Principal Backend / Performance / Database Engineer @iClosed

Remote (Pakistan preferred) · Full-time 🧭 About the role iClosed .io is a SaaS platform for sales and marketing teams, scaling to millions of users. This role sits in our Performance Team and owns the performance and scalability of our Node.js/TypeScript backend services and data layer. We believe the biggest gains come from design, not just tuning: matching each store to its access pattern, moving work off the critical path, and drawing service boundaries that scale cleanly. You'll solve the problem in front of you, then shape the architecture so whole classes of problems never come up. This is a senior individual contributor role with no direct reports, high autonomy and significant technical influence. 🔀 How the work splits You'll own performance across three connected areas, with genuine depth expected in both system design and data-layer internals: Design: how a request flows, what runs synchronously, where state lives, and what happens when a dependency is slow. Diagnosis: reading traces, execution plans and metrics to find the real cause rather than the obvious one. Prevention: instrumentation, review standards and regression gates, so issues are caught long before they reach customers. 🎯 What you'll do Lead the design of high-traffic flows end to end, keeping them fast under load and resilient when dependencies fail. Diagnose latency across the full request path using traces, execution plans and metrics. Match each workload to the right data store, and document the