handle massive amount of transactions or require scalability. Language ability in Japanese and English is a plus (we have a professional translator but it is nice to have language skills). Experience in microservices. Proven track record of integrating AI-assisted development into system design and delivery. Contributions to AI-related open-source projects or automation of workflows with AI is a plus. PayPay 5 senses Please refer PayPay 5 senses to learn what we value at work. Related position in PayPay Group PayPay Card: Backend Engineer What is differences with PayPay (Please choose the position that best aligns with your career goals, as we do not allow simultaneous applications for two positions） Working Conditions Employment Status Full Time Office Location Hybrid Workstyle ※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives. LIFE in JAPAN FACTBOOK Work Hours Super Flex Time (No Core Time) In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break) Holidays Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days Paid leave Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire) Personal leave (5 days each year, granted proportionally according to the month of employment） ＊PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc. Salary Annual salary paid in 12 installments (monthly) Based on skills, experience, and abilities Reviewed once a year Late overtime allowance ※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you Benefits Social Insurance (health insurance, employee pension, employment insurance and compensation insurance) 401K Translation/Interpretation support VISA sponsor + Relocation support Other Information: PayPay Inside-Out (Corporate Blog) /JP PayPay Inside-out (Corporate Blog) /ENG PayPay Product Blog /JP PayPay Product Blog /ENG PIVOT動画：【PayPayが仕掛ける金融革命】

About PayPay PayPay is a FinTech company that has grown to over 75M (as of August 2026) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries. OUR VISION IS UNLIMITED_ We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. Team Missions Serving as an autonomous QA organization in Product Group. To improve the overall quality of PayPay products and services To develop PayPay quality standards and best practices To gain trust in quality from PayPay Users and Merchants Job Description Main Responsibilities Analyze testing requirements to develop comprehensive test scenarios for various test levels. Design and create detailed test cases that validate conformance to functional and non-functional requirements. Prepare and manage essential test data, tools, and environments for test execution. Execute test cases and scripts, meticulously documenting results. Log, track, and verify defects, ensuring accurate documentation and timely resolution. Collect, organize, and analyze test results to provide thorough reports on all QA activities. Analyze testing outcomes and recommend effective solutions for identified issues. Maintain and update comprehensive test documentation, ensuring coverage for new features and robust regression testing. Support knowledge management and foster collaboration by actively participating in testing discussions and contributing to continuous improvement through lessons learned. Act as a Subject Matter Expert (SME) for designated modules, providing critical domain knowledge and support to the QA team. Provide guidance and support to junior QA engineers, including onboarding and training. Leverage AI tools such as NotebookLM, Gemini, Cursor AI, GitHub Copilot, and OpenAI APIs to accelerate test case design, automation, and exploratory testing. Apply prompt engineering and RAG (Retrieval-Augmented Generation) techniques to validate LLM-driven applications, ensuring accuracy, reliability, and robustness. Work with OpenAI keys, LLM models, and MCP server integrations, automating API-based interactions and securing AI workflows. Test and monitor AI/ML systems for issues such as bias, drift, hallucinations, and performance deviations. Qualifications Minimum 5+ years of experience in developing, executing, and maintaining automated test cases for mobile applications, web applications, and/or APIs. Proven professional experience with at least one of the following automation frameworks/tools: Appium (for mobile), Selenium (for web), or Rest-Assured (for APIs). Proficient in utilizing Cucumber for defining and executing test cases. Well-versed in Continuous Integration/Continuous Deployment (CI/CD) tools such as Jenkins, Bitrise, or similar platforms. Basic understanding of microservices architecture and its associated testing challenges. Strong ability to analyze technical requirements, design comprehensive test strategies, and create detailed, effective test cases. Exceptional analytical and problem-solving skills, coupled with a meticulous attention to detail. Excellent communication skills, a team-oriented mindset, and the ability to work effectively both independently and collaboratively. Hands-on experience with AI productivity tools (NotebookLM, Gemini, Cursor AI, GitHub Copilot). Knowledge of OpenAI API usage, key management, embeddings, and LLM integration workflows. Familiarity with MCP server concepts and their integration in test automation pipelines. Understanding of AI system validation techniques, including testing for bias, hallucinations, drift, and robustness. Preferred Qualifications ISTQB or an equivalent QA certification. Experience working in Agile or other fast-paced development environments. Familiarity with the financial or payments domain is highly desirable. Experience in proposing and standardizing QA processes, with a proven ability to collaborate effectively with cross-functional teams. Experience in designing and executing performance tests using tools such as Gatling, wrk, or JMeter. Familiarity with Docker and Kubernetes for