Full Stack Developer jobs in United Kingdom
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Job summary
A leading AI solutions provider is seeking a Senior C# Full-Stack Engineer to develop high-performance systems for AI data management. The role includes building tools and services for data annotation and collaborating with interdisciplinary teams. The ideal candidate must have over 5 years of experience in C#, strong full-stack development skills, and the capacity to commit 20–40 hours per week. This is a competitive hourly contract role offered remotely from the United Kingdom.
Qualifications
- 5+ years of professional experience writing production C#.
- Strong systems programming background.
- Ability to commit 20–40 hours per week.
Responsibilities
- Design, build, and optimize high-performance systems in C#.
- Develop full-stack tooling and backend services for data annotation.
- Collaborate with teams to support model training workflows.
Skills
Alignerr connects top technical experts with leading AI labs to build, evaluate, and improve next-generation models. We work on real production systems and high-impact research workflows across data, tooling, and infrastructure.
Senior C# Full-Stack Engineer — AI Data & Infrastructure
Type: Contract, Remote | Commitment: 20–40 hours/week | Compensation: Competitive, hourly (based on experience)
- Design, build, and optimize high-performance systems in C# 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 bottlenecks and edge cases in data and system behavior, and implement scalable fixes
- Participate in synchronous reviews to iterate on system design and implementation decisions
- Native or fluent English speaker
- Full-stack developer experience with a strong systems programming background
- 5+ years of professional experience writing production C#
- Strong skills in data modeling and database access using ORM frameworks or micro-ORMs for high-performance SQL interactions
- Experience building secure, documented endpoints for data access and manipulation
- Clear written and verbal communication skills
- Ability to commit 20–40 hours per week
- 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
- Submit your resume
- Complete a short technical screening
- Project matching and onboarding
* The salary benchmark is based on the target salaries of market leaders in their relevant sectors. It is intended to serve as a guide to help Premium Members assess open positions and to help in salary negotiations. The salary benchmark is not provided directly by the company, which could be significantly higher or lower.