C++ Backend Engineer - AI Data Platforms

C++ Backend Engineer — AI Data Platforms About The Role What if your expertise in high-performance C++ could directly shape the infrastructure that powers 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 validate next-generation models. This is a fully remote, flexible contract role for an experienced systems engineer who wants to do meaningful, high-impact work 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 that power AI data pipelines and evaluation workflows • Develop backend services and tooling for large-scale data annotation, validation, and quality control • Improve reliability, performance, and correctness across existing C++ codebases • Identify bottlenecks and edge cases in data and system behavior, and implement scalable solutions • Collaborate closely with data, research, and engineering teams to support model training and evaluation • Participate in synchronous design reviews to iterate on system architecture and implementation decisions Who You Are • 5+ years of professional experience writing production-grade C++ • Strong background in asynchronous network programming — event loops, RPC frameworks, or high-performance microservices • Experience working with high-throughput databases or message queues • Native or fluent English speaker with clear written and verbal communication skills • Able to commit 20–40 hours per week with consistency and reliability • Self-directed and comfortable operating in fast-moving engineering environments 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 architecture or developer tooling • Background working alongside research teams or in AI-adjacent environments Why Join Us • Work directly with leading AI labs on production systems that matter • Fully remote — work from wherever you do your best work • Flexible hours with meaningful, high-impact engineering challenges • Contribute to the infrastructure that shapes how next-generation AI is built and evaluated • Potential for ongoing work and contract extension as projects evolve