Senior Backend Engineer · Crypto Payments & Real-Time Systems

Backend systems engineer specializing in the load-bearing infrastructure that crypto, fintech, and iGaming platforms depend on but rarely build well in-house.

What I've shipped:

• Crypto payment integrations: MeshConnect (cross-chain wallet routing), Onramper (HMAC-SHA256 URL signing), Coinflow (fiat/crypto deposits & withdrawals), stablecoin rails
• Real-time WebSocket infrastructure handling 20k+ concurrent connections per process with Redis pub/sub cross-instance fan-out
• Custom Kafka consumer with partition-aware deterministic worker routing across 32-worker pools
• Bonus, promotion, and referral systems on two production real-money...