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Senior C# Full-Stack Engineer — AI Data & Infrastructure
Alignerr
New York, NY
About The Role What if your C# expertise could directly shape the infrastructure powering next-generation AI? We're looking for a Senior C# ...
$50.00 – $75.00/hr Apply Now
Senior Rust Engineer — AI Data & Infrastructure
Alignerr
Seattle, WA
About The Role What if your systems programming expertise could directly shape the infrastructure behind some of the world's most advanced A...
$50.00 – $75.00/hr Apply Now
Data Science Expert - AI Content Specialist
Alignerr
Denver, CO
Position Overview Fully remote, flexible contract role for experienced data scientists to work with leading AI research labs at Alignerr. ...
$40.00 – $80.00/hr Apply Now
Data Infrastructure Developer (C++)
Alignerr
Seattle, WA
About The Role What if your systems programming expertise could directly shape the infrastructure powering the world's most advanced AI mode...
$50.00 – $75.00/hr Apply Now
Data Infrastructure Developer (C++)
Alignerr
Denver, CO
About The Role What if your deep C++ expertise could directly shape the infrastructure that powers the world's most advanced AI systems? We'...
$50.00 – $75.00/hr Apply Now
Research Scientist
Hedra
San Francisco, CA
Position Overview Hedra is building a world-class Physical AI research team to push the boundaries of action-conditioned world models and ge...
$200k – $325k/year Apply Now
Research Scientist
Hedra
San Francisco, CA
Hedra is building a world-class Physical AI research team to push the boundaries of action-conditioned world models and generative AI for phy...
$200k – $325k/year Apply Now
Senior, Data Scientist
Walmart
Sunnyvale, CA
Position Overview Commercialization Platforms and Enablement B2B Team at Walmart Global Tech is a group of data scientists, analysts, and en...
$117k – $234k/year Apply Now
Data Scientist III
Walmart
Sunnyvale, CA
Position Overview Commercialization Platforms and Enablement B2B Team at Walmart Global Tech is a group of data scientists, analysts, and en...
$117k – $234k/year Apply Now
(USA) Senior, Data Scientist
Walmart
Sunnyvale, CA
Position Overview Walmart Global Tech is seeking a Senior Data Scientist to join the Personalization team in Sunnyvale, focusing on developi...
$117k – $234k/year Apply Now
Senior C# Full-Stack Engineer — AI Data & Infrastructure

About The Role What if your C# expertise could directly shape the infrastructure powering next-generation AI? We're looking for a Senior C# Full-Stack Engineer to build and optimize the sy...

$50.00 – $75.00/hr Apply Now

About The Role
  • What if your C# expertise could directly shape the infrastructure powering next-generation AI? We're looking for a Senior C# Full-Stack Engineer to build and optimize the systems that leading AI labs depend on --- from data pipelines and annotation tooling to evaluation infrastructure that influences how frontier models are trained and assessed.
  • This is a fully remote contract role with meaningful technical challenges, real production impact, and the flexibility to work on your own terms.
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 at scale
  • Improve reliability, performance, and safety across existing C# codebases
  • Collaborate with data, research, and engineering teams to support 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 strong written and verbal communication skills
  • Experienced full-stack developer with a solid systems programming foundation
  • 3--5+ years of professional experience writing production C# code, with command of modern standards
  • Deep understanding of performance optimization, concurrency (threading, atomics), and memory safety (RAII, smart pointers, sanitizers)
  • Able to commit 20--40 hours per week with reliability and consistency
  • Self-directed and comfortable working in fast-moving, async-first environments
Nice to Have
  • Prior experience with data annotation pipelines, data quality systems, or evaluation infrastructure
  • Familiarity with AI/ML workflows, model training loops, or benchmarking pipelines
  • Experience building distributed systems or developer tooling at scale
Why Join Us
  • Work directly with leading AI labs on systems that influence how frontier models are built
  • Tackle genuinely hard engineering problems --- not maintenance tickets
  • Fully remote and flexible --- structure your week around your best work
  • Freelance autonomy with the substance of high-impact engineering work
  • Potential for ongoing contracts and expanded scope as projects grow
Responsibilities
  • Engineering and Information Technology
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