Backend Engineer
We're looking for a Backend Engineer focused on designing and building scalable technical solutions. This mid level role requires 3+ years of relevant experience.
About Us
In partnership with Sony and SBI — two of Japan's largest companies — we are building the infrastructure to bring the world's assets on-chain: Strium , a next-generation DeFi L1 powered by a fully on-chain orderbook exchange, and Startale App , a consumer super-app. Distributed across Tokyo, New York, and Singapore; English-operating; built to a world-class standard.
About the Role
We are looking for a Senior Backend Engineer to take ownership of the backend systems powering Startale App and other products across the Startale ecosystem.
This is a senior, hands-on engineering role for someone who can own complex backend systems end-to-end - from designing APIs and backend services, to building scalable data pipelines, managing databases, integrating blockchain infrastructure, and operating production systems under real-world load.
We are looking for an engineer who thrives in a startup environment and is comfortable taking responsibility for any part of the backend stack depending on what the product needs. One month you may be building user-facing APIs, another month designing blockchain indexers, optimizing database performance, improving system reliability, or architecting entirely new backend services from scratch.
Most importantly, we are looking for someone who has previously built and operated large-scale production systems serving real users at meaningful scale . You should have firsthand experience designing systems that handle high traffic, large datasets, reliability challenges, and the operational complexity that comes with running critical backend infrastructure in production.
You should be excited by solving difficult engineering problems, building systems that scale, and owning critical infrastructure with a high degree of autonomy.
You will work closely with product, infrastructure, and protocol teams to build reliable systems that power seamless user experiences across both traditional and blockchain-based applications.
Because our core product is a Web3 wallet, we highly value engineers who understand how decentralized applications work in practice — not just at the protocol level, but also from the perspective of real-world user interactions with wallets, DeFi protocols, and blockchain-based financial systems.
Key Responsibilities
Posted July 15, 2026