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Job Description

Overview

The Senior Plant Maintenance Technician is a key technical leader responsible for ensuring the reliability, safety, and efficiency of plant equipment and systems. This role includes advanced troubleshooting, repair expertise, and mentoring for junior technicians while driving preventive maintenance programs and supporting continuous improvement initiatives.

Responsibilities

  • Maintain, troubleshoot, repair, and install various types of equipment throughout the plant.
  • Perform evaluations of plant equipment to improve availability, capability, and yield.
  • Study trends to identify systemic plant maintenance needs.
  • Participate in broad-scale plant maintenance initiatives.
  • Work with vendors to procure plant maintenance support.
  • Develop reports on plant capacity and yield and related maintenance activities.
  • Maintain appropriate plant maintenance records in technological systems.
  • Conduct MSHA pre-shift safety inspections of equipment and work areas.
  • Maximize performance of stationary equipment through timely repairs and preventive maintenance.
  • Check, repair, and replace pumps, conveyors, gearboxes, and screens to minimize downtime.
  • Operate cranes, man-lifts, welding and cutting tools, and other specialty equipment.
  • Perform fabrication, erection, and repair of processing and mobile equipment.
  • Review and prioritize maintenance backlog with the Supervisor and/or Plant Manager.
  • Complete required paperwork to maintain equipment compliance with standards.
  • Train and coach other employees on maintenance best practices.
  • Be flexible and adaptable to evolving job demands.

Requirements

  • High school diploma, GED, or equivalent experience.
  • 3+ years of related experience in Heavy-Duty Maintenance or related field, preferably in the Aggregates Industry.
  • Knowledge of equipment analysis and general repair concepts.
  • Strong troubleshooting skills.
  • Critical thinking and problem-solving abilities.
  • Detail-oriented with good time management skills.
  • Knowledge of MSHA compliance and regulation.
  • Effective communication skills, both written and spoken.

Benefits

  • Health Insurance
  • Dental
  • Vision
  • PTO
  • 401k

Additional Information

  • Must be able to lift and carry up to 50 lbs.
  • Required to bend, stoop, climb, and reach.
  • Must maintain three points of contact when climbing on/off machinery or ladders.
  • Work in all weather conditions and areas with noise levels up to 85 dbs.

Benefits

Health Insurance
Dental
Vision
PTO
401k
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How this job compares in Irwindale, CA

Pay in context

At roughly $36/hr, this posting lands within a few percent of the $34/hr median for welding jobs across California, whose middle half runs $28–$44/hr across 428 postings with published pay. Put another way, it pays more than about 56% of the comparable postings we have wage data for. In other words it is a market-rate offer, so benefits, overtime, and shift schedule are where the real difference between this and the next posting on the list shows up.

The local market in Irwindale, CA

Irwindale, CA currently has 8 other active welding openings besides this one, spread across 5 employers. 2 of them were added in the last week. Across California as a whole we're tracking 565 other active welding openings from 259 employers. That's enough local activity to be worth comparing two or three offers before committing. Browse every welding job in Irwindale, or widen the search to California.

Martin Marietta currently has 1 other opening live in California, which is usually a sign of either steady growth or steady turnover — worth asking which in the interview.

The most active employers in California at the moment, by number of open welding reqs, are SpaceX (37), Relativity Space (21), and Honeywell Aerospace (17). Volume like that usually means either a genuine expansion or a staffing agency working several client sites — worth knowing which before you apply.

Within California, the best-paying metros we track by median hourly rate are Long Beach at $49/hr, Santa Ana at $48/hr, and Los Angeles at $43/hr. If you can relocate or commute, that spread is worth factoring in.

Similar openings near Irwindale, CA

Pay figures are medians computed from live postings in the Welding Pros index, not from survey data, and they move as employers post. Senior Plant Maintenance figures were last recalculated when this page was built.