Backend Engineer na xAI

London, UK

Backend Engineer role at xAI focused on building and maintaining high‑performance, scalable backend infrastructure that powers the company's API. Candidates will work on production systems written primarily in Rust, designing reliable distributed services, ensuring observability, and managing databases such as PostgreSQL, Clickhouse, and MongoDB. The role emphasizes precision, user‑centric solutions, and strong communication skills within a small, flat‑structured team.

Salary

GBP 107,000 - 262,000

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 in operating commonly used databases such as PostgreSQL, Clickhouse, and MongoDB
Knowledge of Python
Experience with Docker, Kubernetes, and containerized applications
Expert knowledge of gRPC (unary, response streaming, bi‑directional streaming, REST mapping)
Hands‑on experience with LLM APIs, embeddings, or RAG patterns
Track record of delivering user‑facing software at scale

Responsibilities

Work on xAI's production systems that power the API
Design, implement, and maintain reliable and horizontally scalable distributed systems
Ensure service observability, reliability, and performance
Operate and manage databases such as PostgreSQL, Clickhouse, and MongoDB

Technologies

RustC++GoPostgreSQLClickhouseMongoDBPythonDockerKubernetesgRPCLLM APIsembeddingsRAG patterns

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