Backend Developer - AI Data Services

Backend Developer — AI Data ServicesAbout The RoleWhat if your C# expertise could directly shape the infrastructure powering next-generation AI? We're looking for a seasoned C# engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve their models.This is a fully remote contract role working on real production systems — not toy projects. You'll collaborate with data, research, and engineering teams at the frontier of AI development, solving hard infrastructure problems that have a direct impact on how the world's most advanced models are built.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance C# systems supporting AI data pipelines and model evaluation workflowsDevelop full-stack tooling and backend services for large-scale data annotation, validation, and quality controlImprove reliability, performance, and correctness across existing C# codebasesCollaborate closely with data, research, and engineering teams to accelerate model training and evaluation workflowsIdentify bottlenecks and edge cases in data and system behavior — then implement scalable, production-ready fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisionsWho You AreNative or fluent English speaker with clear written and verbal communication skillsFull-stack developer with a strong systems programming foundation and 5+ years of professional C# experienceSkilled in data modeling and database access — including ORM frameworks and micro-ORMs for high-performance SQL interactionsExperienced building secure, well-documented APIs and endpoints for data access and manipulationAble to commit reliably to 20–40 hours per week on an ongoing basisSelf-directed and comfortable working asynchronously across a remote-first environmentNice to HavePrior experience with data annotation platforms, data quality systems, or model evaluation pipelinesFamiliarity with AI/ML workflows, model training infrastructure, or benchmarking systemsExperience with distributed systems, developer tooling, or high-throughput data processingWhy Join UsWork directly with leading AI research labs on production systems that matterFully remote and flexible — structure your work around your scheduleFreelance autonomy with the substance of meaningful, technically challenging workContribute to infrastructure that shapes how next-generation AI models are built and evaluatedPotential for ongoing work and contract extension as projects grow and evolve