Full Stack Developer; Backend

Overview

At the Green Energy Advice Bureau (GEAB), we are passionate about driving the transition to a more sustainable future. As a leading consultancy in the renewable energy sector, we empower customers through innovative technology that supports smarter energy decisions. Our internal platforms and data-driven products play a key role in delivering efficient, compliant, and scalable energy solutions. Our values underpin everything we do and guide how we build, collaborate, and innovate.

Job Overview:

We are delighted to be recruiting for a Full Stack Developer (Backend Focused) to join our growing development team.

This position is central to the ongoing development, stability, and modernisation of Phoenix
, our internal platform, as well as the integrations that support our wider business operations.

This is a hands-on role suited to a developer who enjoys taking ownership from concept through to delivery. You will contribute to architectural decisions, work with legacy systems, and help shape the technical direction of our products in a regulated environment where accuracy and reliability are essential.

• Designing, building, and maintaining backend services using Python
• Working across the full stack, with a stronger focus on backend development
• Building and integrating RESTful APIs, including third-party integrations
• Writing, optimising, and maintaining SQL queries to support data-driven features
• Contributing to system architecture and technical decision-making
• Refactoring and modernising legacy codebases in a structured, incremental way
• Identifying, prioritising, and addressing technical debt to improve long-term system quality
• Owning features end-to-end, from initial concept through to production delivery
• Ensuring systems meet the standards required in a regulated industry, with a strong focus on accuracy and compliance
• Collaborating closely with developers, product stakeholders, and wider teams to deliver high-quality solutions
• Strong experience developing backend systems using Python
• Confident working with SQL
  , including query optimisation and data integrity
• Hands-on experience with cloud platforms, preferably AWS (GCP experience considered)
• Full stack development experience, with a clear strength on the backend
• Working knowledge of Type Script and Node.js
• Experience building and consuming RESTful APIs
• Ability to contribute to and influence technical and architectural decisions
• Comfortable working with and improving legacy codebases
• Experience identifying and managing technical debt
• Strong sense of ownership, with the ability to manage work independently and see tasks through to completion
• Experience working in a regulated environment (energy, finance, healthcare, or similar)
• An interest in classical machine learning
  , with an understanding of how it can be applied to real-world problems
• Familiarity with QA processes
  , testing strategies, or test automation
• Experience with Test-Driven Development (TDD)

• Office based or hybrid working considered, with occasional visits to the office
• Professional and Personal Development Scheme
• Amazing perks including up to £40 off your home broadband
• A supportive, collaborative team and a phenomenal office culture