SENIOR BACKEND PERFORMANCE ENGINEER (EU) - NODE.JS

We're hiring an engineer to build the backend infrastructure behind an exceptionally fast product — one that stays fast regardless of scale. The system is live and growing; your job is to drive latency down across every layer of the stack. This is a high-ownership role: you'll own backend performance across the platform and build custom infrastructure wherever off-the-shelf solutions can't keep up. What You'll Do • Own backend performance across the platform — databases, APIs, queues, and background processing • Design advanced caching and data synchronization systems • Profile production systems and eliminate latency bottlenecks at every layer • Build custom infrastructure where third-party solutions aren't fast enough • Improve scalability while keeping response times low • Work with feature teams to hit performance targets, and continuously benchmark against best-in-class SaaS products What We're Looking For Must have: • 4+ years of backend engineering experience, including 4+ years building and scaling high-traffic production systems • Proven track record of optimizing large-scale backend systems • Deep expertise in Node.js, TypeScript, PostgreSQL, Redis, networking, and distributed systems • Extensive experience with database optimization, caching, asynchronous processing, and API performance • Experience building custom infrastructure instead of relying solely on third-party solutions • Strong computer science fundamentals, algorithms, and systems design knowledge; exceptional engineering standards and attention to detail • Experience building products where latency and scalability were critical to the business Nice to have: • Experience with high-volume messaging or event-driven systems • Experience at a startup or fast-moving product company • Familiarity with performance observability tooling (profilers, tracing, APM)