Engineering for Instantaneity: How a Team’s Persistence Transformed Our Trading Platform

Groww's engineering team shares how they reduced trading platform latency through a multi-phase approach spanning observability, architectural simplification, and infrastructure upgrades. Starting with distributed tracing via Honeycomb and custom dashboards, they identified that latency was spread across multiple layers rather than a single bottleneck. Key improvements included consolidating legacy services, reducing order flow hops from 7+ to ~5, migrating message queues (reducing consumer latency from 300ms to 100ms), upgrading databases (commit latency from 11-12ms to 1-2ms), and applying Redis pipelining with Lua scripting. Results include 90% improvement in cash order p99 latency at market open, 97% reduction in producer peak latency, 35% infrastructure cost reduction, and near real-time socket updates. The core lesson: simplification—removing redundant hops and consolidating services—delivered more impact than complex optimization techniques.