* 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.