01 · The challenge
A trading platform needed one backend to run everything - identity and KYC, subscription billing, copy-trading, server provisioning, arbitrage access and customer support - for a base of paying traders.
02 · What I built
A backend integrating fifteen external services into one coherent, authenticated API: payments, messaging, real-time chat, file storage, broker connections and more - covering onboarding, billing, trading features and a full support system.
03 · The hard part
Holding fifteen integrations together without fragility. Payments are activated only through signature-verified webhooks, not client claims; inventory uses an atomic decrement to make overselling impossible; support tickets auto-route by category and load; and non-critical failures degrade gracefully instead of breaking core transactions.
04 · The outcome
Roughly 60+ endpoints across one cohesive API. Concurrent purchases cannot oversell limited stock. Live in production, serving real paying traders.
05 · Stack