Sr. Mechanical Building Engineer - Critical Environment

JLL empowers you to shape a brighter way. Our people at JLL are shaping the future of real estate for a better world by combining world class services, advisory and technology for our clients. We are committed to hiring the best, most talented people and empowering them to thrive, grow meaningful careers and to find a place where they belong. Whether you’ve got deep experience in commercial real estate, skilled trades or technology, or you’re looking to apply your relevant experience to a new industry, join our team as we help shape a brighter way forward. As a Senior Mechanical Building Engineer at JLL, you will serve as the technical cornerstone for advanced mechanical systems that sustain today's most critical data center and facility environments. This senior-level role combines deep mechanical engineering expertise with hands‑on operational leadership, positioning you as the go‑to expert for complex HVAC systems, chillers, cooling infrastructure, and environmental control systems. At JLL, we are collectively shaping a brighter way — for our clients, ourselves and our fellow employees, and your technical mastery will be essential in ensuring mission‑critical uptime and operational excellence. You'll lead sophisticated troubleshooting initiatives, mentor junior engineering staff, and drive innovative solutions that optimize both performance and energy efficiency. We embrace more innovative ways of working and prioritize opportunities to strengthen and advance your career, providing you with the platform to apply cutting‑edge mechanical engineering principles while managing large‑scale infrastructure projects. This role offers the perfect blend of technical challenge and leadership responsibility, allowing you to shape the future of critical facility operations while advancing your professional expertise. What your day-to-day will look like: Lead comprehensive operations and maintenance of critical mechanical infrastructure including HVAC systems, chillers, CRAC/CRAH units, cooling towers, and air handling systems Oversee complex chilled water systems, pumps, valves, piping networks, and filtration systems to maintain optimal environmental conditions for mission‑critical operations Execute advanced diagnostics and root cause analysis on sophisticated mechanical equipment failures, implementing sustainable solutions Apply mechanical engineering principles to design and implement cooling solutions optimized for high‑density server environments and evolving technology demands Serve as the primary escalation point for Level 1 and Level 2 mechanical issues requiring advanced technical expertise and critical problem‑solving Develop and execute comprehensive preventive maintenance schedules that ensure 100% uptime and peak performance across all mechanical infrastructure Analyze mechanical system performance data and implement optimization strategies that reduce Power Usage Effectiveness and enhance sustainability Mentor and guide junior mechanical technicians and engineers, fostering technical excellence and professional development within the team Coordinate complex mechanical infrastructure projects including system upgrades, expansions, and integration of cutting‑edge technologies Required qualifications: Minimum 5 years of hands‑on technical experience in critical facility mechanical engineering with expertise in HVAC, plumbing, and production equipment At least 3 years of specialized experience in data center or raised floor environments with complex cooling requirements Advanced technical knowledge of CRAC/CRAH systems (Liebert preferred), chillers, and comprehensive cooling infrastructure operations Current Universal EPA 608 Certification demonstrating expertise in refrigeration and environmental compliance Strong analytical and problem‑solving capabilities for diagnosing and resolving complex mechanical system challenges Demonstrated leadership and mentoring experience with ability to guide technical teams and drive operational excellence Excellent verbal and written communication skills for creating technical documentation, training programs, and stakeholder reporting Physical capability to lift up to 80 pounds, work at heights up to 30 feet, and operate in extreme temperature conditions and confined spaces Availability for emergency response calls, holiday coverage, and varied schedules as critical operations demand Preferred qualifications: Bachelor's degree in Mechanical Engineering or equivalent technical education with focus on HVAC and building systems Specialized expertise in Central Utility Plant Operations and advanced building automation systems integration Professional mechanical engineering license or industry-recognized advanced technical certifications Comprehensive experience with computerized maintenance management systems for large‑scale facility operations Knowledge of fire and life safety systems integration with mechanical equipment and emergency protocols Proven experience with energy management systems and successful implementation of sustainability initiatives that reduce environmental impact This position does not provide visa sponsorship. Candidates must be authorized to work in the United States without sponsorship. Location: On-site –Spartanburg, SC Personalized benefits that support personal well-being and growth: JLL recognizes the impact that the workplace can have on your wellness, so we offer a supportive culture and comprehensive benefits package that prioritizes mental, physical and emotional health. Some of these benefits may include: 401(k) plan with matching company contributions Comprehensive Medical, Dental & Vision Care Paid parental leave at 100% of salary Paid Time Off and Company Holidays Early access to earned wages through Daily Pay Jones Lang LaSalle (JLL), together with its subsidiaries and affiliates, is a leading global provider of real estate and investment management services. We take our responsibility to protect the personal information provided to us seriously. Generally the personal information we collect from you are for the purposes of processing in connection with JLL’s recruitment process. We endeavour to keep your personal information secure with appropriate level of security and keep for as long as we need it for legitimate business or legal reasons. We will then delete it safely and securely. For more information about how JLL processes your personal data, please view our Candidate Privacy Statement. For additional details please see our career site pages for each country. For candidates in the United States, please see a full copy of our Equal Employment Opportunity policy here. Jones Lang LaSalle (“JLL”) is an Equal Opportunity Employer and is committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation because of a disability for any part of the employment process – including the online application and/or overall selection process – you may email us at View email address on click.appcast.io. This email is only to request an accommodation. Please direct any other general recruiting inquiries to our Contact Us page > I want to work for JLL. At JLL, we give you the opportunity, knowledge and tools to own your success, because we value what makes each of us unique. For over 200 years, JLL (NYSE: JLL), a leading global commercial real estate and investment management company, has helped clients buy, build, occupy, manage and invest in a variety of commercial, industrial, hotel, residential and retail properties. A Fortune 500® company with operations in over 80 countries around the world, our employees bring the power of a global platform combined with local expertise. Driven by our purpose to shape the future of real estate for a better world, we help our clients, people and communities SEE A BRIGHTER WAYSM. JLL is the brand name, and a registered trademark, of Jones Lang LaSalle Incorporated. For further information, visit jll.com. #J-18808-Ljbffr Jones Lang LaSalle Incorporated