Backend Developer - AI Data Services

Backend Developer — AI Data Services About The Role What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for a senior-level full-stack engineer to design and build 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 with flexible hours. You'll work on real production systems — not toy projects — alongside data, research, and engineering teams at the forefront of AI development. Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/week What You'll Do Design, build, and optimize high-performance C# systems supporting large-scale AI data pipelines and evaluation workflowsDevelop full-stack backend tooling and services for data annotation, validation, and quality controlImprove the reliability, performance, and safety of existing C# codebasesCollaborate with research and engineering teams to support model training and evaluation infrastructureIdentify bottlenecks and edge cases across data and system behavior, then implement scalable, production-ready fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisions Who You Are Native or fluent English speaker with clear written and verbal communication skillsExperienced full-stack developer with a strong systems programming background5+ years of professional experience writing production-grade C#Skilled in data modeling and database access using ORM frameworks or micro-ORMs for high-performance SQL interactionsProven experience building secure, well-documented endpoints for data access and manipulationAble to commit reliably to 20–40 hours per week Nice to Have Prior experience with data annotation, data quality systems, or evaluation pipelinesFamiliarity with AI/ML workflows, model training, or benchmarking infrastructureExperience with distributed systems or developer tooling Why Join Us Work on cutting-edge AI infrastructure projects alongside leading research labsFully remote and flexible — work when and where it suits youFreelance autonomy with the structure and substance of high-impact, meaningful workMake a direct, tangible contribution to the systems that shape how AI learns and improvesPotential for ongoing work and contract extension as new projects launch