Principal Software Engineer: Cloud Platform

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About this role

Principal Software Engineer: Cloud Platform London, England, United Kingdom Job Role As a Principal Software Engineer at Radiant, you'll be a hands-on technical leader, driving the design and development of our most critical systems, including our GPU orchestration layer, inference-serving infrastructure, and core platform APIs. You'll set the standard for engineering excellence across the team, working closely with other principal engineers to align on strategy and drive technical leadership. You'll partner with peers in infrastructure and machine learning to deliver high-performance AI systems, and mentor engineers across multiple squads. While you won't have direct reports, you'll play a pivotal role in shaping engineering direction, design decisions, and cross-team collaboration. What You'll Do: - 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 What you bring: - Proven expertise in Golang and cloud-native backend development - Deep experience designing and deploying distributed systems and APIs (gRPC, REST) in production environments - Strong knowledge of Kubernetes internals, with deep understanding of primitives, deployments and reconciliation loops. - Experience with PostgreSQL or equivalent high-performance data stores -

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