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 every day.
This is a fully remote contract role with meaningful technical depth and real production impact. You'll work alongside data, research, and engineering teams at the frontier of AI development — solving hard problems 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
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 and code reviews to iterate on system architecture and implementation decisions
Who You Are
Native or fluent English speaker with clear written and verbal communication skills
Experienced full-stack developer with a strong systems programming background
3–5+ years of professional experience writing production C# with a focus on modern standards
Deep understanding of performance optimization, concurrency (threading, atomics), and memory safety
Self-directed and reliable — able to commit 20–40 hours per week and deliver without hand-holding
Nice to Have
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
Background in C++17/C++20 or other systems-level languages
Why Join Us
Work on real production systems used by leading AI research labs
Fully remote — work from anywhere, on a schedule that suits you
Freelance autonomy with the structure of impactful, technically demanding work
Contribute to infrastructure that directly influences how next-generation AI models are built and evaluated
Potential for ongoing work and contract extension as new projects launch