Job Description
Career Opportunity for a Senior Backend Engineer in Japan!
■ Senior Backend Engineer (TypeScript / Web3)
■ Company Overview
A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.
■ Your Role and Responsibilities
● Take ownership of backend architecture and implementation across multiple products within the company’s ecosystem.
● Design, build, and maintain scalable production APIs and backend services used by customer-facing applications.
● Build and operate high-performance distributed systems capable of serving large user bases and handling significant production traffic reliably.
● Design backend systems with strong focus on scalability, fault tolerance, reliability, and long-term maintainability.
● Build and maintain data pipelines, background workers, asynchronous processing systems, and event-driven architectures.
● Build and maintain blockchain integrations and indexing systems that ingest, process, and serve on-chain data to internal services and user-facing applications.
● Design efficient database schemas, optimize complex queries, and ensure long-term scalability of data storage systems.
● Work across both Web2 and Web3 backend infrastructure, integrating traditional backend systems with blockchain protocols and decentralized infrastructure.
● Diagnose and solve complex production issues, performance bottlenecks, reliability problems, and scaling challenges.
● Build systems with strong observability, monitoring, alerting, and operational tooling.
● Continuously improve backend architecture, deployment pipelines, system reliability, and engineering practices.
● Move quickly, make sound technical decisions independently, and take ownership of delivering production-ready systems.
■ Experience and Qualifications
● Extensive experience building and operating production backend systems in modern engineering environments.
● Strong proficiency in TypeScript and modern backend frameworks (NestJS, Fastify, Express, or similar).
● Strong understanding of backend architecture, API design, service-oriented architecture, and distributed systems design.
● Ability to independently design and deliver complex backend systems with minimal oversight.
Large-Scale Systems Experience
● Proven track record building and operating backend systems serving large numbers of users in production environments.
● Experience designing systems that operate reliably under high traffic, heavy workloads, and demanding production conditions.
Data & Infrastructure
● Deep expertise with PostgreSQL, including schema design, indexing, query optimization, migrations, and production database management.
● Experience building systems that process large amounts of structured or event-driven data.
● Strong understanding of observability, logging, monitoring, and service health management.
Web2 + Web3 Engineering
● Experience building backend systems for modern Web2 applications.
● Experience integrating with blockchain infrastructure, node APIs, smart contracts, or decentralized protocols.
■ Additional Preferred Qualifications
● Experience building backend services in Go.
● Experience with Kafka, NATS, RabbitMQ, or similar messaging systems.
● Experience deploying and operating services using Docker and modern CI/CD pipelines.
● Contributions to open-source backend, infrastructure, or blockchain tooling projects.
● Strong understanding of the DeFi ecosystem and hands-on familiarity with products such as decentralized exchanges, lending protocols, staking systems, bridges, or other on-chain financial infrastructure.
■ Good Reasons to Join
● Join a highly technical startup environment where engineers have significant ownership and direct product impact.
■ Work Location
Tokyo, Japan
Details will be provided during the meeting.