Senior Mechanical Engineer

C.-H.-Guernsey-; Oklahoma City (OK); On-site; USD 120,000 - 180,000; Full time

Job summary

Guernsey in Oklahoma City seeks a senior Mechanical Engineer with a PE license to lead complex HVAC design projects. You will mentor engineers, coordinate multi-discipline teams, and drive energy analyses and sustainability strategies.

You will build client relationships, participate in meetings, and guide pursuit strategies while delivering high-quality, code-compliant designs. This is a leadership-focused opportunity with growth potential.

Qualifications

• Bachelor’s degree in Mechanical Engineering or related field
• PE license required
• 15+ years in mechanical building systems design
• Proficiency in AutoCAD, Revit, and Office Suite
• Strong communication, leadership, and mentoring skills
• Proven ability to manage complex projects
• Familiarity with energy modeling software like TRACE or EnergyPlus

Responsibilities

• 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
• Provide mentorship and technical guidance to junior 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.
• Build and maintain strong relationships with clients and industry partners.
• Attend client meetings and lead technical discussions.
• Support business development through project interviews and marketing activities.

Skills

Communication

Leadership

Mentoring

Education

Bachelor’s degree in Mechanical Engineering or related field

PE license

Tools

AutoCAD

Revit

Microsoft Office Suite

Energy modeling software (TRACE, EnergyPlus)

Job description

• 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
• 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:

• 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
• 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!

We Are an Equal Opportunity Employer

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

Qualifications

Skills

Required

AutoCAD

Intermediate

Revit

Intermediate

Education

Required

Bachelors or better in Mechanical Engineering or related field.

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities
This employer is required to notify all applicants of their rights pursuant to federal employment laws.For further information, please review the Know Your Rights notice from the Department of Labor.