Commissioning Expert OSS Onshore/Offshore

We´re Hiring: Commissioning Expert - Mechanical & Auxiliary Systems (Offshore / Onshore Substations) Are you a seasoned commissioning professional with a strong background in mechanical and auxiliary systems? We are looking for a Commissioning Expert to support the delivery, integration, and testing of auxiliary mechanical systems on offshore and onshore substations — as part of large-scale renewable energy infrastructure across Europe. This is a long-term assignment (until end of 2027) on major offshore wind projects. Locations: The Netherlands (Vlissingen, Schiedam, Stormpolder), Offshore Baltic Sea, Berlin Type: Freelance or employment Level: Professional / Expert Your Mission: • Plan, execute, and supervise commissioning of mechanical & auxiliary systems, including: HVAC, LV switchboards, firefighting (FiFi) systems, cranes, communication, and safety systems • Ensure full compliance with technical specifications, certification, and HSE standards • Conduct FAT/SAT (Factory and Site Acceptance Testing), signal testing, and inspections • Identify and report deviations and maintain up-to-date snag lists, punch lists, and documentation • Support partial and final system acceptance in factory, yard, and offshore locations • Collaborate with construction, QA/QC, and engineering teams for smooth integration Your Profile: • 5+ years of experience in commissioning and integration of auxiliary/mechanical systems on substations or industrial platforms • In-depth knowledge of DIN VDE, IEC standards, and relevant certification requirements • Experience with QA/QC processes during fabrication and commissioning phases • Valid GWO (Global Wind Organisation) certification for offshore work • Fluent English required; German is a plus Ready to take on the challenge — or know someone who fits? Let’s connect!