Graduate / Junior Software Engineer - Mission-Led Start-Up - £35k-£50k + Benefits in London

Energy Jobline is the largest and fastest growing global Energy Job Board and Energy Hub. We have an audience reach of over 7 million energy professionals, 400,000+ monthly advertised global energy and engineering jobs, and work with the leading energy companies worldwide.

We focus on the Oil & Gas, Renewables, Engineering, Power, and Nuclear markets as well as emerging technologies in EV, Battery, and Fusion. We are committed to ensuring that we offer the most exciting career opportunities from around the world for our jobseekers.

Job Description

Opportunity Summary

Role | Graduate / Junior Software Engineer (Full-Stack)

Experience | STEM degree (or equivalent) + personal projects / demonstrable passion for tech

Company | Mission-Led Start-Up

Stage | Scaling engineering team

Location | London (Hybrid)

Offer | £35,000 – £50,000 + benefits

The Opportunity

Kioni Talent is supporting a mission-led start-up in London as they expand their engineering team.

This is an exciting role for a passionate technologist who wants to work across the stack, learn from experienced engineers, and contribute to building meaningful software from day one.

You’ll be working with modern web technologies — React, TypeScript, Next.js, Tailwind CSS — with the backend hosted on AWS. This is a hands-on role where you’ll get real responsibility quickly, and the chance to develop your skills in a supportive, high-growth environment.

What You’ll Do

• Build new features and maintain existing ones across frontend and backend systems
• Write clean, maintainable code while learning best practices from experienced engineers
• Collaborate closely with the team to deliver high-quality products
• Contribute ideas to improve both product and technical decisions
• Continue learning and developing your technical skills as the company scales

What You’ll Bring

• A STEM degree (or equivalent qualification)
• Evidence of your passion for technology — whether through personal projects, internships, open-source contributions, or hackathons
• Familiarity with at least one programming (JavaScript, TypeScript, Python, etc.)
• Willingness to learn React, TypeScript, Next.js, Tailwind CSS, and AWS
• A collaborative mindset and eagerness to be part of a growing team

Why Join?

• Work with a modern tech stack and learn from experienced engineers
• Be part of a mission-led business making a real impact
• Gain exposure to all parts of the product development process
• Grow your career in a high-energy, supportive environment
• Competitive salary and benefits

If you’re excited by the idea of building meaningful products, learning quickly, and growing as part of a talented team — we’d love to hear from you.

Apply now to find out more about the company and the opportunity.

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.