Principal Mechanical Engineer

Principal Mechanical Engineer at Therma, a Legence Company

Location:

San Jose, CA (Onsite)

Therma is seeking a Principal Mechanical Engineer with 10+ years of relevant experience to lead the mechanical design of high-performance, energy-efficient building systems. This is a senior technical and leadership role, working closely with clients, architects, and internal teams from project inception through completion. Our ideal candidate is a strategic thinker and hands‑on problem solver who thrives on building strong client relationships and delivering innovative mechanical solutions.

You will serve as both a technical expert and mentor, guiding engineers in the design of HVAC, plumbing, and mechanical systems for a variety of commercial, industrial, and institutional projects.

• Lead and oversee all phases of mechanical system design, including HVAC, plumbing, and mechanical infrastructure for new construction and retrofit projects.
• Manage projects from concept through construction, ensuring quality, budget, and schedule goals are met.
• Collaborate with owners, architects, engineers, and contractors to develop innovative, energy‑efficient solutions tailored to client needs.
• Provide technical leadership, mentorship, and quality control for engineering staff.
• Review and approve contractor submittals, shop drawings, and technical documents for compliance with project requirements.
• Evaluate mechanical design proposals for feasibility, cost‑effectiveness, and operational performance.
• Conduct site visits to assess existing systems and verify installation quality.
• Specify system components and direct modifications to meet performance standards and client expectations.

• 10+ years of mechanical engineering experience, with progressive responsibility in consulting engineering.
• EIT or PE license required (California PE preferred).
• Proven track record in project management and client interfacing.
• Experience with cooling/heating plants, MEP design, and energy‑efficient systems.
• Proficiency in Revit and AutoCAD.
• Strong knowledge of building codes, industry standards, and sustainable design practices.

• Mechanical, HVAC, and plumbing system design expertise.
• Construction and field coordination experience.
• Energy analysis and sustainable design implementation.
• Skilled in reviewing submittals, drawings, and technical specifications.

• Bachelor’s Degree in Mechanical Engineering (or related field) required.

We are unable to provide immigration sponsorship for this position.

About Legence

Legence (Nasdaq: LGN) is a leading provider of engineering, consulting, installation, and maintenance services for mission‑critical systems in buildings. The company specializes in designing, fabricating, and installing complex HVAC, process piping, and other mechanical, electrical, and plumbing (MEP) systems—enhancing energy efficiency, reliability, and sustainability in new and existing facilities. Legence also delivers long‑term performance through strategic upgrades and holistic solutions. Serving some of the world’s most technically demanding sectors, Legence counts over 60% of the Nasdaq‑100 Index among its clients.

Health & Welfare:
Company Paid medical, dental, vision, prescription drug, accident & sickness benefit, basic group life and AD&D, and Employee Assistance Program.

Time Off Benefits:
Paid vacation, company‑paid holidays, and paid sick leave.

Financial Benefits:

401(k) retirement savings plan.

If you need assistance or accommodations during the application or interview process, please contact us at or your dedicated recruiter with the job title and requisition number.

Legence and its affiliate companies are proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), marital or familial status, national origin, age, disability, genetic information (including family medical history), political affiliation, military service, other non‑merit‑based factors, and any other characteristic protected under applicable local, state or federal laws and regulations.

EEO is the Law.