Backend Developer - AI Data Services

Backend Developer — AI Data Services About The Role What if your C# expertise could directly shape the infrastructure powering next-generation AI?

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 every day. This is a fully remote contract role with meaningful, high-impact work.

You won't be maintaining legacy CRUD apps — you'll be solving real engineering problems at the frontier 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 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 safety across production C# codebasesCollaborate with data, research, and engineering teams to support model training and evaluation infrastructureIdentify 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 decisions Who You Are Native or fluent English speaker with clear written and verbal communication skillsFull-stack developer with a strong systems programming background5+ years of professional experience writing production-grade C#Experienced in data modeling and database access using ORM frameworks or micro-ORMs for high-performance SQL interactionsProven ability to build secure, well-documented endpoints for data access and manipulationAble to commit 20–40 hours per week consistently Nice to Have Prior experience with data annotation, data quality pipelines, or evaluation systemsFamiliarity with AI/ML workflows, model training, or benchmarking infrastructureExperience with distributed systems or developer tooling at scale Why Join Us Work on real production systems alongside researchers and engineers at leading AI labsFully remote and async-friendly — work from wherever you do your best workFreelance autonomy with the structure and consistency of ongoing, meaningful project workGain direct exposure to cutting-edge AI development at the infrastructure levelPotential for extended engagement as projects evolve and new workstreams launch