· 10+ years of hands-on experience in Siemens TIA Portalnamed directly (not just "PLC programming" generically).· Proven experience with Siemens failsafe/F-series PLCs (e.g., S7-1500F, S7-400F/H, or equivalent) and safety logic development (PROFIsafe, F-FB/F-FC configuration, safety function validation).· Hands-on experience with Siemens WinCC (Advanced/Comfort or Explorer) for SCADA/HMI development.· Design and validate gas-safety interlocks and shutdown sequences for H2/O2 handling — including gas detection, purge/inerting logic, pressure/flow monitoring, and emergency shutdown (ESD) sequences.· Understand and Develop software for: functional design specifications (FDS), I/O lists, control philosophy, P&ID; cross-references, safety logic narratives, and test protocols (FAT/SAT).· Support software-in-the-loop (SIL) simulation and virtual commissioning activities where applicable with exposure to software’s like PLCSIM Advanced.· Team-lead or supervisory experience, ideally with contract/third-party manpower.· Exposure to communication protocols: Profibus, Profinet, CAN, Modbus TCP/RTU, OPC UA.