Senior Diesel Mechanic​/Fleet Mechanic

About Concordia Wireless

Concordia Wireless is a growing telecommunications services company supporting major wireless carriers across the United States. Our fleet and field equipment are critical to daily operations, and we are seeking an experienced Senior Diesel Mechanic / Fleet Mechanic to help keep our vehicles, trailers, and equipment operating safely and efficiently.

This is a hands‑on role for a highly skilled mechanic who can independently diagnose, repair, and maintain a wide variety of fleet vehicles, trailers, and field equipment in both shop and field environments.

20% travel in this role, up to 150 miles out from Carol Stream. On occasion, you will need to travel to a remote site to assist a tower crew with a vehicle out of service.

• $40+ per hour based on experience, skill level, and certifications.

• 401(k) with company match
• Medical, dental, and vision insurance through BCBS
• Company‑paid life insurance
• Short‑term and long‑term disability benefits
• Vacation pay and sick pay
• 10 paid holidays minimum plus 1 floating holiday per year
• Endless opportunities for growth and advancement

• Diagnose, troubleshoot, and repair diesel trucks, gas trucks, box trucks, medium‑duty trucks, pickup trucks, vans, and service vehicles.
• Inspect, maintain, and repair utility trailers, enclosed cargo trailers, flatbeds, equipment trailers, and small trailers.
• Repair and replace trailer components including brakes, lights, wiring, axles, suspension, couplers, jacks, ramps, decking, wheel bearings, tires, and other DOT safety items.
• Perform advanced diagnostics and electrical repairs using OEM diagnostic scanners for manufacturers such as Stellantis, Mercedes-Benz, and others.
• Replace engines, transmissions, and other major drivetrain components.
• Perform preventive maintenance including oil changes, filters, fluids, brakes, tires, batteries, belts, hoses, lighting, suspension, steering, and drivetrain service.
• Troubleshoot and repair engine, charging, starting, hydraulic, brake, steering, suspension, fuel, and cooling system issues.
• Maintain and repair forklifts, generators, compressors, pumps, and small construction or field‑support equipment as needed.
• Respond to urgent repair needs and occasional field breakdowns to minimize downtime.
• Complete repair orders, inspection forms, service documentation, and parts tracking accurately.
• Help mentor junior mechanics and shop helpers on proper diagnostics, repairs, and safety procedures.
• Maintain a clean, safe, and organized work environment.
• Willingness to travel up to 150 miles one way to help service vehicles or equipment that have broken down

• 10+ years of mechanic experience required; 15–20+ years preferred.
• Strong experience working on diesel trucks, gas vehicles, trailers, and fleet equipment.
• Ability to independently diagnose and repair mechanical and electrical issues.
• Experience with medium‑duty trucks, box trucks, pickups, vans, trailers, and service vehicles.
• Strong understanding of brakes, electrical systems, hydraulics, suspension, steering, drive trains, cooling systems, and DOT safety requirements.
• Experience performing advanced electrical diagnostics using OEM scanners and diagnostic software.
• Valid driver’s license required.
• CDL license, ASE certifications, welding/fabrication experience, hydraulic repair experience, and forklift repair experience are a plus.
• Must provide basic mechanic tools.

We’re looking for a dependable, experienced mechanic who takes pride in their work, can work independently with minimal supervision, and understands the importance of keeping fleet vehicles and equipment safe, reliable, and operational for field crews.