Overview The Commissioning Engineer plays a critical role in ensuring the successful start-up, testing, and validation of all systems within a data center facility. This position is responsible for planning, coordinating, and executing commissioning activities across all disciplines—mechanical, electrical, controls, and integrated systems ensuring compliance with design intent, client specifications, and Tier certification standards (Uptime / TIA-942). The ideal candidate will have a strong technical background, deep understanding of MEP and ELV systems integration, and experience in mission-critical environments. Location & Travel Details You’ll get the opportunity to travel across the US, helping our team build infrastructure projects. This is a traveling position, requiring travel up to 100% of the time. You may support projects located in various states throughout the US. Potential project locations may include, but are not limited to, PA, KS, NC, SC, VA, GA, TX, FL, IA, WY, and additional locations are added frequently as our organization continues to grow. COMPANY OVERVIEW Founded in 1979, Lemartec is a national general contractor and construction management firm and is part of the General Building group within MasTec’s Clean Energy and Infrastructure segment. As MasTec’s vertical construction arm, Lemartec delivers complex projects across industrial, aviation, power, and large commercial markets. Led at the segment level by Manny García-Tuñón, the General Building Operating Group represents MasTec’s vertical construction capabilities and serves as the platform for future growth in this space. As a MasTec company, Lemartec maintains international capabilities and strategic partnerships throughout the Americas and the Caribbean, enabling the execution of some of the most complex projects in the industries we serve. Through MasTec’s network of more than 22,000 professionals and subject matter experts in Engineering, Procurement, and Construction across over 400 locations throughout North America and the Caribbean, Lemartec is uniquely positioned to serve a diversified customer base. With experience across all 16 disciplines of construction, Lemartec combines deep technical expertise with the strength, scale, and financial backing of MasTec to successfully deliver projects of any size and complexity. The General Building operating group is part of the MasTec Clean Energy & Infrastructure (CE&I) business segment. The CE&I segment generates over $4.5 billion in annual revenue, providing construction services across our renewables, industrial, infrastructure, and general building operating groups. Sustainability and safety are foundational to our culture and influence everything we do. MasTec, a minority-owned Fortune 500 company, has shaped the construction industry for more than 90 years. With over 35,000 employees and 400 offices nationwide, we provide flexibility and career growth in dynamic work environments. Join one of the largest construction firms in the country (Engineering News-Record [ENR]: #1 in Power, #17 Top 50 Domestic Heavy Contractors, #20 Transportation Contractor). Responsibilities Commissioning Planning & Execution Develop and maintain detailed commissioning plans, schedules, and procedures aligned with project milestones. Coordinate with design, construction, and operations teams to ensure systems are installed, tested, and commissioned per specification. Lead commissioning activities across all systems including: Electrical: LV/MV systems, UPS, generators, busbar, power distribution, earthing, and lighting. Mechanical: Chillers, CRAHs, CRACs, pumps, AHUs, piping, and BMS integration. Controls/Automation: SCADA, BMS, EPMS, fire alarm integration, access control, CCTV, and leak detection. Oversee vendor Factory Acceptance Tests (FATs) and Site Acceptance Tests (SATs). Ensure adherence to IST (Integrated Systems Testing) protocols prior to client handover. Documentation & Quality Control Review design drawings, method statements, and commissioning procedures for technical completeness and alignment with project scope. Maintain commissioning logs, issue trackers, and punch lists through Cx software or project CDE (Aconex, Procore, etc.). Ensure all test documentation is correctly executed, witnessed, and recorded. Prepare detailed commissioning reports, O&M manuals, and final turnover documentation. Interface & Coordination Work closely with construction teams, consultants, vendors, and client representatives to coordinate test readiness and resolve site issues. Chair or participate in commissioning meetings, providing progress updates and identifying critical path items. Support the T&C Manager in planning and coordinating the IST phase, ensuring system interdependencies are properly tested. Compliance & Safety Ensure all commissioning activities comply with HSE policies, local authority regulations, and manufacturer guidelines. Validate that system performance meets design intent, operational parameters, and Tier certification requirements. Participate in risk assessments and method statement reviews for high-risk commissioning tasks. Qualifications Work Experience and Education: Bachelor’s Degree in Mechanical, Electrical, or Building Services Engineering (or equivalent technical qualification). 