{"id":768852,"url":"https://alion.io/job/paypaycard-senior-backend-engineer","title":"Senior Backend Engineer","company":{"id":685457,"name":"PayPay Card","domain":"paypaycard.com","url":"https://alion.io/company/paypaycard","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"C","score":55,"open_postings":24,"ghost_share":0.75,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-11-01T06:10:25Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon CloudWatch","optional":false},{"name":"Amazon ECS","optional":false},{"name":"AWS","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"CloudFormation","optional":false},{"name":"Confluence","optional":false},{"name":"Docker","optional":false},{"name":"GitHub","optional":false},{"name":"Gradle","optional":false},{"name":"Java","optional":false},{"name":"Jira","optional":false},{"name":"JUnit","optional":false},{"name":"Kotlin","optional":false},{"name":"Miro","optional":false},{"name":"Mockito","optional":false},{"name":"Scala","optional":false},{"name":"Slack","optional":false},{"name":"Spring Boot","optional":false},{"name":"gRPC","optional":true},{"name":"Rest API","optional":true}],"status":"live","first_seen_at":"2024-02-22T04:53:15Z","employer_posted_date":"2026-08-13","last_verified_at":"2026-11-01T11:28:21Z","board_verified":true,"closed_at":null,"days_open":983,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":983},"description":"About PayPay Card\nPayPay Card Corporation was established in 2021 to provide users a FinTech service that is more accessible and convenient compared to previous credit cards and credit services, by integrating with the PayPay payment platform, which has surpassed 75 million users since its launch (as of August 2026).\nWe are looking for people who are passionate about refining our products at an overwhelming speed that other companies cannot match, as well as professionals who are interested in promoting the spread of cashless payments in Japan and the use of these payments as a financial life platform. Let us work together to create new value for users.\n※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation.\n\nJob Description / 業務について\nWe are looking for senior backend engineers to build, or rebuild, rock solid services with a laser focus on scalability and maintainability. \nPayPay Card aims at revolutionizing the credit card industry, making payment easier than ever, from two different angles:\nBring the credit card experience to the next level: we have many functionalities in the pipe to improve our product, not to mention the integration into the PayPay ecosystem as PayPay Card is part of the PayPay Group.\n(Re-)architect our systems landscape: we want to reassess and fix the behind-the-scenes to power a top-notch user experience. It is bundled with difficult design challenges to solve: we simply want to get it right.\nAs a fast-paced company leading the payments industry, we need our engineers to be versatile and enthusiastic to take on new challenges in order to stay at the forefront. Indeed, we strive for continuous improvement within our systems as well as outside our systems. Additionally, we value communication, to smoothly cooperate with other teams, and inclusivity, to efficiently navigate in a multicultural environment.\n私たちは、スケーラビリティ（拡張性）とメンテナビリティ（保守性）に徹底的にこだわり、極めて堅牢なサービスを構築、あるいは再構築していただけるシニアバックエンドエンジニアを募集しています。 \nPayPayカードは、これまでにない最高のユーザー決済体験を提供することを目指し、次の2つのアプローチからクレジットカード業界に革命を起こそうとしています。 \nクレジットカード体験を次のレベルへと進化させる：プロダクトの体験向上や機能拡張のために、数多くの開発ロードマップが控えています。また、PayPayグループの一員として、「PayPayエコシステム」とのシームレスな統合・連携も強力に推進しています。\nシステムアーキテクチャの再構築：最高のユーザー体験を裏側から支えるために、現在のシステム構造を再評価し、根本から最適化（刷新）したいと考えています。解決すべき技術的難題は非常に多いですが、私たちは小手先の修正ではなく、アーキテクチャとして「あるべき姿」を愚直に実現することを目指しています。 \n業界をリードする圧倒的なスピード感の中で、常に最前線に立ち続けるために、エンジニアには領域にとらわれない柔軟性と、新しい挑戦に意欲的に取り組む姿勢が求められます。私たちはシステムの内外を問わず、絶え間ない改善を追求しています。また、他チームと円滑に連携するためのコミュニケーション力や、グローバルな環境で最大のパフォーマンスを発揮するための多様性を重視しています。\nMain Responsibilities / 具体的な業務内容\nDesign, support the implementation and deliver large scale, and complex, systems\nManage teams stakeholders such as product managers or frontend engineers but also other team leads or non-tech stakeholders.\nLeverage the infrastructure to solve such large scale problems.\nActs as a gatekeeper to the team quality standard\nTriage, debug and resolve product issues or other incoming inquiries\nMentor other team members and saveguard the team quality standards\n大規模かつ複雑なシステムの設計、および実装からデリバリーまでの主導・サポート\nプロダクトマネージャーやフロントエンドエンジニア、他チームのリード、非エンジニアを含む多様なステークホルダーとの調整・マネジメント\n大規模な課題を解決するために、インフラ基盤をどのように活用・レバレッジすべきかの検証と実践\nチームにおける品質水準の維持と、ゲートキーパーとしての役割の遂行\nプロダクトにおける不具合や外部からの問い合わせトラブルに対する、トリアージ、デバッグ、および原因究明と解決\nチームメンバーへのメンタリング、およびチーム全体の開発品質の保護・担保\nTech Stack\nWe currently work with\nBack-end services: \nMain implementations are in Spring Boot, with a mix of Java 11/Spring Boot 2 and Java 17/Spring Boot 3. \nSome legacy systems are written in Java EE.