Mechanical Engineer - Federal

Jacobs; St. Louis (MO); Hybrid; USD 90,000 - 120,000; Full time

Benefits offered by this job

401(k) plan

Stock purchase program

Paid time off (PPTO)

Job summary

Jacobs is seeking a Mechanical Engineer with strong HVAC design experience to develop conceptual designs, equipment plans, and BMS control philosophies for multi‑discipline building projects. You will perform load calculations, create airflow diagrams, and help manage project budgets and schedules.

The role requires a PE license or the ability to obtain within 1 year, 4+ years of HVAC design experience, and proficiency in Revit and energy modeling tools.

Qualifications

• Bachelor’s degree in Mechanical engineering.
• PE license or ability to obtain within 1 year of employment.
• 4+ years of HVAC/Mechanical design experience (DoD/Defense preferred).
• Experience in a multi-discipline environment.
• Experience with Revit and load calculation/energy modeling software.

Responsibilities

• Develop conceptual and design documentation for HVAC/utility systems.
• Create equipment, piping, and distribution plans including BMS control philosophy and sequences of operations.
• Perform load calculations and energy modeling.
• Review submittals, respond to RFIs, and conduct field visits to verify construction.
• Lead and mentor staff, coordinate with RevIt designers, and travel as required.

Skills

HVAC design

Multi-discipline teamwork

Project mentoring

Education

Bachelor’s Degree in Mechanical Engineering

Tools

Revit

Trane Trace 700

Trace 3D Plus

Carrier HAP

Job description

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

At Jacobs, we’re not just building structures, we’re helping our clients innovate and grow by designing, engineering, and executing the construction of state-of-the‑art facilities that are changing our world. We push the limits of what’s possible to make the world smarter, more connected, and more sustainable.

Bring your curiosity, talent for multi‑tasking and collaboration, and extreme organizational skill and we’ll help you grow, pursue, and fulfill what drives you – so we can make big impacts on the world, together.

Your role will include

Developing overall Conceptual and Basis of Design level design approaches and documentation. Developing HVAC and plant utility systems philosophies. Developing mechanical / utility equipment and construction specifications. Performing temperature / humidity control / utility load calculations. Developing airflow diagrams, pressurization plans, and classification, as well as ductwork and piping plans. Developing equipment plans, plant utility distribution plans, and system details. Developing building management system (BMS) control philosophy, details, and Sequence of Operations.

Performing construction assistance in the form of submittal reviews, RFI responses, and field visits to verify construction of Mechanical / Utilities scope is executed per the intent of the design and assisting in start‑up of systems when required. Directing activities of Revit Designers as well as use Revit when necessary. Managing and developing mechanical / utilities scope for project budgets and schedules. Traveling as required for client development and project implementation.

Here’s what you’ll need

• Bachelor’sDegree in Mechanical engineering
• ProfessionalEngineer (P.E.) license (or ability to obtain within 1 year of employment)
• At least4years relevant professional experience for HVAC/Mechanical buildings‑related design projects (Federal including DoD, Federal Civilian and/or Defense Contractor project experience preferred)
• Experience working in a multi‑discipline environment
• Experience with Revit
• Proficiency in load calculation / energy modeling software such as Trane Trace 700, Trace 3D Plus, Carrier HAP, etc
• Knowledge of building codes & standards (International Mechanical Code, UFC’s etc.)
• Excellent written and verbal communication skills
• United States Citizenship

Ideally, you’ll also have

• Experience leading project teams and mentoring junior staff
• Experience designing hydronic heating and cooling systems including air cooled chillers, water cooled chillers, and hot water boiler systems
• Experience with Navisworks and Bluebeam

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, 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 $90,000.00 to $120,000.00. 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 February 16, 2026. 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 Careers Support.