{"id":3988042,"url":"https://alion.io/job/radiant-principal-sdet","title":"Principal SDET","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":80,"open_postings":5,"ghost_share":0,"stale_share":0.8,"repost_share":0,"time_to_fill_p50_days":49,"computed_at":"2026-11-10T06:52:35Z"}},"role":"QA","role_family":"QA","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":"CI/CD","optional":false},{"name":"Go","optional":false},{"name":"gRPC","optional":false},{"name":"Rest API","optional":false}],"status":"live","first_seen_at":"2026-11-09T19:44:04Z","employer_posted_date":"2026-11-09","last_verified_at":"2026-11-10T03:32:08Z","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 SDET, you will help set the technical direction for testing and quality in one of our engineering teams. This is not traditional QA: you'll build the test infrastructure and developer experience that let the team ship quickly and safely.\nYou'll partner closely with software engineers, platform engineers, and SRE.\nThis is a hands-on technical leadership role, through architecture, code, and the standards other teams build on.\nThe teams\nInfra\n\nNetwork\n\nCloud\n\nObservability\n\nMLOps\n\nKey Responsibilities\nSet the test strategy and architecture for your team.\n\nBuild test frameworks for APIs, services, and end-to-end flows.\n\nBuild test environments that reflect real GPU and cluster behaviour.\n\nIntegrate testing into CI/CD so it's fast and reliable.\n\nMake testing easy for every engineer, and raise the quality bar across teams.\n\nYour Profile\nExtensive software engineering experience, focused on testing and quality infrastructure.\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.\n\nExperience testing gRPC and REST APIs and distributed systems.\n\nExperience building end-to-end test frameworks and test environments.\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\nDeveloper experience: Think in fast feedback for engineers, not just test coverage.\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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