Senior Building Mechanical Engineer

Jacobs; San Antonio (TX); Hybrid; USD 114,000 - 208,000; Full time

Benefits offered by this job

Health insurance

401(k) plan

Stock purchase program

Paid time off

Job summary

Jacobs is seeking a Senior Building Mechanical Engineer in Texas to lead design and analysis of HVAC, plumbing, odor control, and fire protection for water and wastewater facilities. You will prepare drawings, coordinate with disciplines, and assist during construction.

You’ll mentor designers, manage quality and schedule, and interact with clients and vendors while delivering integrated solutions for complex infrastructure projects.

Qualifications

• Bachelor’s degree in mechanical engineering or related field.
• 10+ years’ experience in HVAC, plumbing, and fire protection designs for design‑build.
• Professional Engineer (PE) license.
• Strong data analysis, problem‑solving ability, organizational skills, and multitasking in a fast‑paced environment.

Responsibilities

• Lead design and analysis of mechanical systems for water and wastewater facilities.
• Prepare drawings and specifications for client submission and permitting support.
• Coordinate with architects, other engineers, and technicians on projects.
• Ensure quality and manage project schedules; support construction phase and submittals.
• Mentor designers/drafters and junior engineers.

Skills

Data analysis

Organizational skills

Multitasking

Problem solving

Education

Bachelor's degree in mechanical engineering

PE license

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

As a Senior Building Mechanical Engineer at Jacobs, you’ll bring innovation and excellence to some of the most exciting infrastructure projects in the West Central region. You’ll use your exceptional design and analytical skills to lead, plan, design and focus on mechanical (plumbing, HVAC, odor control, and fire protection) systems for water and wastewater treatment‑related facilities, which typically feature process treatment buildings, administration and operations buildings, laboratories, maintenance buildings, and occasional assignments for other business units, including federal and military programs, industrial, and institutional projects.

You will prepare design drawings and specifications for submission to clients, as well as provide jurisdictional plan checks and permitting support. Engineered systems you’ll be working with include plumbing systems, HVAC package systems, central plants, air distribution, hydronic systems, odor control systems, and associated controls.

You will also have the opportunity to

• Design complete plumbing systems, including utility and potable water distribution systems, drainage systems, and miscellaneous systems such as compressed air and natural gas.
• Design complete HVAC systems, including package type and central plants.
• Design odor control systems, including vapor and liquid phase treatment technologies.
• Design fire protection systems using a performance system approach.
• Prepare calculations for plumbing systems, including water and drainage flows, water heater sizing, and pump sizing and selection.
• Perform calculations for design, such as air loads, pipe/duct/equipment sizing, ventilation requirements, static pressure, odor removal, lifecycle costs, and energy analyses.
• Select equipment, coordinate with equipment vendors, and edit specifications.
• Conduct field evaluations and develop as‑built drawings.
• Develop master plans and perform field investigations.
• Conduct technology alternatives analyses using multi‑criteria analysis tools for selecting odor control systems.
• Manage and coordinate work with architects, technicians, and engineers of other disciplines.
• Attend meetings and communicate with clients, vendors, and other project stakeholders to establish project needs and discuss design issues.
• Manage quality and schedule of work and interface with clients.
• Support field staff during construction phase of projects, including responding to submittal reviews and requests for information.
• Provide design guidance and mentorship to designers/drafters and less experienced engineers.

Here’s what you’ll need

• Bachelor’s degree in mechanical engineering, or related engineering discipline.
• 10+ years’ experience in producing HVAC, plumbing, and fire protection designs and providing services during construction for design‑build projects
• Professional Engineer (PE) license
• Motivation, strong data analysis skills, technical problem‑solving ability, organizational skills, and the ability to effectively multitask in a fast‑paced environment.

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 $114,400.00 to $207,650.00. 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 August 28, 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.