Full Stack Developer

This role is central to the day-to-day success of Arbtech and contributes directly to operational performance and customer outcomes. As a Junior Full-Stack AI/ML Engineer, you will be responsible for building innovative AI and mobile solutions, supporting data pipelines, and automating operational processes to improve efficiency across the business. This is a hands-on role suited to someone who thrives in a fast-paced technical environment and enjoys taking ownership, solving problems, and making a tangible impact.

• Build end-to-end AI/ML applications that solve real-world problems
• Develop cross-platform mobile applications using Flutter for iOS and Android
• Design and maintain scalable backend systems handling data pipelines and model inference
• Create intuitive front-end and mobile interfaces that make AI accessible
• Contribute to operational automation to improve processes and efficiency at HQ
• Work collaboratively with internal teams and stakeholders
• Contribute to continuous improvement, compliance, and quality standards, Celnor Group does not require agency support for this role. Where agency engagement is necessary, we work exclusively with our preferred supplier partners. We may use AI-enabled tools to support elements of the recruitment process; however, these tools are not used for candidate screening, scoring, or decision-making. All hiring decisions follow a human-first approach. Our recruitment systems are ISO 42001 accredited, ensuring the responsible and ethical use of AI technologies.

Do you have experience in iOS?, * You are an enthusiastic and motivated engineer with a practical, solutions-focused mindset. You will ideally have:

• 2-4 years of experience building and shipping full-stack applications
• Strong Python skills with experience in AI/ML libraries (PyTorch, TensorFlow, etc.)
• Experience with Flutter and Dart, including widgets, state management, and navigation
• Exposure to modern frontend frameworks (React/Next.js or similar)
• Basic knowledge of cloud deployment (Docker, CI/CD, AWS/GCP)
• Interest in LLMs, model deployment, or data pipelines

You are also:

• Comfortable working independently while taking initiative
• Curious and eager to grow across the full stack
• Able to debug and troubleshoot across the front-end, backend, and infrastructure
• Proactive in seeking feedback and finding ways to add value

Bonus points

• Flutter apps you've built and published
• Mobile app integration with backend APIs and cloud services
• App Store or Google Play deployment experience
• AI/ML tools or applications you've shipped or contributed to
• UI/UX design skills or open-source contributions
• Experience with Firebase, database design, API development, or responsive design

• Pension scheme
• Equipment and tools to support you in your role
• Employee Assistance Programme
• Generous holiday entitlement (28 days first year, increasing to 40 + bank holidays after one year)

Arbtech is a specialist provider within the environmental services sector, supporting clients across the UK. We are known for our technical expertise, commitment to quality, and strong client partnerships. As the business continues to grow and evolve, we are looking for a Junior Full-Stack AI/ML Engineer to play a key role in supporting our next phase of development. Celnor Group is a UK-based environmental services group operating across the Testing, Inspection, Certification and Compliance (TICC) landscape. With a growing portfolio of specialist businesses, Celnor provides essential services that protect people, property, and the environment. While each business retains its own identity, culture, and technical specialism, all are supported by a central group function that invests in people, systems, and long-term sustainable growth.