Senior C# Full-Stack Engineer - AI Data & Infra (Remote)

Alignerr Corp.; Seattle (WA); Remote; USD 83,000 - 138,000; Part time

Benefits offered by this job

Fully remote

Freelance autonomy

Flexible schedule

Job summary

Alignerr is seeking a Senior C# Full-Stack Engineer for a fully remote hourly contract. The role focuses on building and optimizing data pipelines, annotation tooling, and evaluation systems used by AI research teams. Expect 20–40 hours per week with production impact and high technical depth.

You will collaborate with data, research, and engineering teams, tackling performance, concurrency, and memory-safety challenges while delivering scalable, production-ready solutions.

Qualifications

• 3–5+ years professional production C# experience.
• Strong systems programming background with focus on performance.

Responsibilities

• Design, build, and optimize high-performance C# systems for AI data pipelines and evaluation workflows.
• Develop full-stack tooling and backend services for large-scale data annotation and quality control.
• Improve reliability, performance, and memory safety across codebases.
• Collaborate with data, research, and engineering teams to support model training workflows.
• Identify bottlenecks and implement scalable, production-ready fixes.
• Participate in design reviews to iterate on architecture decisions.

Skills

C#

Full-stack

Performance optimization

Concurrency

Job description

Alignerr is seeking a Senior C# Full-Stack Engineer for a fully remote hourly contract. The role focuses on building and optimizing data pipelines, annotation tooling, and evaluation systems used by AI research teams. Expect 20–40 hours per week with production impact and high technical depth.

You will collaborate with data, research, and engineering teams, tackling performance, concurrency, and memory-safety challenges while delivering scalable, production-ready solutions.