Backend Developer - AI Data Services

Alignerr; United States; Remote; GBP 83,000 - 131,000; Part time

Benefits offered by this job

Fully remote

Flexible hours

Contract-based engagement

Job summary

Alignerr is seeking a Senior C# Full-Stack Engineer to design and optimize data pipelines, annotation tooling, and evaluation systems for AI labs. This remote, hourly contract role requires 20–40 hours per week and emphasizes collaboration with data, research, and engineering teams to support model training and evaluation workflows.

You will work on high-performance C# systems, full-stack tooling, and production-ready solutions across distributed data environments while maintaining security and

Qualifications

• 5+ years of professional experience writing production-quality C#.
• Strong background in full-stack development and systems programming.
• Experience designing and optimizing data pipelines, annotation tooling, and evaluation systems.

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 production C# codebases.

Skills

C# production-grade

Full-Stack development

Systems programming

ORM / micro-ORM

Data modeling

SQL performance

Security

Job description

About The Role

What if your C# expertise could directly shape the infrastructure powering the next generation of AI? We're looking for a Senior C# Full-Stack 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.

• 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 used in production AI environments
• 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 clear written and verbal communication skills
• Full-Stack developer with a strong systems programming background
• 5+ years of professional experience writing production-quality C#
• Skilled in data modeling and database access using ORM frameworks or micro-ORMs for high-performance SQL interactions
• Experienced building secure, well-documented endpoints for data access and manipulation
• Able to commit 20–40 hours per week consistently

Nice to Have

• Prior experience with data annotation, data quality pipelines, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking infrastructure
• Experience with distributed systems or developer tooling at scale

Why Join Us

• Work on real production systems alongside leading AI research labs — not toy projects
• Fully remote and async-friendly — work from wherever you do your best work
• Freelance autonomy with the structure of meaningful, ongoing technical collaboration
• Make a direct, tangible impact on how next-generation AI models are built and evaluated
• Potential for ongoing work and contract extension as new projects launch