SpaceXAI - Backend Engineer - API

London, England, United Kingdom£107k - £262k/year+ Equity3w ago

In Office EMEA Artificial Intelligence Backend Engineer Rust C++PostgreSQL MongoDB ClickHouse

Requirements

• 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 • 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)

Responsibilities

• Build the SpaceXAI 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

Benefits

• £107,000 - £262,000 GBP • Base salary is just one part of our total rewards package at SpaceXAI, which also includes equity, comprehensive healthcare and dental coverage, cash plan, income protection, life insurance, and various other discounts and perks.