{"id":40528,"url":"https://alion.io/job/radiant-principal-software-engineer-cloud-platform","title":"Principal Backend Software 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":"A","score":92,"open_postings":15,"ghost_share":0,"stale_share":0.333,"repost_share":0,"time_to_fill_p50_days":56,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":100000,"max_usd":196000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":46},"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":"Kubernetes","optional":false},{"name":"Machine Learning","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Rest API","optional":false},{"name":"KServe","optional":true},{"name":"Python","optional":true},{"name":"Ray","optional":true},{"name":"Triton","optional":true},{"name":"vLLM","optional":true}],"status":"live","first_seen_at":"2026-05-01T11:57:52Z","employer_posted_date":"2026-10-13","last_verified_at":"2026-10-17T02:41:54Z","board_verified":true,"closed_at":null,"days_open":168,"trust":{"level":"stale","repost_count":1,"flags":["stale"],"days_open":167},"description":"About the Role\nAs 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.\nYou’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.\nWhat You’ll Do:\nDesign and develop core services for the Radiant AI Cloud\n\nArchitect and build core backend services in Go that power AI infrastructure, networking, inference orchestration, and model lifecycle management\n\nLead engineering design efforts across the backend domain - architecture reviews, and system evolution strategies\n\nCollaborate closely with platform and infrastructure to deliver reliable, secure, production-grade services\n\nDrive technical standards and mentorship, upholding code quality, observability, and maintainability across teams\n\nProactively identify and resolve architectural bottlenecks, performance issues, or scaling challenges\n\nWhat you bring:\nProven expertise in Golang and cloud-native backend development\n\nDeep experience designing and deploying distributed systems and APIs (gRPC, REST) in production environments\n\nStrong knowledge of Kubernetes internals, with deep understanding of primitives, deployments and reconciliation loops.\n\nExperience with PostgreSQL or equivalent high-performance data stores\n\nExperience with CI/CD workflows, observability, security and automation best practices\n\nDemonstrated ability to lead technically: mentor others, drive architectural thinking, and influence across teams\n\nA bias for action, accountability, and leading by example\n\nPreferred Skills (Nice to Have)\nExperience with AI/ML infrastructure tooling (e.g. vLLM, KServe, Ray, Triton)\n\nFamiliarity with Python, especially ML libraries and model interfaces\n\nFamiliarity with GPU scheduling, inference pipelines, or resource-constrained workload orchestration\n\nExposure to GPU orchestration frameworks or building services for model training/inference\n\nUnderstanding of multi-tenant systems, isolation strategies, and secure infrastructure for AI workloads\n\nHow you work:\nYou approach problems with a systems mindset - balancing practical execution with long-term scalability\n\nYou elevate the team, setting high standards for technical quality and engineering excellence.\n\nYou hold yourself and others accountable - giving direct feedback and expecting the same\n\nYou take initiative, owning challenges end-to-end and proactively driving solutions.\n\nYou invest in others, mentoring to build both capability and confidence.\n\nYou communicate clearly - translating complexity into clarity across engineering and business audiences\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 feedbac k: 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\n Diversity, Equality, Inclusion and Belonging\nWe are an equal opportunity employer and we strive to reduce unconscious bias throughout our hiring process. All applicants will be considered for employment without attention to ethnicity, religion, sexual orientation, gender identity, family or parental status, national origin, veteran, neurodiversity status or disability status. To ensure our recruitment processes provide an equal opportunity for all applicants to succeed, we encourage you to let us know if there are any adjustments that we can make.","description_format":"text","description_chars":5119,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Annual leave","Health insurance"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["MLOps","AI Compute & Inference"],"lifecycle":[{"event":"open","at":"2026-05-01T11:57:52Z"},{"event":"close","at":"2026-09-03T14:13:23Z"},{"event":"reopen","at":"2026-10-13T19:51:13Z"}],"visa":[],"liveness":{"score":13,"band":"cold","label":"Long shot","p_open":1,"p_active":0.481,"p_room":0.28,"age_days":167,"expected_fill_days":56,"reasons":["conf:0","velocity","win:tail","crowd:"],"computed_at":"2026-10-16T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/radiant-principal-software-engineer-cloud-platform","json_url":"https://alion.io/job/radiant-principal-software-engineer-cloud-platform.json","meta":{"generated_at":"2026-10-17T03:57:38Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":5180,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":8822},"rest":"https://alion.io/mcp/rest/get_company?id=8822"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fradiant-principal-software-engineer-cloud-platform"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fradiant-principal-software-engineer-cloud-platform"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fradiant-principal-software-engineer-cloud-platform"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/radiant-principal-software-engineer-cloud-platform\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fradiant-principal-software-engineer-cloud-platform"}]}