Senior Field Service Technician

LiquidStack; Denver, Northern (CO, KY); Hybrid; USD 110,000 - 140,000; Full time

Job summary

LiquidStack is seeking a Senior Field Service Technician to lead on-site installations, startups and commissioning in mission-critical data center environments. You will act as the technical owner in the field, mentoring junior technicians and serving as the on-site authority during critical events.

Ideal candidates have 5+ years of field service in HVAC or related systems, EPA 608, and willingness to travel about 75% (domestic with some international). Denver area preferred.

Qualifications

• 5+ years of field service experience in HVAC, chillers, or mission-critical infra.
• Proven startup, commissioning, and troubleshooting experience in customer environments.
• High school diploma or GED required; EPA 608 certification required on offer.

Responsibilities

• Lead on-site installation, startup, commissioning, validation, preventive maintenance, and corrective service of LiquidStack systems.
• Support emergency response, outages, and time-sensitive customer events as needed.
• Troubleshoot across mechanical, hydronic, electrical, and controls subsystems; isolate root causes across hardware and software.

Skills

Field service

HVAC systems

Troubleshooting

Electrical schematics

Hydronic systems

Education

High school diploma

EPA 608 Certification

Tools

ServiceNow

Salesforce Field Service

Multimeters

IR cameras

Job description

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 24×7 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
• 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
• 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 24×7 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