C++ Developer - Internal Tooling & Optimization

C++ Developer — Internal Tooling & Optimization (AI Infrastructure)About The RoleWhat if your C++ skills 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, build, and optimize the high-performance tooling and data pipelines that leading AI labs depend on — from annotation systems to evaluation infrastructure.This is a fully remote, flexible contract role for experienced systems engineers who want meaningful, high-impact work on real production systems.Organization: AlignerrType: Hourly ContractLocation: RemoteCommitment: 20–40 hours/weekWhat You'll DoDesign, build, and optimize high-performance C++ systems supporting 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, and implement scalable fixesEmbed scripting languages within C++ applications to create flexible, extensible toolingCollaborate with data, research, and engineering teams to support model training and evaluation workflowsParticipate in synchronous design reviews to iterate on system architecture and implementation decisionsWho You Are3–5+ years of professional experience writing production-grade C++Strong full-stack developer with a solid systems programming foundationExperienced profiling and optimizing code to eliminate bottlenecks in data processing pipelinesSkilled at embedding scripting languages within C++ applicationsNative or fluent English speaker with clear written and verbal communication skillsAble to commit 20–40 hours per week with consistency and reliabilityNice 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 toolingBackground working alongside research or data science teamsWhy Join UsWork on cutting-edge AI infrastructure projects alongside leading research labsFully remote and flexible — work when and where it suits youFreelance autonomy with the structure of meaningful, high-impact engineering workContribute directly to systems that shape how next-generation AI models are built and evaluatedPotential for ongoing work and contract extension as new projects launchJ-18808-Ljbffr