About
A trading evaluation platform, built like infrastructure
The Flex Funded is a simulated proprietary trading evaluation platform. We built it around one constraint: nothing about a trader's balance, equity, or P&L should ever be decided in the browser. Every number a trader sees is a reflection of server-side state — never a client-side estimate.
That constraint shapes the entire architecture, from how the terminal is built to how the execution engine is isolated from the rest of the application. It's also why the platform can stay fast: the interface never waits on trading calculations it was never doing in the first place.
Integrity of state
Account state is authoritative and server-side, always. It's the one rule every other design decision defers to.
Speed without shortcuts
A fast terminal and a slow, correct execution engine aren't in tension — the UI stays fast precisely because it never computes trading logic itself.
Built to grow
Every boundary in the system — frontend, engine, risk rules — is designed so pieces can move to dedicated infrastructure independently.