Senior Mechanical Engineer

Job description

Job Description Overview The Senior HVAC Engineer will be responsible for the engineering, design, coordination, and delivery of HVAC systems for complex industrial, advanced technology, and energy projects in South Korea. Working closely with Project Managers, Process, Mechanical, Piping, Architectural, Civil/Structural, and E&I teams, clients, vendors, and global AtkinsRéalis experts, the role ensures HVAC designs are safe, compliant, energy‑efficient, constructible, and fully integrated with overall project execution objectives. With a strong focus on Advanced Technology (semiconductors, data centers, secondary batteries, advanced materials), Renewable Energy and Energy Transition (solar, onshore/offshore wind, energy storage systems, green hydrogen, battery value chain projects), and process‑driven industrial sectors including pharmaceutical, biopharmaceutical, food, agrifood, chemical, fine chemical, and broader industrial processing facilities, the Senior HVAC Engineer will support projects across all phases—from concept development, basic design, and detailed design through construction, commissioning, qualification support, and close‑out. Your role Lead and deliver HVAC engineering designs and deliverables in accordance with project scope, applicable codes, standards, client specifications, and regulatory requirements. Develop HVAC system concepts, basis of design, load calculations, airflow diagrams, equipment sizing, duct and piping layouts, control philosophy, and technical specifications. Design and specify HVAC systems and equipment, including AHUs, exhaust systems, cleanroom HVAC, ventilation systems, chilled water and heating water systems, humidification/dehumidification systems, and packaged equipment. Perform and review HVAC calculations, including cooling/heating loads, ventilation rates, pressure cascade, air change rates, duct sizing, static pressure, and energy performance assessments. Coordinate closely with Process, Mechanical, Piping, Architectural, Civil/Structural, and E&I disciplines to ensure HVAC systems are properly integrated into process requirements, building layouts, utilities, controls, and constructability constraints. Prepare and review HVAC datasheets, specifications, layouts, schedules, material requisitions, technical bid evaluations, and vendor documents. Support vendor engagement and procurement activities, including technical clarifications, vendor drawing reviews, factory acceptance tests, and coordination of long‑lead HVAC equipment. Participate in design reviews, HAZOPs, constructability reviews, commissioning planning, and qualification readiness reviews, incorporating outcomes into finalized HVAC designs. Provide HVAC engineering support during construction, installation, testing, commissioning, and start‑up, including resolution of technical queries, site issues, and design changes. Ensure compliance with international and local codes and standards, including ASHRAE, SMACNA, NFPA, ISO, GMP, cleanroom requirements, client standards, and Korean regulatory requirements where applicable. Guide junior engineers and designers, provide technical direction, review deliverables, and support development of HVAC engineering capability within the project team. Collaborate with global AtkinsRéalis HVAC and building services subject matter experts to apply best practices, standardized methodologies, and lessons learned. About you Bachelor’s degree in mechanical engineering, HVAC engineering, building services engineering, or related field, with +15 years of relevant HVAC engineering and project experience. Proven experience as a Senior HVAC Engineer or Lead HVAC Engineer on industrial, advanced technology, energy, pharmaceutical, biopharmaceutical, or other regulated facility projects. Strong capability in HVAC load calculations, ventilation design, cleanroom HVAC design, pressure cascade control, duct and piping coordination, and equipment selection. Experience working in multidisciplinary EPCM / EPC project environments, including coordination with process, mechanical, piping, architectural, structural, electrical, I&C, and construction teams. Familiarity with international and local HVAC codes, standards, and industry practices, including ASHRAE, SMACNA, NFPA, ISO cleanroom standards, GMP requirements, and Korean regulations where applicable. Ability to review and guide HVAC deliverables produced by engineers and designers, including calculations, layouts, specifications, datasheets, schedules, and vendor documents. Strong analytical, communication, coordination, and technical leadership skills. Ability to work effectively within a global, multicultural project delivery environment. Hands‑on experience with HVAC design and coordination tools such as Revit, AutoCAD, Navisworks, BIM platforms, load calculation software, and other industry‑standard tools. Fluent written and oral English is an asset. Rewards & benefits Explore the rewards and benefits that help you thrive – at every stage of your life and your career. This includes: Comprehensive life insurance coverage. Premium medical insurance. Generous annual leave balance. Flexible and hybrid work solutions. Remote work opportunities outside of country. Discretionary bonus program. Relocation assistance. Transportation & housing allowances (available for remote work locations). Employee Wellbeing Program: 24/7 access to specialists in finance, legal matters, family care, personal health, fitness, and nutrition. Seize every opportunity to sharpen your skills, expand your expertise, and be recognized for the impact you make. About AtkinsRéalis We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people. Find out more. Worker Type Employee Job Type Regular At AtkinsRéalis , we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.