Full Stack Developer - Sustainability Technology​/Digital Learning

Position: Full Stack Developer - Sustainability Technology / Digital Learning
Location: Greater London

Build Technology That Makes Sustainability Happen.
Code with purpose. Build products that educate thousands. Grow with a team that's shaping the future of sustainable business.
We're looking for a UK-based Full Stack Developer to help evolve our sustainability and digital learning platforms, building robust, scalable solutions that directly support thousands of learners across the construction and infrastructure sectors.
If you enjoy solving technical challenges, collaborating with talented product teams and working in an environment that embraces AI-assisted development, we'd love to hear from you.

The Role at a Glance
Full Stack Developer
Remote Working - UK Based
£70,000 - £80,000
Plus Fantastic Benefits Including 8% Employer Pension Contribution, Mental Health Support, Fitness Allowance, Enhanced Family Leave, Volunteer Days & More
Permanent | Full Time
Product / Service:
Sustainability Consultancy, Learning Technology & Digital Platforms
Culture:
Small, collaborative product team with direct access to decision makers, modern engineering practices and genuine opportunities to influence product direction.
Heads-Up:
We really appreciate a short introductory cover note explaining why this opportunity caught your eye.
Who We Are
Action Sustainability is a leading sustainability consultancy helping organisations create lasting environmental and social impact.
Working with organisations including the NHS and Houses of Parliament, we combine expert consultancy, innovative technology and award-winning learning solutions to accelerate sustainable change across industries.
Our bespoke digital learning platforms support thousands of professionals every day, and our engineering team plays a central role in continuously improving those experiences.
We're an accredited Living Wage employer recognised by Best Companies as a "One to Watch", with a genuine commitment to wellbeing, professional development and creating an environment where people can do their best work.
About the Role
This is a hands-on development role where you'll help build, improve and maintain the technology powering our digital learning platforms.
Working as part of a close-knit product team, you'll contribute across the full development lifecycle, from building responsive user interfaces through to developing robust backend functionality and helping shape the future direction of our products.

You'll work with modern technologies, collaborate closely with designers, product managers and stakeholders, and make extensive use of AI-assisted development tools to improve quality and productivity.
What You'll Be Working On
We believe developers should influence products, not simply complete tickets.
You'll play an active role in delivering major roadmap projects across our customised Moodle learning platform, developing new functionality, improving user experience and helping thousands of learners access world-class sustainability education.
You'll contribute ideas, solve meaningful technical challenges and work alongside a collaborative team that values innovation and continuous improvement.

Key Responsibilities

• Develop modern, responsive front-end experiences from detailed design specifications.

• Write clean, reusable and maintainable PHP and JavaScript code.

• Build and enhance functionality across our customised Moodle platform.

• Perform code reviews and contribute to engineering best practice.

• Support fellow developers through collaboration and knowledge sharing.

• Maintain high software quality through testing and continuous improvement.

• Write and maintain unit tests and Behat tests where appropriate.

• Work closely with designers, product managers and engineers throughout delivery.

• Participate in Agile ceremonies and collaborative planning sessions.
System Management & Support

• Troubleshoot application issues and optimise performance.

• Support scalability, reliability and maintainability across the platform.

• Ensure compliance with accessibility standards, GDPR and secure development practices.

• Contribute to quality assurance activities and maintain data integrity.
Continuous Improvement

• Help improve user experience through product enhancements.

•…