Senior Fullstack Engineer

La Fosse Associates; Greater London; Hybrid; GBP 85,000 - 100,000; Full time

Job summary

A tech-first sustainability company is looking for a Senior Full Stack Engineer to join its high-performing team. This role offers a hybrid work model, requiring only 2 days in the office each week in London or Bristol. You will be involved in building new features and improving systems in a fast-paced environment. Ideal candidates will have strong skills in JavaScript, TypeScript, and React, and should be comfortable working in an agile setting. The position provides a competitive salary ranging from £85k to £100k per annum.

Qualifications

• Familiarity with modern coding practices and agile methodologies.
• Experience in product-focused environments is a plus.

Responsibilities

• Contribute across the stack by building new features.
• Improve existing systems in a fast-moving product-led environment.

Skills

JavaScript & TypeScript

React

Node.js

Experience building and consuming APIs

Strong problem-solving skills and collaborative mindset

Job description

Overview

Senior Full Stack Engineer | £85k – £100k per annum | Hybrid (2 days per week in office – London or Bristol)

A tech-first sustainability company is looking to add a Senior Full Stack Engineer to its high-performing engineering team. You will be joining a small, highly skilled team working on modern, scalable software that’s helping to redefine the heat pump and clean energy space. This is a hands-on role where you’ll contribute across the stack, building new features and improving existing systems in a fast-moving, product-led environment. The team operates with strong engineering principles, values clean code and collaboration, and offers engineers real ownership over their work. You’ll be comfortable working in an agile environment and collaborating closely with other engineers, product, and design.

Essential Skills

• JavaScript & TypeScript
• React
• Node.js
• Experience building and consuming APIs
• Strong problem-solving skills and collaborative mindset

Desirable

• Experience working in product-focused or startup environments
• Exposure to cloud platforms (AWS/GCP/Azure)
• Interest in climate tech or impactful, real-world software
• Side projects

Location & Eligibility

This is a hybrid role, requiring 2 days per week in either the London or Bristol office. The role is open to UK-based applicants only, and you must have the right to work in the UK.

Interview process

2–3 stages, including a technical discussion and a practical/technical interview.

If this role sounds of interest, please reply with your updated CV, and I’ll be happy to share more details.