Backend Engineer

ABOUT xAI xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates. ABOUT THE ROLE: In this role you will work on xAI's production systems that power the API. The actual team matching will happen at the offer stage. As an ideal candidate you have a good understanding of how highly scalable and reliable production infrastructure is built. You strive for perfection and listen carefully to your users in order to solve any pain points they might experience. Most of our backend infrastructure is written in Rust. So familiarity with a compiled language such as C++, Rust, or Go is highly beneficial. BASIC QUALIFICATIONS: • 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. PREFERRED SKILLS AND EXPERIENCE • 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. COMPENSATION AND BENEFITS: £107,000 - £262,000 GBP Base salary is just one part of our total rewards package at xAI, which also includes equity, comprehensive healthcare and dental coverage, cash plan, income protection, life insurance, and various other discounts and perks. xAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice .