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