Design and coordinate all mechanical and electrical systems, including air conditioning, ventilation, fire protection, plumbing, communications, lighting, smart systems, and energy systems. Work from the on-site office, supporting both the design process and real-time project execution. Collaborate closely with the owner, project managers, architects, engineers, coordinator and consultants to ensure all systems are aligned with project requirements. Attend to technical issues or design discrepancies by providing practical, safe, and cost-effective solutions Maintain open communication with the owner and provide progress reports or issue updates when required Ensure all work complies with Thai regulations and applicable international standards Lead the engineering design of all M&E systems across the project. Create and prepare technical drawings for tender purposes in AutoCAD, SketchUp and PDF format. Proficiency in Revit is preferred but not a strict requirement Ensure detailed design and documentation of: HVAC systems (calculation, air conditioning, ventilation), Electrical power networks from transformer to MDB, EMDB, DB, LP, and subpanels, Load schedule tables for all electrical panels, Lighting design and power receptacle layout for the entire project, Fire alarm, CCTV, LAN, and smart home systems (e.g., KNX protocol), Integrated indoor/outdoor audio systems and automatic locking systems for doors, gates, and ports, Plumbing systems, including clean water, hot water, RO, sanitary, and drainage systems, Wastewater treatment systems, pumps, and control systems, • Specialty systems: sprinkler irrigation, solar cell system, Tesla Powerwall, EV charger, spa, sauna, fitness, kitchen, wine cellar, bowling alley, emergency lighting, and cold rooms. Design for all wiring, cabling, connectors, and components Provide calculations for water consumption, wastewater, and HVAC load. Support authority submissions by preparing approved drawings and assisting in securing required permits. The ability to produce own drafts and technical drawings is preferred, but close collaboration with the Draftsman is essential to ensure design accuracy and consistency Supervise and inspect MEP works on-site to ensure alignment with design drawings and quality standards Conduct daily inspections to track progress, check compliance, and ensure proper installation methods Review and approve shop drawings, technical documentation, and material submissions. Oversee system commissioning, ensuring that all installed systems are fully operational and match design intent. Support the site team by adjusting drawings or designs in response to real-time conditions or changes. Participate in inspection and testing of installed systems to ensure compliance with safety regulations and industry standards. Report and escalate any significant issues directly to the owner and contribute to project decision-making as needed.