About the role
About The Role What if your C++ expertise could directly shape the infrastructure powering the next generation of AI? We're looking for a senior-level C++ engineer to build and optimize the high-performance data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve their models. This is a fully remote contract role with serious technical depth — real production systems, real impact, and the flexibility to work on your own terms. Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/week What You'll Do Design, build, and optimize high-performance C++ systems that power AI data pipelines and evaluation workflowsDevelop full-stack tooling and backend services for large-scale data annotation, validation, and quality controlImprove reliability, performance, and safety across existing C++ codebasesIdentify bottlenecks and edge cases in data and system behavior — then implement scalable, production-grade fixesCollaborate with data, research, and engineering teams to support model training and evaluation at scaleParticipate 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 skillsFull-stack developer with a strong systems programming background3–5+ years of professional experience writing production-grade C++Expert in efficient binary serialization formatsExperienced implementing zero-copy data exchange protocols for high-speed pipelinesAble to commit reliably to 20–40 hours per week Nice to Have Prior experience with data annotation, data quality systems, or evaluation pipelinesFamiliarity with AI/ML workflows, model training, or benchmarking infrastructureExperience with distributed systems or developer tooling Why Join Us Work on real production systems alongside top AI research labs — not toy projectsFully remote and flexible — work when and where it suits youFreelance autonomy with the structure of meaningful, ongoing technical workMake a direct, tangible impact on how the world's most advanced AI models are built and evaluatedPotential for ongoing work and contract extension as new projects launch
From the employer's public posting. AI Eval HQ isn't affiliated with Alignerr; you apply on their site.
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