7+ years’ experience in testing and commissioning. Proven experience in end-to-end commissioning from pre-functional checks through IST and client witness testing. In-depth understanding of MEP systems integration, controls logic, and redundancy design (N+1, 2N). Familiarity with Uptime Institute or TIA-942 standards is an advantage. Proficiency in MS Office, Primavera / MS Project, and commissioning software tools. Knowledge/Skills/Abilities: Familiarity with local specifications and supplements to each and with reading blueprints and Proficiency in planning, scheduling, and production, in P6, Microsoft Project or equivalent software and in Microsoft Office suite of software-Excel/Word/Outlook also needed along with estimating software knowledge. Excellent organizational, presentation and interpersonal skills. High degree of professionalism and strong work ethic Multi-tasks and stay focused on the big picture while addressing daily issues In addition to the above listed minimum requirements, candidates who poses the following skills, experience, and capabilities may receive greater consideration during the evaluation process: Ability to travel within the U.S What's in it for you: Financial Wellbeing Compensation $110k-$150k+ / year, commensurate with experience Competitive pay with ongoing performance review and merit increase 401(k) with company match & Employee Stock Purchase Plan (ESPP) Flexible spending account (Healthcare & Dependent care) Health & Wellness Medical, Dental, and Vision insurance (plan choice) - coverage for spouse, domestic partner, and children Diabetes Management, Telehealth Coverage, Prescription Drug Plan, Pet Insurance Family & Lifestyle Paid Time Off, Paid Holidays, Bereavement Leave Military Leave, including Differential Pay and Benefits Continuation Employee Assistance Program Planning for the Unexpected Short and long-term disability, life insurance, and accidental death & dismemberment Voluntary life insurance, accident, critical illness, hospital indemnity coverage Emergency Travel Assistance Program Group legal plan Position may be subject to pre-employment screening, which may include background check and drug testing. Accessibility: If you need accommodation as part of the employment process, contact ceicareers@mastec.com. Due to the high volume of applications received, we are unable to respond to individual requests regarding application status. Please log into your candidate profile for up-to-date information. MasTec, Inc. is an Equal Employment Opportunity Employer. The Company's policy is not to unlawfully discriminate against any applicant or employee on the basis of race, color, sex, sexual orientation, gender identity, religion, national origin, age, disability, genetic information, military status, or any other consideration made unlawful by applicable federal, state, or local laws. The Company also prohibits harassment of applicants and employees based on any of these protected categories. It is also MasTec's policy to comply with all applicable state, federal and local laws respecting consideration of unemployment status in making hiring decisions. Disclaimer: MasTec and our Subsidiaries will never ask prospective employees for any form of payment or money transfer as part of job application or onboarding. We do not ask prospective employees for information about credit cards or personal passwords, and it does not require applicants to purchase equipment or software. Ensure that all recruiter email addresses end in @mastec.com or @talent.icims.com. If you suspect you are the target of a scam, we advise you to contact your local law enforcement agency and report fraud at https://reportfraud.ftc.gov/. MasTec Clean Energy & Infrastructure and our subsidiaries do not work with any third-party recruiters or agencies without a valid signed agreement and partnership with the Corporate Talent Acquisition Team. #LI-SL1 #LI-ONSITE Commissioning Planning & Execution Develop and maintain detailed commissioning plans, schedules, and procedures aligned with project milestones. Coordinate with design, construction, and operations teams to ensure systems are installed, tested, and commissioned per specification. Lead commissioning activities across all systems including: Electrical: LV/MV systems, UPS, generators, busbar, power distribution, earthing, and lighting. Mechanical: Chillers, CRAHs, CRACs, pumps, AHUs, piping, and BMS integration. Controls/Automation: SCADA, BMS, EPMS, fire alarm integration, access control, CCTV, and leak detection. Oversee vendor Factory Acceptance Tests (FATs) and Site Acceptance Tests (SATs). Ensure adherence to IST (Integrated Systems Testing) protocols prior to client handover. Documentation & Quality Control Review design drawings, method statements, and commissioning procedures for technical completeness and alignment with project scope. Maintain