Data Infrastructure Developer (C++)

About The RoleWhat 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: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance C++ systems that power AI data pipelines and evaluation workflowsDevelop full-stack tooling and backend services supporting large-scale data annotation, validation, and quality controlImprove reliability, performance, and safety across existing C++ codebasesCollaborate with data, research, and engineering teams to support model training and evaluation at scaleIdentify bottlenecks and edge cases in data and system behavior — then implement scalable, production-ready fixesParticipate in synchronous design reviews to iterate on architecture and implementation decisionsWho You AreNative 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++Deep expertise in efficient binary serialization formatsHands-on experience implementing zero-copy data exchange protocols for high-speed pipelinesAble to commit 20–40 hours per week with reliability and professionalismNice to HavePrior experience with data annotation, data quality pipelines, or evaluation systemsFamiliarity with AI/ML workflows, model training, or benchmarking infrastructureBackground in distributed systems or developer toolingWhy Join UsWork directly with leading AI labs on real production systems — not toy projectsFully remote and flexible — work from anywhere on a schedule that suits youFreelance autonomy with the structure of meaningful, high-stakes engineering workMake a tangible impact on the infrastructure shaping the future of AIPotential for ongoing work and contract extension as projects scale