{"schemaVersion":"jobsearcher.job.v1","id":"57cfef5b742e82b52bb7ae33","url":"https://jobsearcher.com/jobs/57cfef5b742e82b52bb7ae33","canonicalUrl":"https://jobsearcher.com/jobs/57cfef5b742e82b52bb7ae33","title":"Senior C# Full-Stack Engineer — AI Data & Infrastructure","description":"About The RoleWhat if your C# expertise could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C# Full-Stack Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation models.This is a fully remote, flexible contract role for an experienced engineer who wants to work on real production systems at the frontier of AI — not just maintain legacy code, but architect meaningful infrastructure that matters.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance C# systems that support AI data pipelines and evaluation workflowsDevelop full-stack tooling and backend services for large-scale data annotation, validation, and quality controlImprove reliability, performance, and safety across existing C# codebases used in production AI environmentsCollaborate closely with data, research, and engineering teams to support model training and evaluation workflowsIdentify bottlenecks and edge cases in data and system behavior — then implement scalable, robust fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisionsWho You AreFull-stack developer with a strong systems programming background and deep command of C#3–5+ years of professional experience writing production-grade C# code, with familiarity with modern standardsSolid grounding in performance optimization, concurrency (threading, atomics), and memory safetyNative or fluent English speaker with clear written and verbal communication skillsSelf-directed and reliable — able to commit 20–40 hours per week and deliver consistently without hand-holdingComfortable navigating complex codebases and making principled architectural decisions under real constraintsNice to HavePrior experience with data annotation platforms, data quality systems, or evaluation infrastructureFamiliarity with AI/ML workflows, model training pipelines, or benchmarking systemsExperience building distributed systems or developer tooling at scaleBackground working alongside research or applied AI teamsWhy Join UsWork at the frontier of AI — your code will directly influence how the world's leading models are built and evaluatedFully remote and flexible — structure your hours around your life, not the other way aroundCollaborate with world-class research and engineering teams on genuinely hard problemsFreelance autonomy with the substance of high-impact, technically demanding workPotential for ongoing work and contract extension as projects evolve and expand","company":"Alignerr","rawCompany":"alignerr","city":"Denver","state":"CO","isRemote":false,"isActive":true,"createdAt":"2026-04-09T09:04:12.061Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Senior C# Full-Stack Engineer — AI Data & Infrastructure","description":"About The RoleWhat if your C# expertise could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C# Full-Stack Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation models.This is a fully remote, flexible contract role for an experienced engineer who wants to work on real production systems at the frontier of AI — not just maintain legacy code, but architect meaningful infrastructure that matters.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance C# systems that support AI data pipelines and evaluation workflowsDevelop full-stack tooling and backend services for large-scale data annotation, validation, and quality controlImprove reliability, performance, and safety across existing C# codebases used in production AI environmentsCollaborate closely with data, research, and engineering teams to support model training and evaluation workflowsIdentify bottlenecks and edge cases in data and system behavior — then implement scalable, robust fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisionsWho You AreFull-stack developer with a strong systems programming background and deep command of C#3–5+ years of professional experience writing production-grade C# code, with familiarity with modern standardsSolid grounding in performance optimization, concurrency (threading, atomics), and memory safetyNative or fluent English speaker with clear written and verbal communication skillsSelf-directed and reliable — able to commit 20–40 hours per week and deliver consistently without hand-holdingComfortable navigating complex codebases and making principled architectural decisions under real constraintsNice to HavePrior experience with data annotation platforms, data quality systems, or evaluation infrastructureFamiliarity with AI/ML workflows, model training pipelines, or benchmarking systemsExperience building distributed systems or developer tooling at scaleBackground working alongside research or applied AI teamsWhy Join UsWork at the frontier of AI — your code will directly influence how the world's leading models are built and evaluatedFully remote and flexible — structure your hours around your life, not the other way aroundCollaborate with world-class research and engineering teams on genuinely hard problemsFreelance autonomy with the substance of high-impact, technically demanding workPotential for ongoing work and contract extension as projects evolve and expand","datePosted":"2026-04-09T09:04:12.061Z","dateModified":"2026-04-09T09:04:12.061Z","hiringOrganization":{"@type":"Organization","name":"Alignerr","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Denver","addressRegion":"CO","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"57cfef5b742e82b52bb7ae33"},"url":"https://jobsearcher.com/jobs/57cfef5b742e82b52bb7ae33"}}