Critical Environments Operator (Level 1-4)

Aurora, IL Wood Dale, IL Lombard, IL Full time About the Role We are building a pipeline of talented Critical Environments Operators across all experience levels — from associates just starting their careers in data center operations to seasoned lead technicians ready to mentor others and drive operational excellence. As a Critical Environments Operator at CyrusOne, you will be part of a 24/7/365 Operations & Maintenance team responsible for keeping mission‑critical data center infrastructure running at peak reliability. You will operate, monitor, and maintain electrical, mechanical, and HVAC/R systems while upholding the highest standards of safety, workmanship, and customer service. Whether you are early in your career or bringing years of hands‑on experience, there is a place for you here — and a clear path forward. What You Will Do Monitor and operate data center mechanical, electrical, and HVAC/R systems to ensure continuous uptime and reliability Respond to building system alarms, prioritizing critical load protection, equipment preservation, and root cause analysis Execute Preventive Maintenance work orders and follow SOPs, MOPs, EOPs, and MMRs as appropriate Use a Computerized Maintenance Management System (CMMS) to track work orders, labor hours, and PMs Coordinate with contractors and vendors; enforce Lockout/Tagout and other safety protocols Perform equipment and system operational modifications, including critical switching and safe working area setup Maintain awareness of and compliance with all company, government, and client policies, procedures, and EHS requirements At senior levels: provide mentorship to junior operators, lead critical switching events, and participate in capacity planning and reporting Levels & Experience This is an evergreen posting that supports hiring across four levels. The right level for you will be determined based on your experience and qualifications during the interview process. Level I: No prior data center experience required. Ideal for candidates eager to learn data center O&M, with 0–2 years in operations, maintenance, or customer service roles. Strong safety mindset and willingness to learn are the most important qualities. Level II: 3–5 years of experience in Tier 2, 3, or 4 data centers or a technical facility maintenance role. Entry‑level skills in electrical, mechanical, or HVAC/R disciplines — whether through a degree, trade program, or hands‑on work experience. Familiarity with CMMS and work order processes a plus. Level III: 5–7 years of data center or building engineering experience. Journeyman‑level skills in electrical, mechanical, or HVAC/R. Ability to operate independently, troubleshoot systems, stabilize operations during incidents, and guide less experienced team members. Level IV: 7+ years of relevant experience with demonstrated expertise at the journeyman or master level. Active HVAC certification or Journeyman/Master Electrician license preferred. Proven ability to lead operational activities, manage vendor relationships, and support team development. What We Are Looking For Strong commitment to safety — always Clear verbal and written communication skills Solid problem‑solving and decision‑making ability Proficiency with personal computers, including Microsoft Word and Excel Ability to manage multiple priorities in a fast‑paced, high‑stakes environment Willingness to work a flexible schedule, including on‑call rotation and extended hours during emergencies Team‑first mindset — promotes collaboration and shared success Desire to provide the highest levels of service to internal and external customers Work Environment This role operates in a fast‑paced, physically active data center environment. Candidates must be able to lift up to 50 pounds, perform considerable walking, bending, and standing, and be available for 24/7/365 shift work including after‑hours emergency response. Why CyrusOne? Career growth — a defined progression from Associate through Lead Operator and beyond, with ongoing investment in your development Cutting‑edge work — support AI, hyperscale, and cloud infrastructure for some of the world's most demanding customers Global scale — be part of a team operating across North America, EMEA, and APAC Award‑winning culture — 2026 Top Workplaces USA National Award winner, recognized for our people‑first environment Values‑driven — everything we do is grounded in CARE: Commitment, Accountability, Respect, and Excellence As part of our commitment to a safe and secure work environment, all offers of employment for this role are contingent upon successful completion of a background check and pre‑employment drug screening. CyrusOne is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, sex, sexual orientation, gender identity, religion, national origin, disability, veteran status, or other legally protected status. CyrusOne provides reasonable accommodation for qualified individuals with disabilities in accordance with the Americans with Disabilities Act (ADA) and any other state or local laws. We will respond to requests for reasonable accommodations to assist you in applying for positions at CyrusOne, or to submit a resume. CyrusOne may use artificial intelligence to assess how your application matches the job requirements. The final hiring decision is always made by our team. You may opt out of AI screening without affecting your candidacy. For additional details on opting out, or our AI Recruiting Policy click here . CyrusOne is committed to working with and providing reasonable accommodation to individuals with physical and mental disabilities. If you need special assistance or an accommodation while seeking employment, please email View email address on click.appcast.io or call: View phone number on click.appcast.io. We will make a determination on your request for reasonable accommodation on a case‑by‑case basis. CyrusOne is proud to be recognized as a Top Work Place by USA Today. Celebrated for our company culture, CyrusOne stands out for its commitment to core values such as community, agility, respect, an enjoyable workplace, ethics, and exceptional service. This accolade reflects CyrusOne’s dedication to creating an engaging, respectful, and growth‑oriented environment, underpinned by integrity, which not only enhances customer satisfaction but also contributes to the company’s overall success. CyrusOne is a leading global data center developer and operator specializing in delivering state‑of‑the‑art digital infrastructure solutions. With more than 50 high‑performance mission‑critical facilities worldwide, the Company ensures the continued operation of digital infrastructure for nearly 1,000 customers, including approximately 200 Fortune 1000 companies. CyrusOne’s leading global platform of hybrid‑cloud and multi‑cloud deployments offers customers colocation, hyperscale, and build‑to‑suit environments, which help enhance the strategic connections of their essential data infrastructures and support the achievement of sustainability goals. CyrusOne data centers offer world‑class flexibility, enabling clients to modernize, simplify, and rapidly respond to changing demands. Combining exceptional financial strength, a broad global footprint, and continued investment in key digital gateway markets, CyrusOne provides the world’s largest companies with long‑term stability and strategic advantage at scale. For more information, please visit cyrusone.com ( . All qualified applicants will receive consideration for employment without regard to race, color, sex, sexual orientation, gender identity, religion, national origin, disability, veteran status, or other legally protected status. The law requires CyrusOne to post a notice describing the Federal laws prohibiting job discrimination. For information regarding your legal rights and protections, please click on the following link: Know Your Rights ( CyrusOne will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay. Please see the Pay Transparency Nondiscrimination Provision ( for more information. As a Federal Contractor, CyrusOne is required to participate in the E-Verify Program to confirm eligibility to work in the United States. For information please click on the following link: E-Verify. ( #J-18808-Ljbffr CyrusOne