Sr. Backend Engineer, API

SpaceXSI is building Super Intelligence. We are looking for Backend Engineers to build and operate highly scalable, reliable production infrastructure. Responsibilities include building the unified inference stack, owning platform services for Chat API, Imagine API, Voice API, Grok Build, and Grok Bot, designing Chat API features, implementing chat moderation, building logging systems, managing multi-region deployments, and participating in on-call coverage.

5+ years experience in designing distributed systems, experience with Rust or C++, experience with databases (PostgreSQL, Clickhouse, MongoDB), knowledge of service observability, experience with LLM inference engines (SGLang, TensorRT, vLLM), experience with agent SDKs, Docker, Kubernetes, and expert knowledge of gRPC.