{"id":3988035,"url":"https://alion.io/job/radiant-principal-platform-engineer","title":"Principal Platform Engineer","company":{"id":8822,"name":"Radiant","domain":"radiant.com","url":"https://alion.io/company/radiant","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":83,"open_postings":3,"ghost_share":0,"stale_share":0.667,"repost_share":0,"time_to_fill_p50_days":49,"computed_at":"2026-11-09T06:03:00Z"}},"role":"DevOps","role_family":"DevOps","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Gloucester, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ansible","optional":false},{"name":"CI/CD","optional":false},{"name":"Configuration Management","optional":false},{"name":"GitOps","optional":false},{"name":"HPC","optional":false},{"name":"Kubernetes","optional":false},{"name":"Linux","optional":false},{"name":"Python","optional":false},{"name":"Terraform","optional":false}],"status":"live","first_seen_at":"2026-11-09T20:01:52Z","employer_posted_date":"2026-11-09","last_verified_at":"2026-11-09T22:19:01Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"What You'll Do\nAs a Principal Platform Engineer, you will help set the technical direction for the platform one of our engineering teams builds on: the infrastructure, tooling, and automation that let us run GPU clusters, Kubernetes, and our managed services reliably at scale.\nYou'll partner closely with software engineers, SRE, Infra Ops, and the other platform engineers across Radiant.\nThis is a hands-on technical leadership role focused on making the platform reliable, secure, and easy to build on, through architecture, code, and the standards other teams build on.\nThe teams\nInfra: the platform behind provisioning and cluster management\n\nNetwork: the platform behind our fabrics and Managed Networks\n\nCloud: the platform behind our Virtual Machines and console\n\nObservability: the platform behind FlightDeck\n\nMLOps: the platform behind training and inference\n\nKey Responsibilities\nSet the platform architecture and roadmap for your team, and lead its design and implementation.\n\nLead infrastructure-as-code, automation, and deployment at scale.\n\nMake environments reproducible, secure, and fast to change.\n\nOwn the reliability and operability of the platform, with SRE and Infra Ops.\n\nDefine standards for CI/CD, observability, and configuration across teams.\n\nRaise the engineering bar through mentoring, design and code review, and technical standards.\n\nYour Profile\nExtensive experience in platform, infrastructure, or SRE engineering at scale.\n\nA track record of technical leadership at staff or principal level, including setting direction across multiple teams and delivering complex, high-stakes systems.\n\nStrong hands-on engineering skills in Go, Python, or similar.\n\nDeep technical expertise across:\n\nKubernetes and containers in production, including operators\n\nInfrastructure-as-code and configuration management (e.g. Terraform, Ansible)\n\nCI/CD, release engineering, and GitOps\n\nLinux, networking, and cloud or bare-metal infrastructure\n\nExperience with GPU, HPC, or bare-metal platforms is a strong plus.\n\nExcellent written and verbal communication, including clear design documents and explaining complex trade-offs to technical and non-technical audiences.\n\nWhat You Bring\nPlatform thinking: Build the foundations other engineers rely on, and make them easy to use.\n\nEngineering excellence: Write and review code that sets the standard for correctness, performance, and maintainability.\n\nArchitectural judgement: Make sound long-term decisions on systems that are hard to change once built.\n\nTechnical leadership: Influence direction across teams without relying on authority, and grow the engineers around you.\n\nSystems thinking: Understand how your area interacts with compute, networking, storage, and the rest of the cloud platform.\n\nOwnership: Drive capabilities from design through production, operation, and continuous improvement.\n\nQualities we look for:\nSet the standard: Every single day, you spot opportunities to constructively shake things up\n\nInspire the change: There's no blueprint for the future. You'll embrace challenges and change\n\nYou're real and you're true to yourself: We cherish and celebrate diversity so you'll feel right at home whoever you are and whoever you're talking to, you treat everyone the same.\n\nWhy should you join us?\nWhat sets us apart is our blend of modern technology, competitive benefits, and an open, welcoming work culture that enables our people to thrive.\nHere are just some of the great things you can expect from us:\n25 days of annual leave\n\nA culture that emphasises results over hierarchy, process & ego: we place great emphasis on the quality, ingenuity and creativity of work.\n\nOpen communication, regular feedback: we value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and a growth mindset makes us better together.\n\nLearning Time: we all have dedicated learning time to focus on new skills, projects or interests that lay outside of your day-to-day job.\n\nHealth & Wellbeing: we want everyone to feel healthy and happy, so we offer private medical insurance via Bupa.\n\nCycle to Work Scheme: we're committed to building a sustainable business, so we encourage cycling to work.\n\nGympass subscription to a variety of gyms and wellbeing apps\n\nParticipation in the company shares program\n\nEnhanced parental pay & leave\n\nOur process: Talent screen → Hiring Manager → Technical interview (two Principal Engineers) → Whiteboard → Session Final.\nCompany Overview:\nRadiant is redefining how AI infrastructure is built.\nWe design and operate AI-native cloud platforms engineered for sovereignty, performance, and scale. Our infrastructure powers GPU-native workloads, multi-tenant control planes, and high-performance AI systems designed for the most demanding environments.\nWe are not building a generic cloud. We are building purpose-built AI infrastructure - from powered land, to compute, to software.\nAs we scale, we're building this organisation from the ground up. We're looking for people who'd rather build the playbook than inherit one - who are comfortable doing the work themselves as well as directing others, and who can adapt as fast as our strategy does. 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