Senior Backend Engineer (C#) - AI Data Platform
About this role
About the Role What if your C engineering skills could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C Engineer to design and build the data pipelines, annotation tooling, and evaluation infrastructure that leading AI labs depend on to train and improve next-generation models. This is a fully remote, flexible contract role working on real production systems at the frontier of AI development. If you're a seasoned backend engineer who wants meaningful, high-impact work — this is it. - 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 model evaluation workflows - Develop backend services and tooling 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 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 - 5+ years of professional experience building scalable backend services in C - Strong systems programming background with full-stack development experience - Deep expertise in modern frameworks for RESTful APIs and RPC services - Experienced integrating cloud-native data services and orchestrating workflows via message bus architectures - Able to commit 20–40 hours per week with reliability and consistency Nice to Have - Prior experience with data annotation, data quality pipelines, or model evaluation systems - Familiarity with AI/ML workflows, model training, or benchmarking infrastructure - Background in distributed systems design or developer tooling Why Join Us - Work directly on cutting-edge AI projects alongside the world's leading research labs - Fully remote and flexible — structure your hours around your life - Freelance autonomy with the substance of high-impact, technically challenging work - Contribute to infrastructure that shapes the future of AI at a foundational level - Potential for ongoing engagement and expanded scope as new projects launch
Application listings
Choose a source listing and check its country requirements.