Derek Calloway

Profile

Senior Maintenance Technician with 11 years of hands-on experience in commercial and industrial facility upkeep, specializing in HVAC systems, electrical troubleshooting, and preventive maintenance program management. Reduced unplanned downtime by 34% at a 420,000 sq ft distribution center by redesigning the PM schedule and introducing condition-based monitoring. EPA 608 Universal certified and OSHA 30 compliant.

Work Experience

Senior Maintenance TechnicianMar 2019 - Present

Hartwell Distribution Partners, Columbus, OH

Redesigned the facility's 480-point preventive maintenance schedule, cutting unplanned equipment downtime by 34% and saving an estimated $112,000 annually in emergency repair costs.
Diagnosed and repaired 3-phase electrical systems, conveyor drives, and pneumatic controls across a 420,000 sq ft warehouse, maintaining 99.1% mechanical uptime over 24 consecutive months.
Mentored 4 junior technicians through structured OJT programs, reducing average work-order completion time by 18% within six months of program launch.

Maintenance Technician IIJun 2015 - Feb 2019

Crestline Manufacturing LLC, Dayton, OH

Performed corrective and preventive maintenance on CNC machining centers, hydraulic presses, and compressed-air systems serving a 12-line production floor, achieving a 97.4% equipment availability rate.
Installed and calibrated 22 variable-frequency drives (VFDs) as part of an energy-efficiency retrofit, reducing facility energy consumption by 19% and lowering monthly utility costs by $8,400.
Responded to after-hours breakdown calls with an average response time of 28 minutes, keeping production line stoppages under 45 minutes per incident across 3 years.

Maintenance Technician IAug 2012 - May 2015

Graystone Property Services, Cincinnati, OH

Executed routine and corrective maintenance across a portfolio of 9 commercial office buildings totaling 1.1 million sq ft, completing 95% of work orders within the SLA window.
Serviced and repaired rooftop HVAC units, boilers, and chilled-water systems, extending average equipment service life by an estimated 2.3 years through consistent PM adherence.
Reduced tenant-reported HVAC complaints by 41% over 18 months by implementing a quarterly filter-and-coil inspection cycle that had previously been performed annually.

Skills

HVAC Systems (Commercial & Rooftop Units) · Electrical Troubleshooting (3-Phase, 480V) · Preventive & Predictive Maintenance (PM/PdM) · PLC Diagnostics (Allen-Bradley) · Variable-Frequency Drives (VFDs) · Hydraulic & Pneumatic Systems · CMMS Software (Fiix, eMaint) · EPA 608 Universal Certification · OSHA 30 – General Industry

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