commissioning logs, issue trackers, and punch lists through Cx software or project CDE (Aconex, Procore, etc.). Ensure all test documentation is correctly executed, witnessed, and recorded. Prepare detailed commissioning reports, O&M manuals, and final turnover documentation. Interface & Coordination Work closely with construction teams, consultants, vendors, and client representatives to coordinate test readiness and resolve site issues. Chair or participate in commissioning meetings, providing progress updates and identifying critical path items. Support the T&C Manager in planning and coordinating the IST phase, ensuring system interdependencies are properly tested. Compliance & Safety Ensure all commissioning activities comply with HSE policies, local authority regulations, and manufacturer guidelines. Validate that system performance meets design intent, operational parameters, and Tier certification requirements. Participate in risk assessments and method statement reviews for high-risk commissioning tasks. Work Experience and Education: Bachelor’s Degree in Mechanical, Electrical, or Building Services Engineering (or equivalent technical qualification). 7+ years’ experience in testing and commissioning. Proven experience in end-to-end commissioning from pre-functional checks through IST and client witness testing. In-depth understanding of MEP systems integration, controls logic, and redundancy design (N+1, 2N). Familiarity with Uptime Institute or TIA-942 standards is an advantage. Proficiency in MS Office, Primavera / MS Project, and commissioning software tools. Knowledge/Skills/Abilities: Familiarity with local specifications and supplements to each and with reading blueprints and Proficiency in planning, scheduling, and production, in P6, Microsoft Project or equivalent software and in Microsoft Office suite of software-Excel/Word/Outlook also needed along with estimating software knowledge. Excellent organizational, presentation and interpersonal skills. High degree of professionalism and strong work ethic Multi-tasks and stay focused on the big picture while addressing daily issues In addition to the above listed minimum requirements, candidates who poses the following skills, experience, and capabilities may receive greater consideration during the evaluation process: Ability to travel within the U.S What's in it for you: Financial Wellbeing Compensation $110k-$150k+ / year, commensurate with experience Competitive pay with ongoing performance review and merit increase 401(k) with company match & Employee Stock Purchase Plan (ESPP) Flexible spending account (Healthcare & Dependent care) Health & Wellness Medical, Dental, and Vision insurance (plan choice) - coverage for spouse, domestic partner, and children Diabetes Management, Telehealth Coverage, Prescription Drug Plan, Pet Insurance Family & Lifestyle Paid Time Off, Paid Holidays, Bereavement Leave Military Leave, including Differential Pay and Benefits Continuation Employee Assistance Program Planning for the Unexpected Short and long-term disability, life insurance, and accidental death & dismemberment Voluntary life insurance, accident, critical illness, hospital indemnity coverage Emergency Travel Assistance Program Group legal plan Position may be subject to pre-employment screening, which may include background check and drug testing. Accessibility: If you need accommodation as part of the employment process, contact ceicareers@mastec.com. Due to the high volume of applications received, we are unable to respond to individual requests regarding application status. Please log into your candidate profile for up-to-date information. MasTec, Inc. is an Equal Employment Opportunity Employer. The Company's policy is not to unlawfully discriminate against any applicant or employee on the basis of race, color, sex, sexual orientation, gender identity, religion, national origin, age, disability, genetic information, military status, or any other consideration made unlawful by applicable federal, state, or local laws. The Company also prohibits harassment of applicants and employees based on any of these protected categories. It is also MasTec's policy to comply with all applicable state, federal and local laws respecting consideration of unemployment status in making hiring decisions. Disclaimer: MasTec and our Subsidiaries will never ask prospective employees for any form of payment or money transfer as part of job application or onboarding. We do not ask prospective employees for information about credit cards or personal passwords, and it does not require applicants to purchase equipment or software. Ensure that all recruiter email addresses end in @mastec.com or @talent.icims.com. If you suspect you are the target of a scam, we advise you to contact your local law enforcement agency and report fraud at https://reportfraud.ftc.gov/. MasTec Clean Energy & Infrastructure and our subsidiaries do not work with any third-party recruiters or agencies without a valid signed agreement and partnership with the Corporate Talent Acquisition Team. #LI-SL1 #LI-ONSITE
