Backend Engineer - Scalable Rust/C++ API & Inference

Xai; Greater London; On-site; GBP 107,000 - 262,000; Full time

Benefits offered by this job

Equity

Healthcare and dental coverage

Cash plan

Income protection

Life insurance

Discounts and perks

Job summary

SpaceXAI in the United Kingdom is seeking an experienced backend engineer to help scale our AI infrastructure. You will work on Rust/C++-based systems, building an API that serves models to developers worldwide, with a focus on reliability and performance.

You will own end-to-end inference pipelines, implement observability, and collaborate across teams. The role emphasizes hands-on work, initiative, and delivering excellence in a flat organization.

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.

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.

Skills

Rust

C++

Tools

Docker

Kubernetes

gRPC

Job description

SpaceXAI in the United Kingdom is seeking an experienced backend engineer to help scale our AI infrastructure. You will work on Rust/C++-based systems, building an API that serves models to developers worldwide, with a focus on reliability and performance.

You will own end-to-end inference pipelines, implement observability, and collaborate across teams. The role emphasizes hands-on work, initiative, and delivering excellence in a flat organization.