Senior Backend / AI Systems Engineer

Build backend systems that power Spellbook’s product experiences, combining traditional services with AI-driven workflows. Own low-latency, high-reliability AI search, inference, and orchestration layers, and operate RAG retrieval at scale with correct permissions isolation. Handle platform concerns like rate limiting, retries, and safe degradation, partner with Product and Design on latency/accuracy tradeoffs, and participate in on-call to improve feature reliability.