C++ Backend Engineer - AI Data Platforms
About this role
About the Role What if your C++ expertise could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C++ Engineer to build and optimize the high-performance data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and ship next-generation models. This is a fully remote, flexible contract role. 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 backend services and tooling for large-scale data annotation, validation, and quality control - Improve reliability, performance, and safety across production C++ codebases - Identify bottlenecks and edge cases in data and system behavior — then implement scalable, lasting fixes - Collaborate with research and engineering teams to support model training and benchmarking workflows - 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 writing production-grade C++ - Strong background in asynchronous network programming — event loops, RPC frameworks, or similar - Experienced with high-throughput databases or message queues in production environments - Systems thinker who can hold both low-level performance and high-level architecture in mind at once - Able to commit 20–40 hours per week with reliability and focus 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 design or developer tooling - Background working directly with AI labs or research-driven engineering teams Why Join Us - Work on cutting-edge AI infrastructure alongside leading research labs - Fully remote and async-friendly — work when and where you're most effective - Freelance autonomy with the substance of high-impact, production-grade engineering work - Make a direct, tangible contribution to the AI systems shaping how the world works - Potential for ongoing work and contract extension as new projects launch
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