Backend Systems Engineer

We're looking for a Backend Systems Engineer to join Fullstack. Fullstack Trade is building the only unified front-end trading app for retail crypto – perps, cross-chain spot, and prediction markets under one portfolio margin balance. No bridging, no fragmentation. Founded by Flood, creator of Insilico Terminal ($900B CEX volume, 90% market share), and Robin, operated a leading CEX and on-chain HFT firm. Launching Jan/Feb 2027. You will - Build risk and liquidation engines that manage risk and capital efficiency in volatile markets. - Design blockchain state machines powering trading, settlement, and risk operations. - Build consensus and coordination services that keep state consistent across async processes. - Process live market data: WebSocket streams and time-sensitive workflows across trading venues. - Ship high-performance REST and WebSocket APIs with millisecond-level response times. Requirements - 2–4 years of backend experience with production Rust. - Real-time, high-throughput backend services (systems-level, not pipeline work). - Async programming with Tokio. - Relational, time-series, and key-value databases. - Startup or VC-backed company experience. - Active public GitHub with Rust or C projects outside of work. - Genuine passion for trading: you actively trade perps or prediction markets, run trading bots, or build on-chain. - US work authorization: TN and H1B transfers supported (not in year 3 or 6), no OPT/F1. - On-site 5 days/week in NYC or SF. Stack - Rust, Tokio, distributed systems, blockchain, REST APIs, WebSockets, Docker. Nice to have - Fintech, crypto, or HFT background. - Low-latency or trading systems experience. We offer - Up to $300k/year salary + equity. - Small team of builders, direct work with the founders. - NYC office or SF hacker house and Paradigm offices.