Software Engineer (C#) - Internal Tooling

Alignerr Corp.; Denver (CO); Remote; USD 83,000 - 152,000; Full time

Job summary

Alignerr Corp. is seeking a Software Engineer (C#) for internal tooling in AI infrastructure.

This fully remote hourly contract role involves building and optimizing data pipelines, evaluation harnesses, and quality control tooling used by leading AI labs. You will collaborate with data, research, and engineering teams to design robust C# systems, develop full-stack tooling, and improve reliability and performance across codebases while supporting model training workflows.

Qualifications

• 3–5+ years of production-grade C# experience.
• Strong full-stack background with solid systems programming fundamentals.
• English communication skills, written and spoken.

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, validation, and quality control.
• 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 with scalable solutions.
• Participate in synchronous design reviews to iterate on architecture and implementation decisions.
• Build and maintain robust benchmarking and performance evaluation harnesses.

Skills

C#

Full-stack development

Systems programming

Interoperability with Python/.NET

Benchmarking experience

English communication

20–40 hours/week commitment

Tools

Python interop

NET interop

Native library wrappers

Job description

Software Engineer (C#) — Internal Tooling (AI Infrastructure)

About The Role

What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for experienced full-stack C# engineers to build and improve the systems that leading AI labs depend on — from data annotation pipelines to evaluation harnesses and quality control tooling.

This is a fully remote contract role with flexible commitment. You'll work on real production systems alongside data, research, and engineering teams 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 AI data pipelines and evaluation workflows
• Develop full-stack tooling and backend services for large-scale data annotation, validation, and quality control
• Improve reliability, performance, and safety across existing C# codebases
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Identify and resolve bottlenecks and edge cases in data and system behavior with scalable solutions
• Participate in synchronous design reviews to iterate on architecture and implementation decisions
• Build and maintain robust benchmarking and performance evaluation harnesses

Who You Are

• 3–5+ years of professional experience writing production-grade C#
• Strong full-stack developer background with solid systems programming fundamentals
• Expertise in interoperability scenarios — such as invoking Python ML models from .NET or wrapping native libraries
• Experienced designing robust harnesses for benchmarking and evaluating system performance
• Native or fluent English speaker with clear written and verbal communication skills
• Able to commit 20–40 hours per week with reliability and consistency

Nice to Have

• Prior experience with data annotation, data quality, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems or developer tooling
• Background working with or alongside research teams in a fast-moving environment

Why Join Us

• Work on cutting-edge AI projects alongside leading research labs
• Fully remote and flexible — work when and where it suits you
• Freelance autonomy with the structure of meaningful, high-impact technical work
• Build systems that directly influence how next-generation AI models are trained and evaluated
• Potential for ongoing work and contract extension as new projects launch