Alignerr

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Backend Developer - AI Data Services

Alignerr

Manhattan, NY โ€ข On-site

Other

Posted 7 days ago


Job description

Backend Developer - AI Data Services
About the Role
What if your C# expertise could directly shape the infrastructure powering next-generation AI? We're looking for a seasoned C# engineer to build and optimize the data pipelines, annotation tooling, and evaluation systems that leading AI labs depend on to train and improve their models.
This is a fully remote contract role working on real production systems - not toy projects. You'll collaborate with data, research, and engineering teams at the frontier of AI development, solving hard infrastructure problems that have a direct impact on how the world's most advanced models are built.
  • 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 AI data pipelines and model evaluation workflows
  • Develop full-stack tooling and backend services for large-scale data annotation, validation, and quality control
  • Improve reliability, performance, and correctness across existing C# codebases
  • Collaborate closely with data, research, and engineering teams to accelerate model training and evaluation workflows
  • Identify bottlenecks and edge cases in data and system behavior - then implement scalable, production-ready fixes
  • Participate in synchronous design reviews to iterate on architecture and implementation decisions
Who You Are
  • Native or fluent English speaker with clear written and verbal communication skills
  • Full-stack developer with a strong systems programming foundation and 5+ years of professional C# experience
  • Skilled in data modeling and database access - including ORM frameworks and micro-ORMs for high-performance SQL interactions
  • Experienced building secure, well-documented APIs and endpoints for data access and manipulation
  • Able to commit reliably to 20-40 hours per week on an ongoing basis
  • Self-directed and comfortable working asynchronously across a remote-first environment
Nice to Have
  • Prior experience with data annotation platforms, data quality systems, or model evaluation pipelines
  • Familiarity with AI/ML workflows, model training infrastructure, or benchmarking systems
  • Experience with distributed systems, developer tooling, or high-throughput data processing
Why Join Us
  • Work directly with leading AI research labs on production systems that matter
  • Fully remote and flexible - structure your work around your schedule
  • Freelance autonomy with the substance of meaningful, technically challenging work
  • Contribute to infrastructure that shapes how next-generation AI models are built and evaluated
  • Potential for ongoing work and contract extension as projects grow and evolve