Senior C# Full-Stack Engineer — AI Data
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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 working on real production systems — not toy projects. You'll be embedded in high-impact engineering workflows alongside data, research, and infrastructure teams pushing the frontier of AI development.
• Organization: Alignerr
• Type: Hourly Contract
•
Location:
Remote
• Commitment: 20–40 hours/week
What You'll Do
• Design, build, and optimize high-performance C# systems that power 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 production C# codebases
• Collaborate with data, research, and engineering teams to support model training and evaluation infrastructure
• 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
• Experienced full-stack developer with a strong systems programming foundation
• 3–5+ years of professional experience writing production C# code, with familiarity in modern standards and best practices
• Strong background in performance optimization, concurrency (threading, atomics), and memory safety
• Able to commit 20–40 hours per week consistently
• Self-directed and comfortable working autonomously in a remote environment 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 internal developer tooling
• Exposure to C++17/C++20 or other systems-level languages Why Join Us
• Work directly with leading AI labs on production systems that shape next-generation models
• Fully remote and flexible — structure your work around your life
• Freelance autonomy with the depth and impact of meaningful, long-term technical work
• Contribute to AI infrastructure that has real, lasting consequences for how models are built and evaluated
• Potential for ongoing work and contract extension as new projects launch
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