The Company

STACK INFRASTRUCTURE (STACK) provides digital infrastructure to scale the world’s most innovative companies. We are an award‑winning industry leader in building, owning, and operating highly efficient, cost‑effective wholesale, colocation, and cloud data centers. Each of our national facilities meets or exceeds the highest industry standards in all operational categories of availability, security, connectivity, and physical resilience. STACK offers the scale and geographic reach that rapidly growing hyperscale and enterprise companies need. The world runs on data. Data runs on STACK.

The Position
STACK is looking for a Critical Operations Technician (COT) to support a local data center campus. As a member of STACK’s Critical Operations team, the COT must possess robust knowledge in maintaining the mechanical, electrical, fire life safety, base building, and other various internal data center systems. The COT will also be focused on the execution of programs related to Safety, Team, Availability, Communication, and Knowledge and will be responsible for day‑to‑day operations of the data center.

Responsibilities

Implement and follow the standardized culture of always working safely across all STACK data centers.

Operate, monitor, maintain, and respond to abnormal conditions in facilities systems including Electrical, Mechanical, Building Monitoring, and Control.

Track and trend operational characteristics.

Provide feedback to management on the effectiveness of existing standards and processes.

Work with the Critical Operations Manager to complete an aggressive preventive and predictive maintenance schedule.

Assist with the database management of maintenance discrepancies and work with site management to resolve site issues based on agreed‑upon priorities.

Ensure data center operates at maximum operational efficiency, including analyzing existing operating conditions, recommending new technologies, and improving overall efficiency.

Manage systems to avoid unplanned, customer‑impacting outages.

Follow direction from data center management regarding the data floor and back of house mechanical loading capacity to ensure the cooling system is operating at its highest efficiency.

Coordinate and oversee power installations and upgrades.





Navigate and utilize a CMMS system.

Use developed procedures to solve problems.

Assist in asset and consumable inventory management.

Track and properly label all equipment per established procedures.

Provide day‑to‑day exceptional customer service and support.

Escalate, respond to, and write follow‑up reports on incidents.

Maintain and complete regular facility and security tours, documenting and responding to found issues.

Provide applied mechanical and integrated control expertise for the entire data center.

Serve in a technical writing capacity for the derivation of procedures for preventative or corrective maintenance activities.

The job may require taking on on‑call duties outside of normal working hours.

Take on other duties as required by STACK.

The Details

Location: Scarborough, ON

Travel: None or less than 5%

Benefits: Healthcare, Dental Care, Vision Insurance, Life Insurance, Paid Time Off, Paid Leave Programs

Must be eligible to work in Canada.

Must pass a comprehensive background screening.

Work hours may vary based upon business needs.

Job duties, roles, and responsibilities are subject to change over time.

Must‑have Qualifications

High school diploma or equivalent.

Minimum of 3–5 years’ experience in a data center or other related mission‑critical operations role.

Experience with Microsoft Office applications and other database hosting software.

Ability to handle multiple tasks and work well in stressful situations.

Strong understanding of the electrical and mechanical systems used in a data center environment, including UPS, Transformers, PDUs, RPPs, chiller, CRAH, CRAC, STS, ATS, and pre‑action systems.

Strong knowledge of NFPA70e, NFPA72, NFPA25, and compliance issues as well as building codes regarding fire life safety.

Familiarity and experience in data center trending and analysis,



with the ability to rapidly learn and use PC‑based site monitoring systems.

United States Navy Nuclear Engineering or other formal Nuclear Engineering experience – preferred.

Bachelor’s Degree or equivalent work experience – preferred.

While performing the duties of this job, the employee is occasionally required to stand, walk, sit, use hands to handle, reach or feel objects, climb stairs, balance, stoop or kneel, talk, see at close range, and hear for extended periods of time.

Must be able to lift and/or move up to 25 pounds.

Must be willing to work outside normal business hours, including weekends, late nights, holidays, and on‑call support.

Must be comfortable working in a high‑stress, fast‑paced environment with shifting priorities.

Compensation Range
$40.00 – $42.50

This Might Be Right For You If

You are a strong communicator, persuasive and clear, blending analytics with experience in decision‑making.

You do not get flustered easily, and can juggle multiple priorities while balancing urgent requests with shifting timelines and deliverables.

You are a team builder, taking the time to understand and develop the strengths of your resources while formulating long‑term plans for the growth and success of the team.

You are naturally curious and driven toward continual improvement, celebrating successes while reviewing and analyzing campaigns for future learning.

WHY STACK?

We offer a competitive compensation package with strong benefits, including medical, dental, and vision insurance, a 401(k) program, flexible spending accounts, and a cell phone subsidy.

We foster a culture of appreciation, including peer‑to‑peer recognition and rewards programs.

Fun is part of our DNA, with events, game nights, happy hours, and barbecues.

We’re growing – this is a great time to join and make an impact!

STACK is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity and expression, age, national origin, mental or physical disability, genetic information, veteran status, or any other status protected by federal, state, or local law.

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📌 Critical Operations Technician I (Ontario)
🏢 Stack Infrastructure
📍 Ontario