Data Infrastructure Developer (C++)

About The RoleWhat if your systems programming expertise could directly shape the infrastructure powering the world's most advanced AI models? We're looking for a Senior C++ Engineer to design and build the high-performance data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on — from the ground up.This is a fully remote, flexible contract role for engineers who thrive on hard technical problems and want their work to matter at scale.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance C++ systems supporting large-scale AI data pipelines and evaluation workflowsDevelop full-stack tooling and backend services for 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 workflowsIdentify bottlenecks and edge cases in data and system behavior, and implement scalable, production-ready fixesParticipate in synchronous design reviews to iterate on system 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 formatsExperienced implementing zero-copy data exchange protocols for high-speed pipelinesSelf-directed and able to commit 20–40 hours per week in a remote environmentNice to HavePrior experience with data annotation, data quality, or evaluation systemsFamiliarity with AI/ML workflows, model training, or benchmarking pipelinesExperience with distributed systems or developer toolingWhy Join UsWork on real production systems at the frontier of AI — not toy projectsCollaborate directly with leading AI research labs on high-impact infrastructureFully remote and flexible — work when and where you do your best workFreelance autonomy with the substance of meaningful, technically demanding workPotential for ongoing work and contract extension as new projects launch