Senior Founding Engineer

Founding Engineer (EnergyTech / AI)

London | Hybrid (3 days onsite) | £70k-£120k + Equity

A venture-backed EnergyTech start-up is building a new type of power company designed for the electrified future.

As renewable energy adoption accelerates, the challenge is no longer just generating power, but storing, managing, and intelligently dispatching it. This team is developing software that sits at the centre of that transition, enabling a new generation of energy suppliers built around flexibility, storage, and intelligent automation.

Backed by leading investors and founded by operators with experience from some of the most respected names in the European energy ecosystem, the business has already launched its first product and is growing rapidly month-on-month. The next phase is building the core technology platform that will power a fully integrated energy supplier launching later this year.

This is an opportunity to join a small, highly capable engineering team building core infrastructure for a next-generation energy platform.

The Role

You will work across the full product stack, helping design and build the systems that power both the customer experience and the operational backbone of the platform.

Engineers here take ownership of problems end-to-end, from shaping early ideas through to delivering production features used by customers.

Responsibilities include:

Building full-stack product features across web, backend services and data systems

Designing APIs and integrating with hardware and energy data platforms

Developing AI-enabled capabilities, including LLM-powered workflows and operational tooling

Contributing to core supplier infrastructure such as billing systems, operational tooling, and internal platforms

Working closely with founders and customers to shape the product direction

Tech Stack

Frontend: React, React Native, TypeScript

Backend: Python, FastAPI, PostgreSQL

Infrastructure: GCP, Terraform, Airflow

AI: LLM integrations and AI-driven automation

What They're Looking For

Experience as a Full-Stack Engineer building production systems

Strong engineering fundamentals and the ability to work across backend and frontend systems

Comfort operating in a fast-moving start-up environment where priorities evolve quickly

A proactive mindset with a bias towards ownership and solutions

Interest in the energy transition or climate technology is a strong plus

Engineers who thrive here tend to enjoy working close to the problem, communicating clearly across technical and non-technical teams, and taking initiative rather than waiting for direction.

Package

£70k-£120k salary depending on experience

Meaningful equity

Private health insurance

Meal allowance and team dinners

Hybrid working (London office 3 days per week)