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 seasoned C# 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 working on real production systems — not toy projects. You'll collaborate with data, research, and engineering teams at the frontier of AI development, solving hard infrastructure problems that have a direct impact on how the world's most advanced models are built.
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 correctness across existing C# codebases
Collaborate closely with data, research, and engineering teams to accelerate model training and evaluation workflows
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 foundation and 5+ years of professional C# experience
Skilled in data modeling and database access — including ORM frameworks and micro-ORMs for high-performance SQL interactions
Experienced building secure, well-documented APIs and endpoints for data access and manipulation
Able to commit reliably to 20–40 hours per week on an ongoing basis
Self-directed and comfortable working asynchronously across a remote-first environment
Nice to Have
Prior experience with data annotation platforms, data quality systems, or model evaluation pipelines
Familiarity with AI/ML workflows, model training infrastructure, or benchmarking systems
Experience with distributed systems, developer tooling, or high-throughput data processing
Why Join Us
Work directly with leading AI research labs on production systems that matter
Fully remote and flexible — structure your work around your schedule
Freelance autonomy with the substance of meaningful, technically challenging work
Contribute to infrastructure that shapes how next-generation AI models are built and evaluated
Potential for ongoing work and contract extension as projects grow and evolve