Job Description

Posting Date

09/22/26

Application Deadline

10/06/26

Pay Range

$23.75 - $40.25 hourly

Salary offers are based on the candidate's equivalent experience and internal equity with other employees within the same job classification. The position is eligible for overtime compensation for all hours worked over 40 in the designated workweek.

Job Type

Unclassified

Department

Transportation

About the Position

The Materials Testing Technician Senior performs comprehensive quality-assurance testing of transportation project materials, specializing in soils, aggregates, asphalt, and concrete. The position primarily works in a laboratory setting and supports field operations as needed. This role performs and oversees materials testing, inspections, research, and investigations of construction materials, applying industry-standard methodologies for roadway and bridge construction and maintenance, while ensuring full compliance with applicable standards, specifications, and provisions. As a key member of the team, this position directly supports the safety, quality, and reliability of public infrastructure, making a meaningful and lasting impact on the community we serve. The Materials Testing Technician Senior serves as the primary support to the laboratory supervisor by coordinating and delegating daily work activities and assisting in the training, mentoring, and development of lab technicians to ensure high-quality, efficient, and consistent operations. This role offers hands-on experience with advanced and emerging materials testing and nondestructive evaluation technologies.

About Us

We value your time. The time with your family. The time you spend on the road. And the time you spend making a difference. At the Maricopa County Department of Transportation (MCDOT), we provide connections that improve people's lives. By combining innovative technologies with the vast talent of our employees, we plan for future needs and operate a transportation system with the community in mind. Are you interested in contributing to the community in which you work, live, and play? Then, join our team and help us build connections.

Proud to Offer

• Work with a greater purpose
• Tuition reimbursement
• Exceptional work-life balance
• Opportunities for growth and development within Maricopa County
• Low-cost, high-value healthcare for you and your qualifying dependents
• Child care benefits, including access to the Maricopa County Kids Club, dedicated to serving Maricopa County families
• Paid vacation, sick time, and parental leave
• Extensive wellness program, including an incentive
• Enrollment in the Arizona State Retirement System, a defined retirement benefit requiring an 11.98% per paycheck contribution rate that includes a 100% employer match on Day 1
• Want to learn more about the County’s Qualifying and Compensation Philosophy? Follow this link to learn more! Work With Us | Maricopa County, AZ

We Require

• Two years of progressively responsible experience in construction materials testing, public works materials inspection, or related engineering technician duties work involving the testing and evaluation of construction materials
• Associate’s degree or two years of college coursework in Construction Technology, Engineering, Engineering Technology, Materials Science, or another related field relevant to construction materials testing
• Must possess certifications for ATTI Soil and Aggregate, ATTI Asphalt, and ACI Strength

Other Requirements

• Successful candidates must currently possess, or have the ability to obtain, a valid Arizona driver's license by the time of hire
• Must possess ATTI Field Certification and Nuclear Gauge and Radiation Safety certification, or have the ability to obtain within six months of hire date
• Must possess ACI Field certification, or have the ability to obtain within twelve months of hire date

We Also Value

• Additional experience in materials testing for transportation or infrastructure projects
• Working knowledge of AASHTO and ASTM standards and testing procedures
• Experience with laboratory equipment calibration, maintenance, and quality control practices
• Experience working in both laboratory and field environments under varying conditions
• Strong organizational, analytical, and problem-solving abilities, with effective communication skills for technical reporting

Job Contributions

• Perform laboratory testing of all construction materials utilized in the construction of assigned projects
• Conduct field sampling and testing to verify the adequacy of construction materials and methods
• Participate in proficiency sample testing and support on-site certification inspections conducted by national certifying agencies to ensure compliance with applicable standards
• Complete, analyze, and report results for assigned research/investigation and special testing projects in accordance with established procedures and supervisory direction
• Prepare, review, and submit testing reports and summaries for accuracy and compliance
• Perform and oversee maintenance, calibration, and verification of laboratory testing equipment
• Assist in training, mentoring, and guiding Laboratory Technicians to ensure quality and consistency in testing procedures
• Coordinate and assign daily work activities to support laboratory operations, acting on behalf of the laboratory supervisor as needed
• Perform other duties as assigned

Working Conditions

• This position requires the employee to be in the office/field or customer-facing for all hours worked
• Exerting 50 - 100 pounds occasionally, 10 - 25 pounds frequently, or up to 10 - 20 pounds constantly
• The work will occur in an office and field environment. While performing the duties and responsibilities, the employee may be exposed to loud noise, noxious odors, unsanitary conditions, chemicals, electricity, moving mechanical parts, varying weather conditions, and other related conditions and situations. Position is subject to atmospheric conditions: fumes, odors, dust, mists, gases, or poor ventilation

Machines, Tools, Equipment, Software, and Hardware

Light truck, coring rig, and laboratory testing equipment for soils, aggregates, asphalt, and concrete; heating and burn-off ovens; and standard hand tools such as pliers, screwdrivers, cutting tools, and diamond saws. Software includes Microsoft Office, Workday, temperature-logging applications, Asphalt Institute R18 LabQMS, and software for operating and controlling testing equipment. Hardware includes computers and monitors. Light trucks; coring rigs; laboratory and field-testing equipment for soils, aggregates, asphalt, and concrete; heating and burn-off ovens; standard hand and power tools, including pliers, screwdrivers, cutting tools, and diamond saws; and advanced and emerging materials testing and nondestructive evaluation (NDE) technologies. Software includes Microsoft Office, Workday, temperature-logging applications, Asphalt Institute R18 LabQMS, and specialized software for operating, controlling, and processing data from testing equipment. Hardware includes computers, monitors, data acquisition devices, and associated computer peripherals.

Protective Equipment Required

All MCDOT employees are required to wear Personal Protective Equipment (PPE) if visiting or working in the field. PPE will be issued by MCDOT once employed.

Selection Procedure

• Consideration will only be given to candidates who submit online applications
• Candidates will be contacted primarily through email and their Workday online application profile
• Must pass a pre-employment background and/or fingerprint investigation as required by statute or policy, including drug and alcohol testing requirements for positions designated as safety-sensitive

Maricopa County is an equal opportunity employer and is committed to providing equal employment opportunities to all applicants. If you require a reasonable accommodation during the application process or to perform the essential functions of the position under the Americans with Disabilities Act (ADA), please contact MHRFeedback@maricopa.gov to initiate the interactive process.

Apply Now!