Senior Mechanical Engineer

Why You’ll Love Working Here:

• A culture that values integrity, teamwork, and professional growth


• Opportunities to lead and contribute to game-changing projects


• An ownership mindset—our ESOP structure means your success is our success


• Competitive compensation & benefits


• Emphasis on work-life balance and flexibility


• A leadership team that listens and supports your ambitions

At Guernsey, we’re more than engineers, architects, and consultants—we’re changemakers with a shared purpose. We’re driven by curiosity, united by collaboration, and committed to building a better future—together. We’re redefining what it means to work in the AEC industry, blending innovation with integrity and giving every employee a real stake in the outcome. Here, your ideas matter, your growth is prioritized, and your career has limitless potential.

What You’ll Be Doing:

Design Leadership

• Lead the execution of complex HVAC system designs using advanced engineering techniques and technologies.


• Conduct energy modeling, life cycle cost analysis, and feasibility studies for proposed systems.


• Drive innovation in system selection, integration, and sustainability strategies.


• Oversee the production of construction documents and specifications

Team & Project Leadership

• Provide mentorship and technical guidance to junior and mid-level engineers.


• Coordinate cross-discipline design efforts and lead internal quality reviews.


• Manage scope, schedule, and deliverables on key projects.


• Support proposal development and pursuit strategy, including go/no-go planning.

Client & Business Engagement

• Build and maintain strong relationships with clients and industry partners.


• Attend client meetings and lead technical discussions.


• Support business development efforts through project interviews, client presentations, and marketing activities.

Technical Focus Areas

• HVAC load calculations and energy analysis


• Equipment selection and system layout


• Ductwork and hydronic piping system design


• Controls and automation system design


• Plumbing and domestic water systems


• Code compliance, LEED integration, and sustainable design best practices

What You Bring to the Team:

• Bachelor’s degree in Mechanical Engineering or related field


• Licensed Professional Engineer (PE) required


• 15+ years of experience in mechanical building systems design


• Strong proficiency in AutoCAD, Revit, and Microsoft Office Suite


• Excellent communication, leadership, and mentoring skills


• Proven ability to manage complex projects and deliver high-quality outcomes


• Familiarity with energy modeling software (e.g., Trane TRACE, EnergyPlus) is a plus

Essential Physical Functions: 

• Sit/stand at a desk or computer


• Walk, stoop, stand and move around job sites


• Travel and occasional site visits requiring stooping, standing, and lifting up to 30 lbs.


• Frequent communication via phone, video, or in-person meetings


• Ability to focus on digital and paper-based information for extended periods


• Some project-based travel may be required

Let’s Build the Future Together!

If you’re ready to make an impact, challenge the status quo, and grow with a forward-thinking, employee-owned company, we want to hear from you. Apply now and let’s create something extraordinary!

We Are an Equal Opportunity Employer

Guernsey is proud to be an Equal Employment Opportunity/Affirmative Action employer.