Senior Backend Engineer (C#) - AI Data Platform
About this role
About the Role What if your expertise in C and backend systems could directly shape the infrastructure powering the world's most advanced AI models? We're looking for a Senior C Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve next-generation AI. This is a fully remote contract role with flexible scheduling. You'll work on real production systems alongside data, research, and engineering teams — doing work that has a measurable impact on how AI is built. - 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 backend services and full-stack 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 - 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 building RESTful APIs and RPC services for inter-service communication - Experienced integrating with cloud-native data services and orchestrating workflows via message bus architectures - Able to commit 20–40 hours per week consistently 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 Why Join Us - Work directly on cutting-edge AI infrastructure alongside leading research labs - Fully remote and flexible — work from wherever you do your best work - Freelance autonomy with the structure and impact of meaningful, high-stakes engineering - Contribute to systems that directly influence how next-generation AI models are built and evaluated - Potential for ongoing work and contract extension as new projects launch
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