Senior Field Service Technician EV Charging Tier III

Charge Tronix
· Field-based (Southern California home base)
· Full-time
· Heavy travel. A senior DC fast-charger technician who is the escalation point for the hardest faults, commissions new sites, mentors Tier I/II techs, and owns uptime in the territory.

Charge Tronix designs and builds modular DC fast chargers that are made to be serviced in the field, not shipped back to a factory. We stand behind every unit we install, which means our field team is the product as far as the customer is concerned. You will work on our own hardware, with a direct line to the engineers who designed it, and what you find in the field changes what we build next.

This is the top technical field position on the service team. A Tier II technician fixes what the ticket says. A Senior (Tier III) technician is the person Tier II calls when the fix does not work, the person who commissions a new site and signs off that it is ready to charge, and the person who turns a pattern of repeat faults into a root cause and a field bulletin.

You will be responsible for a territory's uptime, mentor junior technicians, act as the primary on-site contact for customers and site hosts, and feed structured failure data back to engineering. You work independently with little supervision and are trusted to make safety and repair judgment calls on site.

Reports to: Field Service Manager. No direct reports; technical lead for Tier I/II technicians in the territory.

• Resolve the DC fast‑charger faults that Tier I/II could not: power electronics, control and communication boards, contractors, cooling systems, cable and connector assemblies, and vehicle interoperability failures.
• Repair at the component level where it is the right call (power modules, SECC/PD/MCU boards, power supplies, contractors, IGBTs, sensors) rather than defaulting to a full‑unit swap.
• Read and interpret PLC, CAN, and OCPP logs to isolate root cause; capture evidence (logs, photos, meter readings) for engineering and warranty.
• Provide remote phone and video support to junior technicians on live sites.

• Commission new installations: verify incoming 480 V service, grounding and bonding, torque values, firmware, network and backend (OCPP) registration, and payment/authorization.
• Run acceptance charge tests across multiple vehicle platforms and connector types (CCS1, NACS, CHAdeMO), and sign off that a site is ready for service.
• Maintain and update the test‑vehicle fleet (hardware, software, adapters) and run interoperability tests as new vehicles and NACS adapters enter the market.
• Execute field upgrade and retrofit campaigns (NACS cable and adapter retrofits, firmware rollouts, engineering change orders).

• Own uptime, mean time to repair, and first‑time‑fix rate for the sites in your territory, and report on them weekly.
• Perform scheduled preventive maintenance to the Charge Tronix PM checklist and recommend changes to it.
• Spot repeat‑fault patterns across sites, drive them to root cause, and write field service bulletins and work instructions so the fix scales.
• Manage truck stock and territory spares; tag and return failed parts with complete failure data for RMA and warranty.

• Train and ride along with Tier I/II technicians; sign off their readiness to work independently.
• Write and maintain SOPs, troubleshooting guides, and training material for the service team.
• Act as the primary on‑site contact for customers, site hosts, electrical contractors, utilities, and inspectors; explain technical issues to non‑technical people.

• Work as an NFPA 70E qualified person: perform job hazard analysis, lockout/tagout, arc‑flash risk assessment and…