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Senior Backend Engineer

Tokenz One — Japan · Posted ~3 hours ago

Senior

Skills

Backend engineering Production systems System design Distributed systems SQL Reliability engineering English communication Scala Kotlin Rust TypeScript Go Elixir Java

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Summary ✨ AI‑Generated

Join a growing engineering team as a Senior Backend Engineer and own substantial backend systems from requirements through production. You will make architecture decisions and build reliable systems that handle real-world transactions and complex external dependencies. Strong judgment around idempotency, consistency, retries, synchronous versus asynchronous processing, and operational costs is essential. Production experience with a modern backend language and solid SQL fundamentals are required.

Highlights

Own backend systems end to end, from product requirements and architecture through production operations. The role provides substantial technical ownership over systems handling real-world financial transactions and complex external dependencies.

Description

We just raised our Series A, and we're growing the team that builds payment infrastructure for digital-goods businesses. As a Merchant of Record, we take payments, tax, compliance, and subscriptions off our customers' plate, and give them hundreds of payment methods globally. You'll own work end to end — from product requirements to production. Learn the domain, make the design calls, ship systems that move real money. What we're looking for You've shipped and operated substantial backend systems, and owned them end to end.You have strong judgment about IO-bound, upstream-dependent systems: idempotency, consistency, retries, sync vs. async, failure handling, and what it all costs to run.You've worked in production in a backend language — Scala, Kotlin, Rust, TypeScript, Go, Elixir, modern Java, or similar.Solid SQL fundamentals and fluent English.Payments, booking, e-commerce, logistics, or anything else with messy external dependencies is a plus. So is startup experience. The stack Scala and ZIO on the JVM. You don't need prior Scala or ZIO — if you've worked in typed backend systems, you'll ramp up fine. The team You’ll join a team with payments experience, work closely with product and frontend, and help shape a young codebase. We pair on projects, including senior engineers, and share responsibility for production and on-call. Logistics: Tokyo hybrid (~2 days/week in our Kamiyacho office), or remote from CE(S)T through JST time zones.Competitive compensation.English-speaking team. Japanese is not required.