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Job Description

Senior Software Engineer – Node.js / Backend Development – London (Hybrid, 3 days onsite)

Are you the kind of Senior Software Engineer who enjoys taking something fast-and-scrappy and turning it into something scalable, elegant, and genuinely robust?

This is a chance for a Senior Software Engineer to join a small, but ambitious tech-for-good / IoT start-up based in the London City Centre that’s building products to make sense of massive data streams. You’ll be part of a tight-knit team (around ten people total, five software engineers), working on a genuinely greenfield platform with a modern stack and zero legacy

The focus now is on maturing the codebase - re-architecting, refactoring, testing, and scaling. As a Senior Software Engineer, you’ll play a key role in helping the team evolve from early-stage speed to long-term stability, with the freedom to influence both product direction and engineering quality

What you’ll be doing:

Building and scaling a Node.js application that sits at the core of the product

Designing and implementing new features for different sectors and use cases

Helping drive improvements in code quality, architecture, and testing practices

Working closely with product and engineering to prioritise, shape, and deliver features

Introducing best practices and guiding a shift towards cleaner, more maintainable code

What we’re looking for:

Strong hands-on experience with Node.js – backend software development

Comfortable working across or picking up other tech as needed – ie AWS, React etc (If you have experience with AWS & React, that is a bonus)

Enthusiasm for writing clean, tested, production-ready code

Experience (or interest) in data-heavy systems, IoT, or connected devices

Ultimately, this is a backend focussed position, so as a Senior Software Engineer you’ll have to be comfortable with the backend nature of the role

If you’re a Senior Software Engineer who likes solving real problems, shaping a product, and being part of something early – this is worth a chat

If you are interested in applying for this job please press the Apply Button and follow the application process. Energy Jobline wishes you the very best of luck in your next career move.