Senior Mechanical Engineer / Transient Thermal Simulation Technologist

Market Energy

At Jacobs, we're challenging today to reinvent tomorrow by solving the world's most critical problems for thriving cities, resilient environments, mission-critical outcomes, operational advancement, scientific discovery and cutting-edge manufacturing, turning abstract ideas into realities that transform the world for good.

Your impact

The energy industry is undergoing rapid and dramatic changes, transforming the utility landscape to enhance reliability and sustainability. In response, Jacobs is expanding its Energy & Power Solutions team to tackle the complexities of decarbonization and deliver a cleaner and more secure energy future. If you are seeking a meaningful career in the Energy sector, this may be the perfect fit for you!

In this position you will receive the opportunity to be mentored by Professional Engineers while you engage with our clients, evaluate their energy needs, develop concept-level plans and solutions, and take these through detailed design to provide for full execution of the solution. We offer and deliver a true “end-to-end” life-cycle service from exploration, development, operation, and repowering/retirement. Demonstrated abilities include a basic understanding of mechanical and process engineering disciplines. Prior experience in consulting and design engineering will be highly regarded.

Your primary responsibilities will focus upon providing consulting, advisory, conceptualization, and design of data center cooling systems, district heating and cooling, thermal energy storage, and geothermal resources, working closely with our mechanical, energy, and geothermal engineering teams in North America. Specific tasks may include digital twin development of thermal energy assets and cooling systems in AI data center, piping and equipment sizing and selection, flow modeling, energy analysis, and life cycle cost evaluations, among other design engineering activities. You’ll be expected to possess a strong grasp of engineering fundamentals, an understanding of mechanical engineering, excellent communication skills, and exceptional problem-solving skills with the confidence to explore innovative solutions.

This position performs thermodynamic, technology, market, and economic analysis, with an emphasis on data center cooling and power generation systems infrastructure. Work may also include industrial process applications, water conservation goals, scope 1 and scope 2 emissions analysis, among others. The successful candidate will perform engineering/economic design of thermal energy networks and low- or no-emissions energy systems in cooperation with mechanical, thermal, chemical, control systems, electrical, geothermal scientific, and HVAC engineers.

You will collaborate with our technical leadership, operations, client account managers and sales professionals on pursuits of strategic importance to the firm, and in the internal promotion of advanced transient simulation methods and tools as possible solutions for our existing multi-sector client base. You’ll be expected to demonstrate collaboration and high levels of communication and problem-solving skills.

The overall energy & power market, and the data center delivery market in particular, is experiencing an increase in activity with strong development growth. Jacobs has a long history of providing advisory and design services to clients and is looking to further strengthen our team in this space.

If you are passionate about developing reliable and sustainable energy projects, motivated by a challenge, and enjoy working with a dynamic, multi-disciplinary team to develop innovative solutions, Jacobs is the place for you. Come join our growing team to realize the future of energy!

Here's what you'll need

• Bachelor's or Advanced Degree in Mechanical Engineering or related engineering discipline
• Professional Engineer (PE) license, or Engineer-in-Training (EIT) with ability to obtain PE license
• At least 15 years of related design/consulting experience, or Master’s degree plus at least 14 years of experience, or PhD plus at least 10 years of experience
• Demonstrated ability for thermal energy systems modeling, techno-economic evaluations, and thermal energy storage investigations
• Industry experience with data center cooling systems
• Experience with transient and complex systems simulation programs or languages such as

Modelica, TRNSYS, Simulink, and Aspen Plus

• Experience with independently authoring differential algebraic equation (DAE) models
• Co-simulation experience using Functional Mock-Up Interfaces (FMI) or similar co-simulation framework in scalable energy simulation products
• Experience in computation speed and optimization of high-dimensional stiff models
• Experience in developing reduced order models and application of advanced optimizers, e.g., CasADi, IPOPT etc.
• Physics-based whole-building energy model development experience
• Familiarity with Python, R or Julia programming languages
• Experience managing projects and teams
• Strong communication and technical writing skills

Preferred Qualifications:

• Familiarity with dynamic simulation models for data centers, district energy, HVAC control systems
• Familiarity with data center facility and technical loop cooling systems for co-locate, hyperscale and AI data canters
• Familiarity with the U.S. and international district energy systems
• Familiarity and industry experience with geothermal systems, such as geothermal power, geothermal direct use, and geo-exchange district energy systems

Knowledge of U.S. DOE geothermal research trends and funding mechanisms

Posted Salary Range: Minimum 132,900.00 Posted Salary Range: Upper 232,600.00

Our health and welfare benefits are designed to invest in you, and in the things you care about. Your health. Your well-being. Your security. Your future. Employees have access to medical, dental, vision, and basic life insurance, a 401(k) plan, and the ability to purchase company stock at a discount. Eligible employees may also enroll in a deferred compensation plan or the Executive Deferral Plan. Jacobs has an unlimited U.S. Personalized Paid Time Off (PPTO) policy for full-time salaried/exempt employees, seven paid holidays, one floating holiday, and caregiver leave. And certain roles may be eligible for additional rewards, including merit increases, performance discretionary bonus, and stock.

The base salary range for this position is $132,900.00 to $232,600.00. Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status. Job posted on November 21, 2025. This position will be open for at least 3 days.

We value collaboration and believe that in-person interactions are crucial for both our culture and client delivery. We empower employees with our hybrid working policy, allowing them to split their work week between Jacobs offices/projects and remote locations enabling them to deliver their best work.

Your application experience is important to us, and we’re keen to adapt to make every interaction even better. If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team via .