Junior Full Stack PHP Software Engineer - Sustainability

We re looking for a UK-based Junior Full Stack Engineer to support development on our sustainability and digital learning platforms., You ll work closely with senior engineers to build and improve features that impact thousands of learners, while developing your skills in modern web development and AI-assisted engineering., * Support the build and maintenance of custom Moodle plugins, themes and features (with guidance)

• Write clean, reusable PHP and contribute to modern, responsive UI work (HTML/CSS/JS)
• Assist with RESTful APIs and system integrations (implementing defined tasks)
• Fix bugs, improve existing code, and contribute to small-to-medium enhancements
• Write and maintain unit tests (and contribute to Behat tests where relevant)
• Participate in code reviews as a learner (receiving feedback and making improvements)

System Support & Quality

• Help troubleshoot issues and improve performance under supervision
• Follow best practices for accessibility, GDPR and data protection (with support)
• Contribute to QA processes and data integrity checks

Collaboration

• Work within a cross-functional agile team (engineers, product designer, product manager)
• Communicate progress clearly and ask for help early when blocked
• Engage with stakeholders (e.g., Learning Technologists) mainly via your team lead

• English proficiency and UK work authorisation
• 1 2 years commercial experience (or equivalent demonstrable experience/portfolio) in PHP/web development

Working Knowledge of:

• PHP fundamentals
• HTML, CSS3, JavaScript
• Relational databases (PostgreSQL/MySQL)
• Git

Desirable:

• Exposure to Moodle or other LMS platforms
• Docker basics
• Any experience using AI coding tools effectively
• Familiarity with WordPress

You ll be a curious and ambitious engineer who takes pride in writing clean, thoughtful code, enjoys solving real-world problems, and is excited to grow your skills while building technology that makes a meaningful impact.

The Role at a Glance:

Junior Full Stack Engineer Old Street, London / Hybrid Working / 1 day a week in the office £35,000 Plus fantastic benefits: 8% employer pension contribution, mental health support, fitness allowance, enhanced maternity/paternity pay, volunteer days, and more Permanent - Full Time

Product / Service: Sustainability Consultancy; Training & Events Culture: Close knit, small and agile company, flat hierarchy, direct communication with director and hiring managers alike, * A competitive market salary of £35,000

• 25 days + 8 statutory holidays, plus an extra day for your birthday
• Hybrid working
• 8% employer pension contribution
• If we exceed targets, the full team gets rewarded through our profit share scheme
• Discretionary bonus
• Fitness allowance
• Enhanced maternity/paternity pay and childcare schemes
• Volunteer days
• Access to our vibrant Old Street office featuring a lounge, café bar, gym, and rooftop terrace
• Leverage professional memberships and development programmes tailored to your career aspirations.

Action Sustainability is a leading consultancy with the aim of inspiring sustainable business. Our team comprises 60+ full and part-time employees and associates. Many of our clients are sector leaders on sustainability and supply chain issues, and we are proud of our reputation for leading the thinking in this area. Action Sustainability drives lasting change in sustainability through innovative technology, expert advisory, and award-winning learning solutions. They partner with leading organisations, including the NHS and Houses of Parliament, to create measurable impact across industries. As the delivery team behind the Supply Chain Sustainability School, we lead global collaboration to accelerate sustainability. An accredited Living Wage employer, we ve been recognised by Best Companies with a 'One to Watch' status for their commitment to an outstanding workplace. We prioritise regular wellbeing check-ins, ensure employees are heard, and offer mental health support. Our competency framework enables employees to shape their career paths with clear development goals, while managers receive coaching, mentoring, and peer-sharing opportunities to enhance their leadership skills. This comprehensive approach supports an environment where personal and professional growth thrive.