Control Systems Software Engineer (PLC / SCADA) Location: London (Hybrid)
Clearance: SC Cleared
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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 & 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

* Hands-on PLC integration experience (Rockwell and/or Siemens)

* Minimum 2 years in a software engineering environment

* Degree, HNC, HND, or equivalent in Software, Systems, or Electrical/Electronic Engineering

* Understanding of Functional Safety standards (BS EN 61508, 61511, 62061)

Desirable Background * Experience within Defence, Maritime, Aerospace, or similarly regulated sectors (Oil & Gas, Pharma, Petrochemical)