About The Role What if your deep C++ expertise could directly shape the infrastructure that powers the world's most advanced AI systems? We're looking for a Senior C++ Full-Stack Engineer to build and optimize the high-performance data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on every day. This is a fully remote contract role with serious technical depth — real production systems, meaningful engineering challenges, and direct collaboration with top AI research teams. 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 supporting 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 at scale 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 Full-stack developer with a strong systems programming background 3–5+ years of professional experience writing production-grade C++ Deep expertise in efficient binary serialization formats Hands-on experience implementing zero-copy data exchange protocols for high-speed pipelines Able to commit 20–40 hours per week with reliability and professionalism

Nice to Have

Prior experience with data annotation, data quality pipelines, or evaluation systems Familiarity with AI/ML workflows, model training, or benchmarking infrastructure Background in distributed systems or developer tooling

Why Join Us

Work directly with leading AI labs on real production systems — not toy projects Fully remote and flexible — work from anywhere on a schedule that suits you Freelance autonomy with the structure of meaningful, high-stakes engineering work Make a tangible impact on the infrastructure shaping the future of AI Potential for ongoing work and contract extension as projects scale