This role supports a highly dynamic lab environment responsible for the assurance, development, and lifecycle management of network infrastructure technologies. The lab operates as a critical testing ground where platforms and services are validated, deployed, and evolved to support the broader network experience. In this position, you’ll partner with cross-functional teams including Lab Engineering, Marketing, Operations, Security, Technology, and key vendor partners. The environment is fast-paced and collaborative, requiring adaptability and strong coordination across multiple stakeholders. Unlike a traditional data center, this lab setting is continuously evolving, with frequent changes driven by new technologies and business needs. As a Sr. Engineer – Critical Facilities, you’ll lead operations and construction support for an enterprise scale critical facility. You’ll own vendor maintenance and repairs, emergency and fault response, and day to day operations of power, cooling, controls, and life safety systems that must be available 24 x 7. You’ll balance hands on engineering work with vendor management, project leadership, and customer interaction, ensuring the lab can safely and reliably support current and next generation network technologies. Job Responsibilities:Core hours: Monday–Friday, 8:00 a.m. – 5:00 p.m. PT, plus participation in an on-call rotation. Conduct daily site walks to review and QA ongoing tickets (maintenance, break/fix, customer projects), confirming vendor and customer needs are fully met. Direct and manage vendors for upgrades and Operations-initiated projects, ensuring quality, safety, and adherence to scope, schedule, and budget. Maintain vigilant safety awareness in a complex, high-risk environment with critical infrastructure and diverse occupants. Identify, troubleshoot, and drive resolution for tactical issues discovered during walks or reported by customers, seeing them through to final solution. Participate in construction and project meetings, collaborating as both service provider and customer to ensure Operational and critical facility requirements are represented. Share in an on-call rotation with a teammate to provide 24 x 7 emergency response coverage for facility-impacting events. Oversee day-to-day operation of facility infrastructure in close collaboration with vendors, maintaining resilience and performance targets. Produce routine, periodic, and ad hoc reports as requested (operations, incidents, capacity, risk, etc.). Apply strong budget awareness to maintenance, projects, and recommendations, dynamically balancing cost, risk, and customer need. Dedicate at least 20% of your time to “moving the bar forward” through continuous improvement, innovation, and initiatives that increase resiliency, efficiency, and customer experience. Education and Work Experience:Bachelor's Degree plus 3 years of related work experience. OR advanced degree with 1 year of related work experience. OR combination of education and experience deemed equivalent (Required)Acceptable areas of study include Engineering, facilities, or related field (Preferred)4-7 years' Experience in mechanical/ HVAC, electrical, or a combination of the two. (Preferred)4-7 years' Experience in data center facilities operations, working with equipment mentioned above, preferably in the telecommunications industry. (Preferred)4-7 year's Experience managing vendor work and quality control. (Preferred)4–7 years of direct experience operating, designing, constructing, maintaining, and managing large-scale production data centers or critical facilities at the enterprise level. Demonstrated engineering leadership across disciplines required to sustain continuous availability (power, cooling, controls, fire/life safety, etc.). Proven experience in critical facility operations and construction support, including vendor management, maintenance programs, fault analysis, and emergency response. Experience in lab, R&D, or development environments supporting evolving technology stacks is a strong plus. Knowledge, Skills and Abilities:You’ll support and lead operations and construction for large-scale, high-availability critical infrastructure, including:AC and DC power systems: UPS, generators, rectifiers, and low- to medium-voltage distribution supporting megawatt-scale infrastructure and continuous availability. Cabinet-level power engineering: Design and support failover and redundancy strategies to achieve zero downtime from utility through end use. High-performance, high-density cooling: From rooftop units to critical and contained cooling systems serving both people spaces and high-density infrastructure. Building envelope / property management: Oversight in a multi-tenant facility, coordinating building systems and services to meet critical operation’s needs. Fire and life safety systems: Pre-action and wet sprinklers, nitrogen sprinklers, gaseous fire suppression systems, and VESDA / pre-alert detection and discharge systems. Building Management Systems (BMS) and capacity tools: Monitoring, control, and failover operations for power and environmental systems to sustain emergency operations. Physical security systems: Security cameras, badge access, and related controls across the facility. Project management: Partner with A/ E firms, vendors, contractors, and internal stakeholders—from large-scale consulting engagements to individual product/user requests—to evaluate and implement new technologies and critical systems changes. Soft Skills:This is a laboratory environment, not a static data center. Success here means you can:Conceptualize and co-design solutions with customers, solving facility-related challenges in a development environment with constant demand for innovation and collaboration. Support a wide variety of needs—from infrastructure for radios, devices, non-standard equipment, and lab configurations to both temporary and permanent solutions. Listen deeply to customers, translate feedback into clear, actionable solutions, and pick up cues that help you design approaches tailored to tactical priorities. Work to “future-proof” every project as much as possible within priority, schedule, and budget constraints, recognizing the pace of change in lab environments. Manage multiple priorities and dynamic customer demands while appropriately balancing facility risk, particularly in a lab setting that can be more variable than a traditional hardened facility. Communicate effectively at all levels of leadership and engineering, translating complex technical issues and contributing constructively in each forum. Work effectively with an extremely culturally diverse customer base, actively supporting and modeling T-Mobile’s Diversity, Equity & Inclusion principles in how you collaborate and make decisions. Licenses and Certifications:Certified Reliability leader (Preferred)Uptime Institute (Preferred)LEED, CFM, FMP, MCE (Preferred)At least 18 years of age. Legally authorized to work in the United States. Travel:Travel Required (Yes/ No): Yes. DOT Regulated:DOT Regulated Position (Yes/ No): No. Safety Sensitive Position (Yes/ No): No. Base Pay Range: $90,300 - $162,800 Corporate Bonus Target: 15%The pay range above is the general base pay range for a successful candidate in the role. The successful candidate’s actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range. At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee’s eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance. To find the pay range for this role based on hiring location, ID=REQ 351096¶dox=1