Senior HVAC Engineer# Career Opportunities## Senior HVAC EngineerApply: CA.
ON.
Mississauga.2285 Speakman Drive: Full time: Posted Today: End Date: November 30, 2026 (30+ days left to apply): R-165839###

Job Description
## Overview We are seeking a highly experienced Senior HVAC & Mechanical Lead Engineer (P.
Eng.) to lead the mechanical design and multidisciplinary execution of complex infrastructure projects. In this role, you will oversee the complete lifecycle
- from concept through contract administration
- for HVAC for Nuclear Power Plants.
This position requires experienced individuals who are self-starters capable of working independently and leading/supervising junior engineers. The individuals will work in a fast-paced team workplace performing engineering services for Nuclear Power Plants within a matrix organization.## Your role* Lead detailed design for HVAC and cooling systems. Supervise, train, and mentor junior and intermediate engineers, technologists.
* Perform complex heat load calculations, equipment sizing (including high-capacity chillers, boilers, and pumps), piping /duct sizing, and hydraulic modeling, fluid flow analysis and pressure drop calculations.
* Perform conceptual and detail design activities for HVAC and supporting systems which include preparation of ducting and instrumentation diagrams, detail drawings and equipment arrangement/layouts.
* Support design registration submissions related to power plants (both conventional and/or nuclear), other commercial, etc.
* HVAC equipment sizing and selection (AHU, FCUs, Stack etc.), prepares technical specifications, datasheets, engineering quotation request, technical tender evaluation and vendor document review.
* Review design calculations, analysis reports, documents, and drawings in support of design verification.




* Design specialized environmental systems for Class 1 Zone 1 & 2 hazardous locations.
* Ensure full adherence to local, provincial, and national codes and standards including OBC, NFC, NFPA (including NFPA 820), ASHRAE, TEMA, API, and AODA. ASME (B31.1/B31.3, Section VIII) is an asset.
* Interface directly with regulatory bodies (TSSA, MOE, Enbridge).
* Define mechanical work scope, performing cost estimates, support proposal preparation, monitoring and reporting project progress and communicating with clients.
* Collaborate with architectural, structural, electrical, and process control disciplines to integrate mechanical designs smoothly. Conduct technical, conceptual and detailed design meetings with peers, clients, and suppliers. Conduct site visits at site and suppliers.
* Vendor development, technical evaluation for purchasing equipment, engineering estimates, budgets, schedules, and deliverables in accordance with Quality Management Systems.
* Assist with proposal preparation, technical writing, and fee estimates to win competitive bids, respond to RFIs and evaluate vendor proposals. Prepare and review engineering quotation requests and technical evaluations. Review and approve supplier’s capability to fabricate the required component within the applicable requirements.
* Review field change notices, shop drawings, conduct site inspections, and resolve design deviations,



and oversee deficiency resolutions and commissioning support.
* Provide engineering support to quality surveillance, manufacturing, assembly and testing with non-conformances. Evaluate the completeness and status of delivered equipment. ## About you* Engineering degree from an accredited University in Mechanical Engineering, Chemical Engineering or Engineering Science.
* Registered Professional Engineer in a Province of Canada, qualified to seal mechanical and chemical engineering documents.
* A minimum of 15–20+ years of progressive experience in industrial plant, mechanical building services and infrastructure engineering. Strong knowledge of closed loop cooling water supply and chilled water supply systems is essential.
* Experience for Nuclear Power plant will be an asset. Solid understanding of process systems, P&IDs;, material selection and fundamentals of equipment design. Solid understanding and experience with equipment sizing, selection, and troubleshooting issues.
* Experience working in or performing design work for systems within a nuclear facility licensed in Canada or outside Canada.
* Working knowledge of/experience with the CSA B51 standard, ANSI B31.1, ASME B31.3 codes, and other power plants applicable standards or regulatory guides.
* This is a leadership role; the successful candidate is expected to have demonstrable experience leading a team of technical professionals.
* Strong written and oral communication skills are essential.
* Willing to travel to and potentially work full or part-time at Project sites to meet corporate needs (Note: the initial site location is at the Mississauga head office in Ontario).*Additional, preferred

qualifications:
*
* Experience performing work according to nuclear power plants procedures,

📌 Senior HVAC Engineer (Mississauga)
🏢 AtkinsRéalis Group
📍 Mississauga