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# engineer to 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, flexible contract role where your work goes straight into production — no bureaucratic overhead, no filler tasks. Just high-impact engineering on systems that matter.

• Organization: Alignerr
• Type: Hourly Contract
• Location: Remote
• Commitment: 20–40 hours/week
  
  

• Design, build, and optimize high-performance C# systems supporting AI data pipelines and evaluation workflows
• Develop full-stack tooling and backend services for large-scale data annotation, validation, and quality control
• Improve reliability, performance, and safety across existing C# codebases
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Identify bottlenecks and edge cases in data and system behavior, and implement scalable fixes
• Participate in synchronous design reviews to iterate on architecture and implementation decisions
  
  

• 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#
• Strong skills in data modeling and database access using ORM or micro-ORM frameworks for high-performance SQL interactions
• Experienced building secure, well-documented endpoints for data access and manipulation
• Able to commit 20–40 hours per week with reliable availability
  
  

• Prior experience with data annotation, data quality, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems or developer tooling
  
  

• Work directly with leading AI labs on production systems that power cutting-edge research
• Fully remote and flexible — work from wherever you do your best thinking
• Freelance autonomy with meaningful, technically challenging work
• Make a direct, tangible impact on how AI systems are built and evaluated at scale
• Potential for ongoing work and contract extension as new projects launch