{"id":90053,"url":"https://alion.io/job/paypay-backend-engineer-2","title":"Backend Engineer","company":{"id":328,"name":"PayPay","domain":"paypay.ne.jp","url":"https://alion.io/company/paypay","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"D","score":53,"open_postings":37,"ghost_share":0.784,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-17T05:46:00Z"}},"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":"inferred","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":"AWS","optional":false},{"name":"ChatGPT","optional":false},{"name":"Copilot","optional":false},{"name":"Gemini","optional":false},{"name":"GitHub","optional":false},{"name":"Java","optional":false},{"name":"LLM","optional":false},{"name":"Python","optional":false},{"name":"Scala","optional":false},{"name":"Apache Kafka","optional":true},{"name":"ArgoCD","optional":true},{"name":"BigQuery","optional":true},{"name":"Docker","optional":true},{"name":"Draw.io","optional":true},{"name":"DynamoDB","optional":true},{"name":"Flyway","optional":true},{"name":"GCP","optional":true},{"name":"Google BigQuery","optional":true},{"name":"Gradle","optional":true},{"name":"JavaScript","optional":true},{"name":"Jenkins","optional":true},{"name":"JUnit","optional":true},{"name":"Kibana","optional":true},{"name":"Kotlin","optional":true},{"name":"Kubernetes","optional":true},{"name":"Maven","optional":true},{"name":"MySQL","optional":true},{"name":"npm","optional":true},{"name":"Redis","optional":true},{"name":"Resilience4j","optional":true},{"name":"Slack","optional":true},{"name":"Spark","optional":true},{"name":"Spring Boot","optional":true},{"name":"TiDB","optional":true}],"status":"live","first_seen_at":"2025-10-20T07:52:05Z","employer_posted_date":"2026-09-10","last_verified_at":"2026-10-17T10:58:19Z","board_verified":true,"closed_at":null,"days_open":362,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":361},"description":"About PayPay\nPayPay 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.\nOUR VISION IS UNLIMITED_\nWe 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.\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\nPayPay is looking for a Backend Engineer to work on our payment system to deliver the best payment experience for our customers.\nAI-First Culture at PayPay\nAt 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.\nMain Responsibilities\nDesign large-scale systems with high complexity to support our high throughput applications.\nUnderstand how to leverage infrastructure for solving such large-scale problems.\nDevelop tools and contribute to open source wherever possible.\nAdopt problem solving as a way of life - always go to root cause! Support the code you write in production.\nLeverage AI/LLM-based tools for code development, reviews, testing, and documentation in daily workflows.\nTech Stack\nWe select the best combination of tech at times.\n| Java, Kotlin, Scala\n| Spring Boot, JUnit, Resilience4j, Feign\n| MySQL/AuoraDB, DynamoDB, ELK, Kafka, Redis, TiDB\n| Docker, Kubernetes, ArgoCD, AWS, GCP\n| GitHub, IntelliJ, Gradle, Maven, npm/yarn, Flyway, Jenkins, snyk,\n| Bigquery, Kibana, Spark\n| PlantUML, draw.io, miro.com\n| Slack, Zoom\nQualifications\n4+ 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.\nInterest and ability to learn other coding languages as needed.\nExperience with NoSQL databases and 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 of English or Japanese.\nHands-on experience with AI/LLM tools (e.g., ChatGPT, GitHub Copilot, Gemini, CodeWhisperer, or similar) in professional software development.\nPreferred Qualifications\nExperience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database clients.\nExperience with AWS services.\nExperience in working for system development in finance, payment, or similar industries.\nExperience in system design, development of web systems which handle massive amount of transactions or require scalability.\nLanguage ability in Japanese and English is a plus (we have a professional translator but it is nice to have language skills).\nExperience in microservices.\nProven track record of integrating AI-assisted development into system design and delivery.\nContributions to AI-related open-source projects or automation of workflows with AI is a plus.\nPayPay 5 senses\nPlease refer PayPay 5 senses to learn what we value at work.\nRelated position in PayPay Group\nPayPay Card: Backend Engineer \nWhat 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）\nWorking Conditions \nEmployment Status\nFull Time\nOffice Location\nHybrid Workstyle※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives.\n\nLIFE in JAPAN FACTBOOK\n\nWork Hours\nSuper Flex Time (No Core Time)\nIn principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break)\nHolidays\nEvery Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days\n\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'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)\nBased on skills, experience, and abilities\nReviewed once a year\nLate overtime allowance※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you\n\nBenefits\nSocial Insurance (health insurance, employee pension, employment insurance and compensation insurance)\n401K\nTranslation/Interpretation support\nVISA sponsor + Relocation support\nOther Information:\n PayPay Inside-Out (Corporate Blog) /JP\n PayPay Inside-out (Corporate Blog) /ENG\nPayPay Product Blog /JP\nPayPay Product Blog /ENG\n PIVOT動画：PayPayが仕掛ける金融革命","description_format":"text","description_chars":5614,"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":"English","level":"Upper-Intermediate (B2)","optional":false},{"language":"Japanese","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":["401k plan","Annual leave","Health insurance"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":true,"industries":["Payment Processing & Gateways"],"lifecycle":[{"event":"open","at":"2025-10-20T07:52:05Z"}],"visa":[],"liveness":{"score":4,"band":"cold","label":"Long shot","p_open":1,"p_active":0.133,"p_room":0.28,"age_days":361,"expected_fill_days":26,"reasons":["conf:1","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/paypay-backend-engineer-2","json_url":"https://alion.io/job/paypay-backend-engineer-2.json","meta":{"generated_at":"2026-10-17T11:08:06Z","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":14507,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"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":328},"rest":"https://alion.io/mcp/rest/get_company?id=328"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fpaypay-backend-engineer-2"},{"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%2Fpaypay-backend-engineer-2"},{"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%2Fpaypay-backend-engineer-2"},{"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/paypay-backend-engineer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fpaypay-backend-engineer-2"}]}