Senior Full-Stack Engineer (On-site, .NET/React/Python)

Kofeko; Test Valley; On-site; GBP 60,000 - 90,000; Full time

Job summary

Kofeko in the United Kingdom is seeking a Senior Full Stack Developer to build and maintain end-to-end features across .Net backend, React frontend, and Python helpers where needed.

You will own design and delivery of robust software, collaborating across teams, and ensuring reliable database integration while delivering maintainable code and high-quality user experiences. This on-site role requires hands-on coding, refactoring for maintainability, and proactive troubleshooting to reduce defects.

Qualifications

• 5+ years in a full-stack development role.
• Strong .Net backend development capability.
• Proficient with React and JavaScript for frontend, and Python when needed.

Responsibilities

• Designing and implementing full-stack features, from backend logic to frontend user experience.
• Backend development using .Net, including API and service implementation.
• Frontend development using React and JavaScript, translating requirements into working UI components.
• Python development tasks where required (supporting services, scripts, or integrations).
• Database integration work, including implementing, updating, and troubleshooting application-to-database interactions.
• Diagnosing and resolving defects across the stack, across frontend, backend, and database layers.
• Improving code structure and maintainability as part of ongoing feature development and change work.

Skills

.Net development

React

JavaScript

Python

Database integration

On-site work

Full-stack delivery

Tools

Git

API design

Job description

Kofeko in the United Kingdom is seeking a Senior Full Stack Developer to build and maintain end-to-end features across .Net backend, React frontend, and Python helpers where needed.

You will own design and delivery of robust software, collaborating across teams, and ensuring reliable database integration while delivering maintainable code and high-quality user experiences. This on-site role requires hands-on coding, refactoring for maintainability, and proactive troubleshooting to reduce defects.