containerization and orchestration. Experience with bash or other command-line interface (CLI) scripting. Coding experience in building web or mobile-based applications. A strong sense of curiosity and a passion for continuously learning new technologies are definite plusses! PayPay 5 senses Please refer PayPay 5 senses to learn what we value at work Working Conditions Employment Status Full Time Office Location Hybrid Workstyle ※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives. LIFE in JAPAN FACTBOOK Work Hours Super Flex Time (No Core Time) In principle, 9:00am-5:45pm (actual working hours: 7h45m + 1h break) Holidays Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days Paid leave Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire) Personal leave (5 days each year, granted proportionally according to the month of employment) ＊PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc. Salary Annual salary paid in 12 installments (monthly) Based on skills, experience, and abilities Reviewed once a year Late overtime allowance ※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you Benefits Social Insurance (health insurance, employee pension, employment insurance and compensation insurance) 401K Translation/Interpretation support VISA sponsor + Relocation support Other Information: PayPay Inside-Out (Corporate Blog) /JP PayPay Inside-out (Corporate Blog) /ENG PayPay Product Blog /JP PayPay Product Blog /ENG PIVOT動画：【PayPayが仕掛ける金融革命】

About PayPay PayPay is a FinTech company that has grown to over 75M (as of August 2026) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries. OUR VISION IS UNLIMITED_ We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion. ※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation. Job Description The Data Infrastructure team builds and operates the platform that powers data workloads across PayPay Group. We own the Databricks Lakehouse environment, the cloud infrastructure underneath it, and the tooling that keeps it running — from workspace provisioning and access governance to monitoring, alerting, and incident response. This role sits at the intersection of cloud infrastructure and data platform engineering. You'll design and build AWS infrastructure using Terraform, support Databricks workspace and account operations, and improve platform reliability through SRE practices. Day to day, that means writing IaC, responding to operational issues, shipping platform services, and working directly with data engineers across the group to keep their workloads running smoothly. We're looking for someone who can carry projects independently, thinks about systems beyond the ticket in front of them, and wants to go deeper on data infrastructure as a discipline. You don't need to know Databricks on day one — but you should be comfortable with AWS, Terraform, and the fundamentals of running production infrastructure. Main Responsibilities Design, build, and manage AWS cloud infrastructure using Terraform, following IaC and GitOps practices Operate and improve the Databricks Lakehouse platform — workspace provisioning, configuration management, and day-to-day reliability Build and maintain platform services and tooling that support data engineers across PayPay Group companies Strengthen system reliability through SRE practices: monitoring, alerting, dashboarding, and incident response Implement and enforce data governance and security controls in line with compliance requirements Collaborate with data engineering teams on infrastructure needs for their projects and workloads Participate in on-call rotation and operational support for the data platform Qualifications 3+ years of experience in infrastructure or platform engineering Hands-on experience with Terraform and Infrastructure as Code workflows Working knowledge of AWS — IAM, VPC, S3, EC2, and multi-account setups Familiarity with CI/CD pipelines (GitHub Actions, Jenkins, or equivalent) Experience with monitoring and observability tools (Prometheus, Grafana, or similar) Scripting ability in Python and/or Shell Solid fundamentals in Linux/Unix, networking (DNS, HTTP, basic OSI model), and security best practices Preferred Qualifications Experience with Databricks, EMR, or other data platform technologies Exposure to Kubernetes and GitOps tooling (EKS, ArgoCD) Familiarity with Kafka or event-based data ingestion patterns (CDC, batch consumption) Familiarity with workflow orchestration tools (Airflow, Dagster, Prefect) Experience with Spark, Hadoop, or large-scale data processing frameworks Background in platform engineering — building internal tooling, developer experience, or self-service infrastructure PayPay 5 senses Please refer PayPay 5 senses to learn what we value at work. Working Conditions Employment Status Full Time Office Location Hybrid Workstyle ※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives. LIFE in JAPAN FACTBOOK Work Hours Super Flex Time (No Core Time) In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break) Holidays Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days Paid leave Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire) Personal leave (5 days each year, granted proportionally according to the month of employment） ＊PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc. Salary Annual salary paid in 12 installments (monthly) Based on skills, experience, and abilities Reviewed once a year Late overtime allowance ※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you Benefits Social Insurance (health insurance, employee pension, employment insurance and compensation insurance) 401K Translation/Interpretation support VISA sponsor + Relocation support Other Information: PayPay Inside-Out (Corporate Blog) /JP PayPay Inside-out (Corporate Blog) /ENG PayPay Product Blog /JP PayPay Product Blog /ENG PIVOT動画：【PayPayが仕掛ける金融革命】