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: reputed company • Type: Hourly Contract • Location: Remote • Commitment: 20–40 hours/week What You'll Do • Design, build, and optimize high-performance C# systems supporting large-reputed company data pipelines and evaluation workflows • Develop full-stack backend tooling and services for data annotation, validation, and quality control • Improve the reliability, performance, and safety of existing C# codebases • Collaborate with research and engineering teams to support model training and evaluation infrastructure • Identify bottlenecks and edge reputed company across data and system behavior, then implement scalable, production-ready fixes • Participate 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 skills • Experienced full-stack developer with a strong systems programming background • 5+ 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 interactions • Proven experience building secure, well-documented endpoints for data access and manipulation • Able to commit reliably to 20–40 hours per week Nice to Have • Prior experience with data annotation, data quality systems, or evaluation pipelines • Familiarity with AI/ML workflows, model training, or benchmarking infrastructure • Experience with distributed systems or developer tooling Why Join Us • Work on cutting-edge AI infrastructure projects alongside leading research labs • Fully remote and flexible — work when and where it suits you • Freelance autonomy with the structure and substance of high-impact, meaningful work • Make a direct, tangible contribution to the systems that shape how AI learns and improves • Potential for ongoing work and contract extension as new projects launch Apply tot his job Apply To this Job