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# Full-Stack 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 with meaningful, high-impact work — the kind where your code doesn't just sit in a backlog, it actively influences how AI systems learn and behave at scale.
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 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 used in production AI environments
Collaborate with data, research, and engineering teams to support 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 background
5+ years of professional experience writing production-quality C#
Skilled in data modeling and database access using ORM frameworks or micro-ORMs for high-performance SQL interactions
Experienced building 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 leading AI research labs — not toy projects
Fully remote and async-friendly — work from wherever you do your best work
Freelance autonomy with the structure of meaningful, ongoing technical collaboration
Make a direct, tangible impact on how next-generation AI models are built and evaluated
Potential for ongoing work and contract extension as new projects launch

Work arrangement
Yes