PHP Full Stack Software Engineer - Supply Chain / Sustainability

We’re seeking a UK-based PHP Full Stack Software Engineer to support the continued growth of our sustainability and digital learning platforms. You’ll be a hands-on developer who enjoys building modern, responsive user experiences, writing clean, scalable code, and collaborating closely with designers and cross-functional teams. This is an opportunity to contribute to platforms that deliver meaningful impact at scale, improving the learning experience for thousands of users. The Role at a Glance: PHP Full Stack Software Engineer Old Street, London / Hybrid Working / 1 day a week in the office £70,000 - £80,000 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 Heads-Up – We really value a short intro covering note :-) Closing Date: 22nd May Who we are: 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 through innovative technology, expert advisory, and award-winning learning solutions. We partner with leading organisations, including the NHS and Houses of Parliament, to create measurable impact across industries. An accredited Living Wage employer, we’ve been recognised by Best Companies with a 'One to Watch' status for our commitment to an outstanding workplace. We prioritise wellbeing, offer clear development pathways, and create an environment where people can grow both personally and professionally. About the Role: This is a hands-on development role focused on delivering high-quality front-end experiences alongside robust PHP-based functionality. You’ll work closely with designers and stakeholders to bring user experiences to life, while contributing to the ongoing development and optimisation of our Moodle-based platforms. We make extensive use of AI-assisted development tools and are continuing to expand this across the team, so you’ll play a part in shaping how these are used effectively. Key Responsibilities: You will collaborate with designers to translate detailed front-end specifications into high-quality web pages, building modern, responsive interfaces that enhance user experience. You will write clean, reusable code across both front-end and PHP components, while contributing to code reviews and supporting other developers where needed. You will take ownership of software quality, ensuring best practices are followed across development, testing, and performance optimisation, including writing and maintaining unit and Behat tests. System Management & Support: You will troubleshoot issues and optimise applications to ensure performance, scalability, and reliability across platforms. You will ensure systems meet accessibility standards, GDPR requirements, and data protection best practices, while supporting QA processes and maintaining data integrity. Collaboration & Stakeholder Management: You will work as part of a cross-functional team alongside engineers, product designers, and product managers, contributing to all stages of the agile development lifecycle. You will engage with wider stakeholders including Learning Technologists, Sustainability Consultants, and Designers, providing technical guidance and translating requirements into effective solutions. Continuous Improvement: You will stay up to date with modern front-end technologies, particularly HTML, CSS, and JavaScript, and proactively suggest improvements to user experience and development practices. You will contribute to the evolution of AI-assisted development within the team, helping to identify opportunities for efficiency and quality improvements. Essential Requirements: You must have UK work authorisation and strong English communication skills, alongside 3–5 years of commercial front-end development experience. You’ll bring strong technical capability across HTML, CSS3, and JavaScript, with experience working with relational databases such as MySQL or PostgreSQL, and confidence using Git for version control. Experience with Bootstrap, Ajax, and jQuery is important, alongside a solid understanding of writing optimised, maintainable code. Professional Skills: You are a strong problem-solver who can optimise code and troubleshoot effectively. You communicate clearly, work well with others, and are comfortable managing multiple priorities in a collaborative environment. Desirable Skills: Experience with Moodle would be highly beneficial, along with familiarity with Docker, cloud platforms, CI/CD pipelines, and Linux environments. Knowledge of authentication protocols, WordPress, or additional programming languages would be advantageous, as would any exposure to AI-assisted coding tools or project management practices. What’s on Offer: • A competitive salary of £70,000 - £80,000 • 25 days + 8 statutory holidays, plus an extra day for your birthday • Hybrid working • 8% employer pension contribution • Profit share scheme and discretionary bonus • Fitness allowance • Enhanced maternity/paternity pay and childcare schemes • Volunteer days • Access to our vibrant Old Street office with lounge, café bar, gym, and rooftop terrace • Ongoing professional development tailored to your career goals Apply today and be part of a team using technology to drive real-world sustainability impact. Application notice... We take your privacy seriously. As you might expect you may be contacted by email, text or telephone. 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