Senior Control Systems Engineer – Data Center Controls (6-Month Contract, Ireland) - FREELANCE - 6 month rolling contractsEdison Smart are recruiting on behalf of a major client in the Data Center EU space.Responsibilities:Design, program, and maintain critical data center automation systems (PLC/DCS/BMS) using Siemens platforms such as Simatic PCS7, S7/TIA Portal, WinCC, and Desigo.Perform on-site commissioning, FAT/SAT testing, and troubleshooting of control systems for HVAC, power, UPS, and cooling.Implement software updates, firmware upgrades, and manage HMI/SCADA visualization, operator interfaces, and system backups.Collaborate with engineering teams, vendors, and clients to interpret specifications, develop control logic, and integrate automation projects on schedule.Ensure networked control systems meet security and reliability standards, including configuration of Ethernet/IT networks, OT security compliance, and documentation of system changes.Required Skills & Experience:Minimum 5 years' experience in industrial control systems, preferably in data centers or mission-critical facilities, with proven Siemens expertise (Simatic PCS7, Step 7/TIA, WinCC).Strong PLC programming (ladder logic, FBD, STL, CFC) and HMI/SCADA configuration experience.Knowledge of industry protocols (BACnet, Modbus/Profibus, OPC) and integration with BMS/EPMS systems.Demonstrated experience in system commissioning, FAT/SAT, debugging, and optimization.Proficiency in Windows OS, networking fundamentals, SQL, and basic IT/OT cybersecurity.Capable of independent work as a contractor with strong problem-solving and project coordination skills.Contract:6-month rolling freelance engagement within Ireland's data center sector.Competitive day rate based on experience.