{"id":1674134,"url":"https://alion.io/job/tokenz-fintech-japan-backend-engineer","title":"Backend Engineer","company":{"id":3782079,"name":"Tokenz# FinTech# Japan","domain":"tokenz.one","url":"https://alion.io/company/tokenz-fintech-japan","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"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":["Tokyo, Japan"],"countries":["JP"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":45000,"max_usd":96000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":13},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Go","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Rust","optional":false},{"name":"Scala","optional":false},{"name":"SQL","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-10-02T07:33:09Z","employer_posted_date":null,"last_verified_at":"2026-10-02T07:33:09Z","board_verified":false,"closed_at":null,"days_open":13,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":13},"description":"About Tokenz\nTokenz is a Merchant of Record for businesses selling digital goods. We handle checkout, payments, tax, compliance, subscriptions, and the infrastructure behind them so our customers can focus on building their products. Our platform gives merchants access to more than 100 payment methods globally without taking on the tax, accounting, and compliance burden themselves.\nWe recently raised our Series A and are growing our engineering team. We’re looking for a Senior Backend Engineer who enjoys understanding complex domains, making thoughtful technical decisions, and owning work from product requirements through production.\nAbout the role\nYou’ll work across our backend, building features and systems where correctness has real consequences. Recent and ongoing projects include subscriptions, one-click purchases, payment-provider fallbacks, redemption codes, consumer dashboards, and merchant tooling.\nOur backend is a JVM-based monolith built with Scala and ZIO. Prior Scala or ZIO experience is not required, but experience with typed backend systems and asynchronous programming provides a strong foundation for learning our stack.\nAs a senior engineer, you’ll take a product requirements document, clarify the domain and constraints, evaluate trade-offs, and deliver production-quality software. You’ll have meaningful ownership and support from teammates with payments experience. We pair on projects, including at the senior level, to share context and work through difficult decisions.\nMain responsibilities\nOwn features end to end. Work closely with product and frontend engineers to shape requirements, design solutions, implement them, and support them in production.\nModel complex business domains. Design schemas and data access patterns with attention to indexing, auditability, transactional workloads, analytics, and future consumers.\nDesign APIs around complete user journeys. Define clear failure behavior, recovery paths, and idempotency where needed, while leaving room for future changes.\nBuild reliable financial and operational flows. Work on money movement, exchange rates, payout ledgers, webhooks, subscriptions, and entitlements.\nMake practical reliability decisions. Reason about consistency, retries, synchronous versus asynchronous work, and dependencies on external systems that can fail.\nOperate what you ship. Investigate production issues, use logs and dashboards to understand behavior, participate in shared on-call, and improve systems after incidents.\nContribute sound engineering judgment. Explain trade-offs, review designs and code, and adapt your approach as new information emerges.\nWhat we’re looking for\nExperience building and shipping production backend systems, with end-to-end ownership of substantial features or projects.\nThe ability to turn product requirements into a sound technical design and carry it through implementation and production delivery.\nStrong judgment in systems that depend on external services, including failure handling, idempotency, consistency, retries, and operational cost.\nExperience in a domain where correctness or coordination with unreliable external systems matters-for example, payments, commerce, bookings, logistics, messaging, or fintech.\nProduction experience with a typed backend language such as Scala, Kotlin, Rust, TypeScript, Go, or modern Java, or comparable backend experience.\nA solid understanding of SQL, relational data modeling, and indexing. PostgreSQL experience is a plus.\nConfidence debugging and operating production systems.\nA pragmatic, collaborative approach: you ask good questions, choose designs that fit the problem, and revise your thinking when constraints change.\nFluent written and spoken English.\nHelpful, but not required\nScala or functional programming experience.\nExperience with ZIO, Cats Effect, Effect-TS, or another effect system.\nKnowledge of Merchant of Record businesses, payments, subscriptions, fintech, tax, or compliance.\nHow we work\nWe’re one backend team working closely with product and frontend. We move quickly and take care with decisions that affect correctness, compliance, and customer trust. Engineers work across the product and build domain knowledge together.\nOn-call is shared across the team. Incidents are infrequent, but responding to production issues and learning from them is part of the role.\nLocation: Tokyo hybrid, with approximately two days per week in the office in Kamiyacho, or remote from time zones between Central European Time (CET/CEST) and Japan Standard Time (JST).\nWorking language: English.","description_format":"text","description_chars":4576,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Media & Entertainment","Content Creation","Digital Media"],"lifecycle":[{"event":"open","at":"2026-10-02T07:43:41Z"}],"visa":[],"liveness":{"score":71,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.793,"p_room":0.9,"age_days":12,"expected_fill_days":23,"reasons":["seen:12","win:mid"],"computed_at":"2026-10-15T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/tokenz-fintech-japan-backend-engineer","json_url":"https://alion.io/job/tokenz-fintech-japan-backend-engineer.json","meta":{"generated_at":"2026-10-15T17:20:06Z","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":26285,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-16T00:00:00Z"}},"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":3782079},"rest":"https://alion.io/mcp/rest/get_company?id=3782079"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftokenz-fintech-japan-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%2Ftokenz-fintech-japan-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%2Ftokenz-fintech-japan-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/tokenz-fintech-japan-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftokenz-fintech-japan-backend-engineer"}]}