Lead Mechanical Engineer - Building Services

Are you an experienced engineering professional eager to advance your career with a dedicated, community-focused, award-winning company? Tatham Engineering offers the opportunity to join a supportive team that values mentorship and provides challenging, rewarding work. Put your knowledge and experience to meaningful use in an environment where collaboration and growth are encouraged.


We are seeking a Lead Mechanical Engineer to lead the design and execution of complex projects across the Commercial, Institutional, Industrial, and Municipal sectors. This role requires technical expertise in HVAC, domestic water, sanitary and storm drainage, building automation, and fire protection systems.
The ideal candidate will balance technical design with project management and the mentorship of junior staff. There is significant potential to evolve into a business development-focused role, increasing your client-facing presence and helping shape the firm's growth and partnerships.
This position can be based out of our Collingwood, Barrie or Guelph office.
Key Responsibilities
▪ Prepare mechanical engineering designs and provide support to technicians and other staff;
▪ Prepare design calculations in accordance with codes and published standards;
▪ Prepare and review specifications and construction contract documents;
▪ Utilize software including AutoCAD or REVIT as a tool to complete design work;
▪ Delegation of tasks to staff and review of work completed by staff;
▪ Assist to mentor and develop junior staff
▪ Build relationships with existing clients, potential clients, agencies, contractors and suppliers;
▪ Identify project opportunities in existing and new project areas
Key Position Requirements
▪ P.Eng. in the province of Ontario, registered with PEO
▪ Degree in Mechanical Engineering or related discipline
▪ Minimum of 10 years of mechanical engineering experience in the consulting industry
▪ Working knowledge of the Ontario Building Code, and associated standards including ASHRAE, CSA and NFPA.
▪ Detailed engineering experience with mechanical systems including preparation of calculations and reports, equipment selection, and design of HVAC, plumbing, fire protection, and building automation systems.
▪ Experience preparing specifications for equipment and associated systems
▪ Proficiency in AutoCAD software
▪ Full knowledge of Microsoft Office Suite
▪ Experience with REVIT would be an asset
▪ Experience with decarbonization and energy efficiency retrofits would be an asset
▪ Experience with business development would be an asset
▪ Strong communication and interpersonal skills
▪ Excellent technical and analytical skills
▪ Enthusiasm to work in a team structure and a willingness to guide, help and collaborate with others


How to Apply
Click the “Apply Now” button below and follow the instructions to create your account. Please include your resume and contact information.
We thank all candidates for applying, however only those selected for an interview will be contacted.
Tatham Engineering does not use artificial intelligence in the hiring process. All applications are reviewed by Human Resources and the appropriate hiring managers.
Why Tatham?
At Tatham, our key values are reflected in everything we do. We aim to be the engineering consulting firm of choice by upholding our core values: Service, Communication, Teamwork, Relationships & Community. Our company has experienced significant growth by putting these values into action.

What We Offer
• Competitive compensation, benefits, health spending account, RRSP matching and profit sharing
• Flexible work arrangements and work-life balance
• Paid volunteer opportunities
• Vacation starting at 3 weeks minimum for all positions – prorated in the first year
• Challenging and rewarding work on notable projects
• Professional development, training, mentorship program and career progression opportunities
• Reimbursement for annual professional dues
• Collaborative and engaging workplace environment
• Regular office/team socials and recreational outings, including an activity allowance for approved events
• Shareholder opportunities
Company Information

Tatham Engineering is a Canadian employee-owned, consulting engineering firm that specializes in Coastal, Land Development, Municipal, Structural (Buildings and Bridges), Transportation, Water Resources, Water & Wastewater, Electrical and Mechanical engineering, and provides specialized services in Air & Noise, Climate Resilience and Hydrogeology. The firm was founded in Collingwood, Ontario, in 1988 and currently employs over 200 staff with branch offices in Barrie, Bracebridge, Guelph, Orillia and Ottawa.

Tatham is proud to be recognized as one of Southwestern Ontario’s Top Employers of 2026 and Canada’s Top Small & Medium Employers of 2026!

Diversity, Inclusion, and Accommodations

Tatham Engineering is an equal opportunity employer that values diversity in the workplace and welcomes applications from all qualified candidates. We are committed to ensuring the selection process is inclusive, accessible, and barrier-free. If you require accommodation, please contact Human Resources at hr@tathameng.com and the request will be addressed confidentially.

Expected Hiring Range for This Position

$115,000 to $165,000

Compensation will reflect the unique skills and experience each candidate brings to the role. The posted range serves as a general guideline, and final offers may vary.