About the Role
What if your mastery of C++ could directly shape the infrastructure powering the world's most advanced AI systems? We're looking for a Senior C++ Full-Stack Engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on — working on real production code with genuine, measurable impact.
This is a fully remote, flexible contract role for a seasoned systems engineer who wants to do meaningful work at the frontier of AI development.
- Organization: Alignerr
- Type: Hourly Contract
- Location: Remote
- Commitment: 20–40 hours/week
What You'll Do
- Design, build, and optimize high-performance C++ systems supporting large-scale AI data pipelines and evaluation workflows
- Develop full-stack tooling and backend services for data annotation, validation, and quality control
- Improve reliability, performance, and safety across production C++ codebases
- Identify and resolve bottlenecks and edge cases in data and system behavior — then ship scalable fixes
- Collaborate with data, research, and engineering teams to support model training and evaluation workflows
- Participate in synchronous design reviews to iterate on architecture and implementation decisions
Who You Are
- 3–5+ years of professional experience writing production-grade C++, with a strong focus on modern standards (C++17 or C++20)
- Deep systems programming background — you're comfortable with performance optimization, concurrency (threading, atomics), and memory safety (RAII, smart pointers, sanitizers)
- Full-stack developer with experience across backend services and tooling, not just low-level systems
- Clear, confident communicator — written and verbal — who can engage effectively with cross-functional teams
- Native or fluent English speaker
- Able to commit 20–40 hours per week consistently
Nice to Have
- Prior experience with data annotation systems, data quality pipelines, or evaluation infrastructure
- Familiarity with AI/ML workflows, model training, or benchmarking systems
- Experience with distributed systems or developer tooling at scale
Why Join Us
- Work directly with leading AI labs on production systems that matter
- Fully remote and flexible — work when and where it suits you
- Freelance autonomy with the structure of impactful, high-caliber engineering work
- Collaborate with top technical experts across data, research, and infrastructure
- Potential for ongoing work and contract extension as new projects launch