Software Engineer (C#) - Internal Tooling
About this role
About the Role What if your C skills could directly shape the infrastructure powering next-generation AI systems used by millions of people? We're looking for a senior full-stack C engineer to build and optimize the internal tooling, data pipelines, and evaluation systems that leading AI labs depend on every day. This is a fully remote contract role with flexible hours. You'll work on real production systems — not toy projects — alongside data, research, and engineering teams at 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 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 fixes - Participate in synchronous design reviews to iterate on architecture and implementation decisions Who You Are - Native or fluent English speaker with strong written and verbal communication skills - Full-stack developer with a solid systems programming background - 3–5+ years of professional experience writing production-grade C - Experienced with interoperability scenarios — invoking Python ML models from .NET, wrapping native libraries, or similar cross-language integrations - Skilled at designing robust harnesses for benchmarking and evaluating system performance - Able to commit 20–40 hours per week with reliability and consistency 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 research infrastructure or high-throughput data processing Why Join Us - Work on cutting-edge AI projects alongside leading research labs - Fully remote and flexible — work when and where it suits you - Freelance autonomy with the structure of meaningful, high-impact engineering work - Make a direct, tangible contribution to the infrastructure driving the next generation of AI - Potential for ongoing work and contract extension as new projects launch
Application listings
Choose a source listing and check its country requirements.