Control Systems Software Engineer (PLC / SCADA) Location: London (Hybrid)Clearance: SC Cleared To apply, email: or call Overview An opportunity for an experienced Control Systems Software Engineer to work on mission-critical naval platform management systems within a highly regulated defence environment. The role covers full lifecycle development and in-service support of safety-critical PLC and SCADA/HCI solutions supporting the UK submarine fleet. Key Responsibilities Produce functional and design specifications for control system software Design, develop, and maintain high-quality, maintainable code Capture, interpret, and refine customer and system requirements Develop and implement PLC and SCADA/HCI applications Integrate data communications with third-party equipment Produce technical documentation to internal and customer standards Support and conduct Factory Acceptance Tests (FATs) Contribute to in-service and through-life system support Ensure compliance with company policies, safety, and statutory requirements Essential Skills and Experience Experience developing client-server applications Strong computer science fundamentals (OOP, data structures, algorithms) Programming experience in C++, C#, or Java Control systems and graphical user interface development experience Familiarity with unit testing frameworks Experience with software configuration management and version control Industrial Ethernet communication protocols and networking standards