Salary: £130,000 - 150,000 per year Requirements: Active DV clearance (essential)/n- Strong experience programming Siemens PLCs from scratch/n- Background in on-site commissioning and testing of PLC systems/n- Experience working in secure or regulated environments/n- Ability to technically lead software activities and support junior engineers/n- Confident communicator, comfortable working directly with clients/n- Degree-level qualification in a relevant engineering discipline (or equivalent experience) Responsibilities: Designing, developing and programming Siemens PLC systems from scratch/n- Leading all software activities on an assigned project/n- Configuring Siemens PLCs, HMIs and associated networks/n- Producing on-site test documentation and supporting FATs and SATs/n- Carrying out on-site testing and commissioning of PLC systems/n- Acting as the technical interface with the client during delivery/n- Providing technical leadership, mentoring and support to other engineers/n- Ensuring software delivery meets programme, budget and quality requirements Technologies: Support PLC Security Hardware More: We are seeking a DV cleared Senior Software Engineer for a 12-month onsite contract in Aldermaston. In this role, you will take full ownership of software delivery, focusing on high-security, technically challenging projects. We offer a competitive daily rate of £650 to £750 and a work schedule of 4-5 days onsite per week. You will be part of a dedicated team within a highly secure defense environment, engaging in mission-critical control system projects. last updated 5 week of 2026