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 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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