Backend Developer - AI Data Services
Seattle
**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: Alignerr * Type: Hourly Contract * Location: Remote * Commitment: 20--40 hours/week **What You'll Do** * Design, build, and optimize high-performance C# systems supporting AI data pipelines and model evaluation workflows * Develop full-stack tooling and backend services for large-scale data annotation, validation, and quality control * Improve reliability, performance, and safety across production C# codebases * Collaborate with data, research, and engineering teams to support model training and evaluation infrastructure * Identify bottlenecks and edge cases in 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 * Full-stack developer with a strong systems programming background * 5+ 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 interactions * Proven ability to build secure, well-documented endpoints for data access and manipulation * Able to commit 20--40 hours per week consistently **Nice to Have** * Prior experience with data annotation, data quality pipelines, or evaluation systems * Familiarity with AI/ML workflows, model training, or benchmarking infrastructure * Experience with distributed systems or developer tooling at scale **Why Join Us** * Work on real production systems alongside researchers and engineers at leading AI labs * Fully remote and async-friendly --- work from wherever you do your best work * Freelance autonomy with the structure and consistency of ongoing, meaningful project work * Gain direct exposure to cutting-edge AI development at the infrastructure level * Potential for extended engagement as projects evolve and new workstreams launch
