Full Stack Engineer

12-month initial contract with extensions I m looking for an experienced Full-Stack Developer to join a technology team building modern, production-grade applications with React, Python and Generative AI at their core. This is a genuinely hands-on engineering role for someone who enjoys working across the stack building polished frontend experiences, designing robust backend services and APIs, and developing applications that integrate LLMs, tools and AI agents . You won t simply be maintaining existing applications. You ll be helping shape and build new digital products where traditional software engineering meets the rapidly evolving world of LLM-powered applications and agentic AI .

What You ll Be Doing:

• Design and develop production-grade full-stack applications using React.js and Python
• Build modern, responsive frontend applications with React
• Develop scalable backend services using Python and FastAPI
• Design and build robust REST APIs , including authentication and API versioning
• Build applications incorporating Large Language Models (LLMs)
• Develop and implement prompting, tool-use and agent-based application patterns
• Integrate AI capabilities into real-world products and workflows
• Work across the full software development lifecycle, from design and architecture through to production
• Collaborate with product, engineering and other technical stakeholders to turn requirements into scalable solutions
• Maintain strong engineering standards around performance, reliability and maintainability

What We re Looking For:

• 6+ years of full-stack development experience
• Strong, production-level React.js experience
• Strong backend development experience with Python
• Hands-on experience with FastAPI
• Strong API development experience, particularly REST API design
• Good understanding of authentication and API versioning
• Practical experience building applications using LLMs
• Understanding of modern LLM application patterns including prompts, tools and agents
• Comfortable owning features across both frontend and backend development
• Strong software engineering fundamentals and a product-focused mindset

Core Technology

• Frontend: React.js
• Backend: Python, FastAPI
• APIs: REST, Authentication, API Versioning
• AI / LLM: Large Language Models, Prompt Engineering, Tool Use, AI Agents

Why This Role?

This is a great opportunity for an experienced full-stack engineer who wants to move beyond traditional web development and work on products where AI is an integral part of the application architecture . Salt is acting as an Employment Business in relation to this vacancy.

Desired Candidate Profile

What We re Looking For:

• 6+ years of full-stack development experience
• Strong, production-level React.js experience
• Strong backend development experience with Python
• Hands-on experience with FastAPI
• Strong API development experience, particularly REST API design
• Good understanding of authentication and API versioning
• Practical experience building applications using LLMs
• Understanding of modern LLM application patterns including prompts, tools and agents
• Comfortable owning features across both frontend and backend development
• Strong software engineering fundamentals and a product-focused mindset