Data Infrastructure Developer (C++)
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++ 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 or developer tooling Why Join Us - Work directly with leading AI research labs on high-impact production systems - Fully remote and flexible — structure your work around your life - Freelance autonomy with the substance of meaningful, technically challenging work - Contribute to infrastructure that shapes how next-generation AI models are developed - Potential for ongoing work and contract extension as projects scale
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