C++ Backend Engineer - AI Data Platforms

C++ Backend Engineer - AI Data Platforms$50-75/hr Remote Freelance CODINGAbout 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 to train and improve next-generation models.This is a fully remote, flexible contract role for a seasoned C++ engineer who thrives on performance-critical systems and wants their work to have real, lasting impact on the AI landscape.What You'll DoDesign, build, and optimize high-performance C++ systems that power AI data pipelines and model evaluation workflowsDevelop backend services and full-stack tooling supporting large-scale data annotation, validation, and quality controlImprove reliability, safety, and throughput across existing production C++ codebasesIdentify and resolve bottlenecks, edge cases, and failure modes in complex distributed systemsCollaborate closely with data, research, and engineering teams to accelerate model training and evaluationParticipate in synchronous design reviews and contribute to architectural decisions that shape the platformWho You AreNative or fluent English speaker with clear written and verbal communication skills5+ years of professional experience writing production-grade C++Strong background in asynchronous network programming — event loops, RPC frameworks, and high-performance microservicesExperienced with high-throughput databases or message queuesFull-stack developer mindset with a deep systems programming foundationAble to commit 20–40 hours per week with consistency and reliabilityNice to HavePrior experience with data annotation platforms, data quality systems, or model evaluation infrastructureFamiliarity with AI/ML workflows, model training pipelines, or benchmarking systemsExperience with distributed systems architecture or internal developer toolingWhy Join UsWork on real production systems for leading AI research labs — not toy projectsFully remote and async-friendly — work from wherever you do your best workFlexible contract hours that fit around your life and other commitmentsContribute to infrastructure that directly shapes how the next generation of AI models is built and evaluatedPotential for ongoing work and contract extension as projects grow and evolve