Principal Mechanical Engineer

Therma, a Legence company

For over 50 years, Therma () has continued to redefine the mechanical construction landscapes in California. Renowned for outstanding client service and attention to detail, we balance innovative, facility‑specific solutions with a pragmatic, cost‑conscious approach. Today, the firm employs more than 1,100 people in 3 regional offices, and its clients represent a diverse range of market sectors, including Biopharmaceutical, Education, Healthcare, Food & Beverage, Commercial, Industrial and Data Center facilities.

Our culture is open, innovative, collaborative, and fun – all reflected in recognition of Therma as a #1 Best Place to Work on multiple occasions. We create an environment that empowers & challenges employees, giving them the greatest opportunity to succeed.

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.

Key Responsibilities

• 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.

Qualifications

• 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.

Desired Skills

• 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.

Education

• 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.

Benefits Overview

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,…