At LiquidStack, we’re redefining what’s possible in the data center world. As a global leader in advanced liquid cooling solutions, we’re powering the future of AI, edge computing, and high-performance systems. Our team is growing, and we’re looking for skilled professionals who want to be part of something innovative and impactful.
Ideal candidates will be located near major customer hubs, with a preference for candidates based in Denver, CO (supporting Mountain/West Coast coverage).** POSITION SUMMARY LiquidStack is a fast-growing technology company delivering advanced liquid cooling solutions for mission‑critical data center and high‑performance computing environments. We are seeking a Senior Field Service Technician to serve as a technical owner in the field—leading complex installations, startups, and commissioning activities while acting as a trusted technical partner to customers.
This highly visible, hands‑on role goes beyond break/fix service. The Senior FST independently executes complex field work, mentors junior technicians, and serves as on‑site technical authority during installations, commissioning, outages, and critical events. The successful candidate arrives fully credentialed and ready on day one; LiquidStack provides product‑specific orientation but no foundational trade, certification, or technical‑skills training outside of required safety programs.
ESSENTIAL DUTIES AND RESPONSIBILITIES Field Execution & Technical Ownership Lead on‑site installation, startup, commissioning, validation, preventive maintenance, and corrective service of LiquidStack liquid cooling systems; serve as the primary technical escalation point in the field prior to Engineering involvement
Support emergency response, outages, and time‑sensitive customer events when required
Perform advanced troubleshooting across mechanical, hydronic, electrical, controls, and thermal subsystems; isolate root cause across hardware, software, power, fluid quality, or environmental factors
Operate diagnostic instrumentation (multimeters, megohmmeters, manometers, IR cameras, refrigerant recovery, flow meters, pressure transducers); lead pressure testing, flow balancing, fluid fills, leak checks, and acceptance testing during commissioning
Read and work from electrical schematics, P&IDs;, mechanical drawings, and sequence‑of‑operations documents; redline drawings when as‑built conditions differ from design
Coordinate work within mission‑critical 24x7 data center environments including UPS, PDU, generators, ATS, BMS/DCIM, CRAC/CRAH,



fire suppression, and chilled‑water plant; adhere to badge access, escort, change‑control, and chain‑of‑custody policies at every customer site
Customer & Site Leadership Act as LiquidStack’s senior technical representative at customer sites; communicate clearly and calmly with customer IT, facilities, engineering, and management stakeholders at the appropriate level of detail, especially during critical infrastructure events
Support customer acceptance testing and formal system handover
Deliver basic operational training and system overviews to customer technical teams; field technical questions and represent product capability accurately
Documentation, Quality & Continuous Improvement Complete detailed service reports, commissioning documentation, and root‑cause analyses
Partner with Engineering, Manufacturing, Quality and Supply Chain to resolve recurring field issues; contribute to service procedures, checklist, and training materials
Use service ticketing systems (e.g., ServiceNow, Salesforce Field Service, or equivalent) to track work, log time against tasks, document resolutions, and ensure timely closure; maintain SLA compliance and clean shift handoffs to ensure continuity of operations
Mentorship & Scaling Support Train junior FST’s and customer‑side data center technicians on LiquidStack equipment, troubleshooting, and best practices; lead pre‑job briefing, JSAs, and post‑job debriefs; serve as on‑site escalation point during complex troubleshooting; communicate status, blockers, and lessons learned across the service team
SPECIFIC KNOWLEDGE, SKILLS, AND ABILITIES 5+ years of field service experience supporting HVAC, HVAC R, chillers, industrial cooling, power, or mission critical infrastructure
Proven experience leading equipment startups, commissioning, and troubleshooting in customer environment
High school diploma or GED require
Valid driver’s license and passport
Willingness to travel approximately 75% (primarily domestic with occasional international travel)
EPA 608 Universal Certification (Types I, II, and III) required at offer to legally service the full pressure range,



including low‑pressure chillers, without supervision
OSHA 10 (General Industry) required; OSHA 30 and NFPA 70E (arc flash) strongly preferred and may be required by customer sites before performing energized electrical work
Lockout/tagout (LOTO) competency required for safe servicing of energized mechanical and electrical systems in live data centers
Ability to read and work from electrical schematics, P&IDs;, mechanical drawings, and sequence‑of‑operations documents without supervision
Working knowledge of hydronic loops, pumps, heat exchangers, CDUs (coolant distribution units), manifolds, and pressure/flow control
Familiarity with data center infrastructure: UPS, PDU, generators, ATS, BMS/DCIM, CRAC/CRAH, fire suppression, and raised floor or slab environments
Strong verbal and written communication; able to brief customers, peer technicians, engineers, and managers at the appropriate technical depth, remain calm during critical events, conduct customer handovers, and deliver operational training
Willingness to participate in 24x7 on-call rotation and respond to critical infrastructure emergencies
Ideal candidates will be located near major customer hubs, with a preference for candidates based in Denver, CO (supporting Mountain/West Coast coverage). Preferred Experience supporting data centers, hyperscale facilities, or other high‑availability environments
Hands‑on experience with high‑density liquid cooling (direct‑to‑chip, immersion, rear‑door heat exchangers, manifold‑based distribution)
Prior experience with hyperscale, colocation, or enterprise data center operators (e.g., Equinix, Digital Realty, Flexential, CoreSite, Compass, QTS); NOC/SOC/IOC or DCT II/III experience a plus
Work Environment & Physical Requirements Work performed at customer data centers, mechanical rooms, and industrial environments; extended hours, nights, or weekends during commissioning or critical events
Ability to push or carry up to 75lbs. with assistance; routine bending, squatting, kneeling, and overhead reaching ; climbing ladders and elevated platforms; reliable transportation; on‑call rotation; adherence to customer site safety, and PPE protocols at all times
Why Join Us? Competitive pay with opportunities for overtime
Consistent day‑shift schedule
Paid time off, holidays, and outstanding benefits
Be part of an industry‑disrupting company with room to grow
Work on cutting-edge technologies in a collaborative, supportive setting

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📌 Senior Field Service Technician (Ontario)
🏢 LiquidStack
📍 Ontario