xAI is looking for a Backend Engineer to build and maintain a high-performance API that serves AI models to developers worldwide. The role involves ensuring scalable, reliable, and low-latency infrastructure, managing model serving, request routing, SDK development, and observability across distributed systems.
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Backend Engineer - API at xAI
On-site - Palo Alto, CA, United States
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USD 180,000 - 440,000
Requirements
Skills
- Expert knowledge of either Rust or C++
- Experience in designing, implementing, and maintaining reliable and horizontally scalable distributed systems
- Knowledge of service observability and reliability best practices
- Experience operating commonly used databases such as PostgreSQL, Clickhouse, and MongoDB
- Experience with LLM inference engines and serving frameworks (e.g., SGLang, TensorRT, vLLM)
- Experience designing or building with agent SDKs and agent orchestration frameworks
- Experience with Docker, Kubernetes, and containerized applications
- Expert knowledge of gRPC (unary, response streaming, bi-directional streaming, REST mapping)
- Good understanding of how highly scalable and reliable production infrastructure is built
Responsibilities
- Build the xAI API that serves our models to developers worldwide
- Own the end-to-end system responsible for high-throughput inference, handling billions of tokens per minute with low latency and high availability, including model serving infrastructure, request routing, SDK development, rate limiting, observability, and efficient scaling
Technologies
RustC++GoLLM inference enginesSGLangTensorRTvLLMDockerKubernetesgRPCPostgreSQLClickhouseMongoDBAgent SDKsAgent orchestration frameworks
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