Senior C++ Full-Stack Engineer: AI Data & Infrastructure

* Design, build, and optimize high-performance C++ systems supporting large-scale AI data pipelines and evaluation workflows * Develop full-stack tooling and backend services for data annotation, validation, and quality control * Improve reliability, performance, and safety across production C++ codebases * Identify and resolve bottlenecks and edge cases in data and system behavior — then ship scalable fixes * Collaborate with data, research, and engineering teams to support model training and evaluation workflows * Participate in synchronous design reviews to iterate on architecture and implementation decisions

Who You Are

* 3–5+ years of professional experience writing production-grade C++, with a strong focus on modern standards (C++17 or C++20) * Deep systems programming background — you're comfortable with performance optimization, concurrency (threading, atomics), and memory safety (RAII, smart pointers, sanitizers) * Full-stack developer with experience across backend services and tooling, not just low-level systems * Clear, confident communicator — written and verbal — who can engage effectively with cross-functional teams * Native or fluent English speaker * Able to commit 20–40 hours per week consistently

Nice to Have

* Prior experience with data annotation systems, data quality pipelines, or evaluation infrastructure * Familiarity with AI/ML workflows, model training, or benchmarking systems * Experience with distributed systems or developer tooling at scale

Why Join Us

* Work directly with leading AI labs on production systems that matter * Fully remote and flexible — work when and where it suits you * Freelance autonomy with the structure of impactful, high-caliber engineering work * Collaborate with top technical experts across data, research, and infrastructure * Potential for ongoing work and contract extension as new projects launch