Senior Backend Engineer, Scalable ChatGPT Infra

OpenAI; Greater London; On-site; GBP 191,425 - 304,029; Full time

Job summary

OpenAI in London, UK, seeks a Software Engineer for ChatGPT Infrastructure. You will design, build, and operate backend services that power high-traffic ChatGPT experiences, and collaborate with product teams to roll out safe, scalable capabilities.

The role emphasizes reliability, performance, and ownership of production behavior, with opportunities to lead architectural improvements and contribute to system-wide observability and on-call duties.

Qualifications

• 4+ years of professional software engineering experience, including significant backend or distributed systems.
• Strong proficiency in at least one general-purpose programming language and producing production-grade code.
• Experience designing or improving services, platforms, or shared infrastructure at scale.
• Familiarity with production reliability practices including monitoring, incident response, and RCA.
• Experience diagnosing performance, scalability, or reliability issues in production.

Responsibilities

• Design, build, and maintain backend systems supporting high-traffic ChatGPT experiences.
• Develop shared services, APIs, and infrastructure that help product teams build and launch new capabilities safely.
• Improve the performance, scalability, and efficiency of production systems as usage grows.
• Build and improve systems for asynchronous processing and other large-scale backend workloads.
• Lead architectural improvements and infrastructure migrations with safe rollout and rollback.
• Strengthen monitoring, alerting, and diagnostics to detect problems early and reduce customer impact.
• Participate in on-call, incident response, and root-cause analysis, turning operational learnings into improvements.
• Work across product and infrastructure teams to ensure reliability, security, and production-readiness.

Skills

Backend systems

Distributed systems

Production reliability

Cloud infrastructure

Tools

Kubernetes

Observability tools

Job description

OpenAI in London, UK, seeks a Software Engineer for ChatGPT Infrastructure. You will design, build, and operate backend services that power high-traffic ChatGPT experiences, and collaborate with product teams to roll out safe, scalable capabilities.

The role emphasizes reliability, performance, and ownership of production behavior, with opportunities to lead architectural improvements and contribute to system-wide observability and on-call duties.