Full Stack Developer - .NET / React / Azure Eastleigh (3 days onsite / 2 days WFH) £55,000 - £65,000 15% bonus benefits My client, a rapidly growing leader in the water treatment and utilities technology sector, is seeking an experienced Full Stack Developer to join their expanding engineering team. This is an exciting opportunity to work on a greenfield enterprise platform, building the next generation of IoT/telemetry monitoring solutions used across water treatment, pump systems, and utility environments. The business has grown significantly over the last 18 months and plans to scale by a further 30% next year. As a Full Stack Developer, you'll be a key contributor in designing and delivering the company's new customer portal, backend APIs, and integrations with real-time IoT infrastructure. The Role You will design, build, and maintain secure, scalable software across both backend (.NET) and frontend (React) ecosystems, working closely with product, engineering, and operations teams. You'll help shape best practices, support junior developers, and ensure the delivery of robust cloud-native solutions. Technical Environment Backend (primary focus) .NET 8 Mix of .NET Core and .NET Framework (approx. 50/50) Building APIs powering the IoT device fleet and customer portal RESTful API design (GraphQL beneficial, not essential) Frontend ReactJS Open to strong frontend engineers willing to transition to React React Native experience is a plus Cloud Azure preferred (App Services, Storage, IoT Hub, Event Hub, Data Explorer) Open to AWS or GCP candidates with strong cloud integration experience Must understand cloud deployments, monitoring, and API integration DevOps CI/CD pipeline setup and maintenance Monitoring, observability, automated deployments Strong engineering hygiene (not a DevOps role, but good DevOps practices required) Security Secure coding principles Authentication/authorisation (OAuth2, Entra ID/B2C) Role-based access control (RBAC) Key Responsibilities Design, develop, and deploy full stack web applications using .NET and React. Build and maintain backend APIs to support internal systems, IoT telemetry, and customer-facing applications. Develop new features for the customer portal including dashboards, mapping, device status, alerts, and access control. Integrate cloud resources and ensure scalable, secure deployments. Contribute to CI/CD pipeline development and best practices. Support the engineering team through code reviews, mentoring, and technical guidance. Collaborate with technical and non-technical stakeholders across the business. Industry Experience (nice to have) Candidates from the following sectors will have an advantage: Water Industry Utilities Engineering Plant Hire Construction Civil Engineering Why Join? Opportunity to build a greenfield platform from the ground up High-growth company with strong investment Work directly on impactful IoT and telemetry solutions Clear progression opportunities as the team scales Supportive, collaborative engineering culture