Plumbing engineer Jobs in Oshawa, ON

Join to apply for the

Senior Engineer - Mechanical

role at

Tatham Engineering .

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 to fill a new role of Senior Engineer for our Mechanical Engineering department. This position can be based out of our

Collingwood, Barrie

or

Guelph

office.

The successful candidate will be responsible for completing mechanical engineering designs and projects serving a range of sectors including Commercial, Institutional, Industrial, and Municipal Buildings. These projects involve multiple systems such as HVAC, domestic water, sanitary and storm drainage, building automation and fire protection systems. Knowledge of applicable codes, standards and regulations are required to complete these projects. Work assignments may include design of mechanical systems for buildings, condition assessments of existing systems, report writing, performing site inspections, and providing direction to contractors.

The successful candidate will also be responsible for mentoring junior staff, project management and business development, and collaborating on multi-disciplinary projects with clients, architects, and other design team members.

Key Position Requirements

P.Eng. in the Province of Ontario

A 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 assetExperience 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 2025

and

Canada’s Top Small & Medium Employers of 2025 .

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.

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Engineering and Information Technology

Industries

Civil Engineering

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