Principal Backend Engineer — AI Cloud & Scale Leader

Radiant; Greater London; On-site; GBP 110,000 - 150,000; Full time

Benefits offered by this job

Annual leave 25 days

Learning Time

Cycle to Work Scheme

Gympass subscription

Company shares program

Private medical insurance via Bupa

Job summary

Radiant is seeking a Principal Software Engineer in the UK to lead design and development of core systems in a hands-on technical role. You will help shape the Radiant AI Cloud, guide architecture, and mentor engineers across squads while collaborating with infrastructure and ML teams to deliver high-performance AI capabilities.

You’ll drive backend excellence, design scalable services, and ensure robust security and observability.

Qualifications

• Proven expertise in Golang and cloud-native backend development.
• Deep experience designing and deploying distributed systems and APIs (gRPC, REST).
• Strong knowledge of Kubernetes internals, deployments and reconciliation loops.
• Experience with PostgreSQL or equivalent high-performance data stores.
• Experience with CI/CD workflows, observability, security and automation best practices.

Responsibilities

• Design and develop core services for the Radiant AI Cloud.
• Architect and build core backend services in Go that power AI infrastructure, networking, inference orchestration, and model lifecycle management.
• Lead engineering design efforts across the backend domain - architecture reviews, and system evolution strategies.
• Collaborate closely with platform and infrastructure to deliver reliable, secure, production-grade services.
• Drive technical standards and mentorship, upholding code quality, observability, and maintainability across teams.
• Proactively identify and resolve architectural bottlenecks, performance issues, or scaling challenges.

Skills

Golang

Cloud-native

Distributed systems

Kubernetes internals

PostgreSQL

CI/CD

Mentorship

Technical leadership

Tools

gRPC

REST

Job description

Radiant is seeking a Principal Software Engineer in the UK to lead design and development of core systems in a hands-on technical role. You will help shape the Radiant AI Cloud, guide architecture, and mentor engineers across squads while collaborating with infrastructure and ML teams to deliver high-performance AI capabilities.

You’ll drive backend excellence, design scalable services, and ensure robust security and observability.