C++ Backend Engineer - AI Data Platforms

About this role

C++ Backend Engineer — AI Data Platforms
About The Role
What if your expertise in high-performance C++ could directly shape the infrastructure that powers the world's most advanced AI systems? We're looking for a senior C++ engineer to design and build the data pipelines, annotation tooling, and evaluation infrastructure that leading AI labs depend on to train and validate next-generation models.


This is a fully remote, flexible contract role for an experienced systems engineer who wants to do meaningful, high-impact 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 that power AI data pipelines and evaluation workflows
• Develop backend services and tooling for large-scale data annotation, validation, and quality control
• Improve reliability, performance, and correctness across existing C++ codebases
• Identify bottlenecks and edge cases in data and system behavior, and implement scalable solutions
• Collaborate closely with data, research, and engineering teams to support model training and evaluation
• Participate in synchronous design reviews to iterate on system architecture and implementation decisions

Who You Are

• 5+ years of professional experience writing production-grade C++
• Strong background in asynchronous network programming — event loops, RPC frameworks, or high-performance microservices
• Experience working with high-throughput databases or message queues
• Native or fluent English speaker with clear written and verbal communication skills
• Able to commit 20–40 hours per week with consistency and reliability
• Self-directed and comfortable operating in fast-moving engineering environments

Nice to Have

• Prior experience with data annotation, data quality pipelines, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmar...