Traddy — Real-Time Trading & White-Label

Traddy is a real-time trading platform built on Spring Cloud, with a defining twist: it's designed from the ground up to be operated as a white-label product. A single codebase serves many admins, each with their own branding, their own users, and their own isolated configuration — so the same engineering investment can power an entire network of operators instead of one.

The technical challenge in any trading platform is keeping valuations live. Live stock rates are published continuously by a dedicated rate-publisher service and streamed to clients over WebSockets, while a portfolio processor built on Apache Flink and Kafka recomputes each user's positions as prices move. The result is that a user's portfolio value ticks in real time, driven by a stream-processing pipeline rather than expensive on-demand recalculation or constant polling.

Under the hood, the services — gateway, auth, client, back-office, portfolio processor and rate publisher — are discovered through Eureka and communicate over RabbitMQ, with WebFlux providing a reactive, non-blocking foundation well suited to streaming workloads. This reactive design lets a single instance handle many concurrent live connections without a thread-per-connection blow-up.

The multi-admin variant is where Traddy gets genuinely interesting as a business. It adds a white-label layer on top of the core, including an automated APK generator that builds a branded Android app per tenant. Onboarding a new operator — logo, theme, configuration and a shippable mobile app — happens without touching or forking the core platform.

That separation between core and tenant is the whole point: features, fixes and performance improvements made once flow to every operator at the same time, while each operator's brand and data stay cleanly isolated. It's the difference between maintaining one platform and maintaining a dozen diverging copies of it.