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
