Backend Developer - AI Data Services

About The Role

What if your C# expertise could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a seasoned C# engineer to design and build the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation models.

This is a fully remote contract role with meaningful, high-impact work on real production systems — not toy projects. If you thrive on complex engineering challenges and want your work to matter at scale, this is the opportunity.

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

• Design, build, and optimize high-performance C# systems that support 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 existing C# codebases
• Collaborate closely with data, research, and engineering teams to support model training and evaluation pipelines
• 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

• 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 — ORMs, micro-ORMs, and high-performance SQL
• Experienced building secure, well-documented endpoints for data access and manipulation
• Able to commit 20–40 hours per week consistently

• 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 at scale

• Work directly with leading AI research labs on systems that influence next-generation model development
• Fully remote — work from wherever you do your best work
• Flexible contract engagement with a consistent, meaningful workload
• Collaborate with a sharp, mission-driven team across data, research, and engineering
• Potential for ongoing work and expanded scope as projects grow