Data Infrastructure Developer (C++)

Data Infrastructure Developer (C++) 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++ Full-Stack Engineer to design and build high-performance data pipelines, annotation tooling, and evaluation infrastructure used by leading AI research labs. This is a fully remote contract role with flexible hours. You'll work on real production systems — not toy projects — and your contributions will have a direct, measurable impact on how next-generation AI models are built and evaluated. 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 full-stack tooling and backend services for large-scale data annotation, validation, and quality control Improve reliability, performance, and correctness across production C++ codebases Collaborate with data, research, and engineering teams to support model training and evaluation at scale Identify bottlenecks and edge cases in system behavior and implement scalable, robust solutions Participate in synchronous design and code reviews to iterate quickly on architecture and implementation Who You Are Native or fluent English speaker with strong written and verbal communication skills Full-stack developer with a deep systems programming background 3–5+ years of professional experience writing production-grade C++ Expert-level understanding of efficient binary serialization formats Experienced with zero-copy data exchange protocols for high-speed data pipelines Able to commit 20–40 hours per week with consistency and reliability Nice to Have Prior experience with data annotation, data quality, or model evaluation systems Familiarity with AI/ML workflows, model training pipelines, or benchmarking infrastructure Experience building or maintaining distributed systems o