\nTesting is done with JUnit and Mockito\nDeployment relies on AWS ECS \nCI/CD is handled by AWS CodePipeline \nInfrastructure \nAll our services run in AWS\nInfrastructure is managed by AWS CloudFormation\nAWS CloudWatch is used for observability\nCoding environment: GitHub, IntelliJ, Gradle\nDocumentation & Project management: Confluence, Miro, JIRA\nCommunication: Slack, Zoom, Office 365\nPlease note that PayPay Card is challenging its current architecture, potentially introducing new technologies and/or deprecating existing ones.\n現在は以下の技術を使用しています。\nバックエンドサービス：\nメイン実装：Spring Boot（Java 11 / Spring Boot 2、および Java 17 / Spring Boot 3 の混在）\n一部のレガシーシステム：Java EE\nテスト：JUnit, Mockito\nインフラ・デプロイ：AWS ECS / Docker\nCI/CD：AWS CodePipeline\nインフラ・共通基盤\nクラウド環境：すべてのサービスを AWS 上で構築・運用 \nインフラ管理：AWS CloudFormation\nオブザーバビリティ：AWS CloudWatch\n開発ツール： GitHub, IntelliJ, Gradle\nプロジェクト管理・ドキュメント： Jira, Miro, Confluence\nコミュニケーション： Slack, Zoom, Office 365\n※ PayPayカードでは既存のアーキテクチャ刷新（リアーキテクト）に取り組んでいるため、プロダクトの成長に合わせて新しい技術の積極的な導入や既存技術のリプレイスを柔軟に推進していきます。\nRequired Qualifications / 必要な経験/スキル\n\nExperience in any OOP based language e.g Kotlin, Java, C#, Scala etc.\nExperience with RDBMS and NoSQL databases, along with distributed cache.\nStrong fundamentals in data structures, algorithms and object oriented programming.\nIn-depth understanding of concurrency and distributed computing.\nDegree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development.\nBusiness level proficiency in English or Japanese\nKotlin、Java、C#、Scalaなどのオブジェクト指向言語の経験\nRDBMS、NoSQLデータベース、および分散キャッシュの経験\nデータ構造、アルゴリズム、およびオブジェクト指向プログラミングに関する強固な基礎知識\n並行処理および分散コンピューティングに関する深い理解\nコンピュータエンジニアリングまたはコンピュータサイエンスの学位、あるいはSaaSプラットフォーム開発における5年以上の同等実務経験\nビジネスレベルの日本語または英語力\nPreferred Qualifications / あると望ましい経験/スキル\n\nExperience with Java/Spring Boot framework\nExperience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database Clients. \nExperience in system design for high traffic application with scalability in mind \nExperience with microservices & event-driven architecture \nExperience gRPC communication design and implementation\nExperience in a multicultural environment\nJapanese conversational proficiency is a plus\nドメイン駆動設計（DDD）に関する知識\nJavaおよびSpring Bootの経験\ngRPCおよびKafkaの開発経験\nグローバル環境での業務経験\n他部門とのステークホルダーマネジメントの経験\nWorking Conditions\nEmployment Status\nFull Time\nOffice Location\nHybrid Workstyle (flexible working style including Remote and office)※ You will be expected to work both in the office and remotely, in alignment with organizational guidelines and team objectives.\n\nLIFE in JAPAN FACTBOOK\nWork Hours\nFull Flex Time (No Core Time)\nIn principle, 9:00am ~ 5:45pm (actual working hours: 7h45m + 1h break)\nHolidays\nEvery Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days\nPaid leave\nAnnual 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)\nPersonal leave (5 days each year, granted proportionally according to the month of employment)＊PayPay Group'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.\n\nSalary\nAnnual salary paid in 12 installments (monthly)\nReviewed once a year\nOvertime allowance, Late overtime allowance, Commuting and transportation expenses\nBenefits\nSocial Insurance (health insurance, employee pension, employment insurance and compensation insurance)\n401K\nOther Information\n PayPay Inside-Out (Corporate Blog)JP\nENG\n\nRecruiting FACTBOOK for PayPay Card JP","description_format":"text","description_chars":7140,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[{"language":"Japanese","level":"Advanced (C1)","optional":false},{"language":"English","level":"Advanced (C1)","optional":false}]},"benefits":["401k plan","Annual leave","Flexible schedule","Health insurance"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Cards & Card Issuing","Payment Processing & Gateways"],"lifecycle":[{"event":"open","at":"2026-09-11T20:56:32Z"}],"visa":[],"liveness":{"score":4,"band":"cold","label":"Long shot","p_open":1,"p_active":0.146,"p_room":0.28,"age_days":983,"expected_fill_days":28,"reasons":["conf:2","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-11-01T06:10:25Z"},"pay":null,"html_url":"https://alion.io/job/paypaycard-senior-backend-engineer","json_url":"https://alion.io/job/paypaycard-senior-backend-engineer.json","meta":{"generated_at":"2026-11-01T13:41:15Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":20941,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-02T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":685457},"rest":"https://alion.io/mcp/rest/get_company?id=685457"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fpaypaycard-senior-backend-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fpaypaycard-senior-backend-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fpaypaycard-senior-backend-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/paypaycard-senior-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fpaypaycard-senior-backend-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":768852}},{"tool":"search_jobs","arguments":{"company":"paypaycard.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":768852},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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