Senior Backend Engineer (TypeScript / Web3) at Startale Labs

<h2>About Us</h2> <p>In partnership with <strong>Sony and SBI</strong> — two of Japan's largest companies — we are building the infrastructure to bring the world's assets on-chain: <strong>Strium</strong>, a next-generation DeFi L1 powered by a fully on-chain orderbook exchange, and <strong>Startale App</strong>, a consumer super-app. Distributed across Tokyo, New York, and Singapore; English-operating; built to a world-class standard.</p> <h2><strong>About the Role</strong></h2> <p>We are looking for a <strong>Senior Backend Engineer</strong> to take ownership of the backend systems powering <a href="https://app.startale.com/">StartaleApp</a> and other products across the Startale ecosystem.</p> <p>This is a <strong>senior, hands-on engineering role</strong> for someone who can own <strong>complex backend systems end-to-end</strong> - from designing APIs and backend services, to building scalable data pipelines, managing databases, integrating blockchain infrastructure, and operating production systems under real-world load.</p> <p>We are looking for an engineer who thrives in a <strong>startup environment</strong> and is comfortable taking responsibility for <strong>any part of the backend stack</strong> 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.</p> <p>Most importantly, we are looking for someone who has <strong>previously built and operated large-scale production systems serving real users at meaningful scale</strong>. 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.</p> <p>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 take ownership of live production systems from your first weeks. This role assumes prior hands-on Web3 backend experience — we are not looking for someone to learn the Web3 side on the job.</p> <p>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.</p> <p>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