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 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 their models. This is a fully remote contract role with meaningful, high-impact work — the kind where your code doesn't just sit in a backlog, it actively influences how AI systems learn and behave at scale. 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 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 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, 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-quality CSkilled in data modeling and database access using ORM frameworks or micro-ORMs for high-performance SQL interactionsExperienced building 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 leading AI research labs — not toy projectsFully remote and async-friendly — work from wherever you do your best workFreelance autonomy with the structure of meaningful, ongoing technical collaborationMake a direct, tangible impact on how next-generation AI models are built and evaluatedPotential for ongoing work and contract extension as new projects launch