Software / PLC ProgrammerLocation: Powerstar, Sheffield S35 1QP (Office-based)Reporting to: Control Design Team LeadSalary: £40k - £50k dependant on experience and knowledge Powerstar is seeking a talented Software / PLC Programmer to join our growing Control Team in Sheffield. This is a fantastic opportunity for an ambitious engineer to play a key role in developing advanced control and monitoring software that supports industrial and energy systems across the UK.In this role, you’ll work across the full lifecycle of control system development - from concept and design through to testing, commissioning and ongoing support. If you enjoy problem-solving, creating robust solutions, and collaborating with a multidisciplinary engineering team, we’d love to hear from you.Main Duties and ResponsibilitiesDesigning, developing, enhancing, and testing PLC-based control applications using CODESYS and IEC 61131-3 languages (ST, FBD, SFC, LD).Implementing and debugging real-time systems for control panels and industrial automation networks.Translating functional specifications into reliable, maintainable, and scalable code.Integrating third-party hardware and communication protocols such as Modbus TCP/RTU, CANopen, OPC UA, Ethernet/IP.Supporting Factory Acceptance Testing (FAT), Site Acceptance Testing (SAT), and commissioning activities.Maintaining clear technical documentation, version control, and configuration backups.Diagnosing and resolving issues in both simulated and live environments — locally and remotely.Working closely with engineering and controls colleagues to deliver best-in-class monitoring and automation solutions.ExperienceEssential:2+ years’ experience with CODESYS or similar PLC platforms (Siemens TIA Portal, Beckhoff TwinCAT, ABB).Strong understanding of Structured Text (ST) and other IEC 61131-3 languages.Background in industrial automation or energy control systems.Ability to interpret electrical schematics and P&IDs.Experienced in testing, debugging, and troubleshooting real-time control systems.Knowledge of control system design principles (signal conditioning, interlocks, safety systems).Desirable:Experience with BESS, HVAC controls, or renewable/energy systems.Knowledge of industrial networking, firewalls, routers, and communication protocols.Exposure to HMI/visualisation tools (CODESYS Visualisation, Ignition, Wonderware).Experience with Linux-based embedded systems or RTOS.QualificationsAppropriate Engineering qualification for example Bachelor’s or Master’s degree in Electrical Engineering, Control Systems Engineering, or related discipline.