Senior C# Full-Stack Engineer — AI Data & Infrastructure
About this role
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
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