Senior C# Full-Stack Engineer for AI Data Pipelines (Remote)

Alignerr; United Kingdom; On-site; GBP 83,000 - 165,000; Part time

Job summary

Alignerr is seeking a Senior C# Full-Stack Engineer to design and optimize data pipelines, annotation tooling, and evaluation systems used by leading AI labs. This fully remote hourly contract offers 20–40 hours per week, flexible hours, and the chance to work at the frontier of AI development.

You will build high-performance C# systems, collaborate with research and engineering teams, and tackle production-readiness challenges with a focus on reliability and memory safety.

Qualifications

• 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# (modern standards preferred).
• Deep understanding of performance optimization, concurrency (threading, atomics), and memory safety.
• Methodical problem-solver who thrives in fast-moving, high-stakes technical environments.
• Able to commit 20–40 hours per week with reliability and professionalism.

Responsibilities

• 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 production 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, and implement scalable, production-ready fixes.
• Participate in synchronous design reviews to iterate on architecture and implementation decisions.

Skills

C#

Full-stack development

Performance optimization

Concurrency

Memory safety

English communication

Job description

Alignerr is seeking a Senior C# Full-Stack Engineer to design and optimize data pipelines, annotation tooling, and evaluation systems used by leading AI labs. This fully remote hourly contract offers 20–40 hours per week, flexible hours, and the chance to work at the frontier of AI development.

You will build high-performance C# systems, collaborate with research and engineering teams, and tackle production-readiness challenges with a focus on reliability and memory safety.