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4,211

Full Stack Developer jobs in United Kingdom

Backend Developer - AI Data Services

Labelbox

United Kingdom
Remote
GBP 80,000 - 100,000
30+ days ago
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Software Development Engineer II

Traveltechessentialist

United Kingdom
On-site
GBP 50,000 - 70,000
30+ days ago

Senior Backend Engineer (C#) - AI Data Platform

Labelbox

United Kingdom
Remote
GBP 80,000 - 100,000
30+ days ago

Software Development Engineer II - Full Stack (UI Focussed)

Tesco UK

Welwyn Garden City
Hybrid
GBP 45,000 - 65,000
30+ days ago

Logistics Software Engineer

Gold Group

Havant
On-site
GBP 51,000 - 60,000
30+ days ago
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Logistics Software Engineer

Gold Group Limited

Havant
On-site
GBP 45,000 - 70,000
30+ days ago

Software Engineer (Components Team)

Scottish Government

Glasgow
Hybrid
GBP 40,000 - 60,000
30+ days ago

Software Engineer - Remote

Lottie

City Of London
Hybrid
GBP 60,000 - 80,000
30+ days ago
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Software Engineer, Codex for Teams

OpenAI

City Of London
On-site
GBP 80,000 - 100,000
30+ days ago

Staff Software Engineer (Team Lead) - Engine by Starling

Starling Bank

Greater London
Hybrid
GBP 70,000 - 90,000
30+ days ago

Staff Full-Stack Engineer: Build Next-Gen Features

Java Script Works

United Kingdom
On-site
GBP 60,000 - 80,000
30+ days ago

Remote Working Software Developer - UK Only

SPECTRUM IT

Devon and Torbay
Remote
GBP 40,000 - 60,000
30+ days ago

Staff Software Engineer (Team Lead) - Engine by Starling

Starling Bank

Southampton
On-site
GBP 70,000 - 90,000
30+ days ago

Software Engineer II - Gateway

FreedomPay

City Of London
Hybrid
GBP 60,000 - 80,000
30+ days ago

Senior Software Engineer

Sideways 6

Manchester
On-site
GBP 50,000 - 70,000
30+ days ago

Back-End Developer

Summit Media Limited

United Kingdom
Hybrid
GBP 30,000 - 35,000
30+ days ago

Platform Software Developer

Viribus

City Of London
Hybrid
GBP 70,000 - 90,000
30+ days ago

Quantitative Software Developer

Aurora Energy Research Limited

Oxford
Hybrid
GBP 45,000 - 65,000
30+ days ago

Modelling Software Developer

Aurora Energy Research Limited

Oxford
Hybrid
GBP 40,000 - 60,000
30+ days ago

We're hiring! Python software developer

Scene Connect Ltd.

City of Edinburgh
On-site
GBP 45,000 - 55,000
30+ days ago

Experienced Software Developer

Mayden

Bath
Hybrid
GBP 40,000 - 60,000
30+ days ago

Mid Level Software Developer 55941

Kinetic Software

Ludlow
On-site
GBP 50,000 - 55,000
30+ days ago

Software Developer

Contract Personnel Limited

England
Hybrid
GBP 45,000 - 60,000
30+ days ago

Software Engineer / Software Developer - Typescript / Node / React

Gamma Recruitment Team

Manchester
On-site
GBP 100,000 - 125,000
30+ days ago

Senior Software Engineer

Dayshape

City of Edinburgh
Hybrid
GBP 50,000 - 60,000
30+ days ago

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Backend Developer - AI Data Services
Labelbox
Remote
GBP 80,000 - 100,000
Part time
30+ days ago

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

Fluent English
Full-stack development experience
C# programming
Data modeling
Database access using ORM
Clear communication skills
Job description
About the Job

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.

Position

Senior C# Full-Stack Engineer — AI Data & Infrastructure

Type: Contract, Remote | Commitment: 20–40 hours/week | Compensation: Competitive, hourly (based on experience)

Role Responsibilities
  • 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
Qualifications
Must-Have
  • 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
Preferred
  • 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
Application Process
  • Submit your resume
  • Complete a short technical screening
  • Project matching and onboarding
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* 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.

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