Fintech
Scaling a Fintech Trading Platform to 10k Concurrent Traders
Re-architected a legacy trading app into a low-latency platform handling 10k+ concurrent traders.
Dashboard mockup · Velocity Markets92ms
Order latency
-88%
10,400
Concurrent users
+766%
99.98%
Uptime
+
+3.1x
Trade volume
The Challenge
A fast-growing brokerage was losing users to lag and downtime during peak market hours. Their monolith could not scale past 1,200 concurrent users and order execution routinely exceeded 800ms.
The Solution
We re-architected the core into event-driven microservices with a websocket gateway, an in-memory matching layer and horizontal auto-scaling. A new React front-end delivered real-time charts and sub-second order flow.
The Tech Stack
Next.jsNode.jsRedisKafkaPostgreSQLKubernetesWebSockets
“PyTech felt like an extension of our own team — senior, fast and outcome-obsessed.”
— Velocity Markets
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