Engineer Intern

Capitol Aggregates, Inc.; San Antonio (TX); On-site; USD 25,000 - 33,000; Full time

Job summary

Capitol Aggregates Inc. in San Antonio, TX, is seeking a Mechanical Engineering Intern to join the Maintenance and Reliability team.

You will gain hands-on experience in industrial maintenance, equipment reliability, planning, and CAD documentation while supporting safety and continuous improvement initiatives. You will rotate through maintenance functions, assist with inspections, condition monitoring, and parts planning, and collaborate with engineers and operations staff to learn practical

Qualifications

• Currently enrolled in a bachelor's degree program in Mechanical Engineering.
• Previous internship or industrial maintenance experience is helpful but not required.
• Experience with CAD software is preferred but not required.

Responsibilities

• Assist with equipment inspections, lubrication, oil sampling, and preventive maintenance.
• Document inspection findings and equipment conditions clearly.
• Assist with condition measurements using ultrasound and laser alignment.
• Support maintenance planning and parts ordering as needed.
• Create and update CAD drawings from field data.
• Collaborate with maintenance, reliability, and operations teams.

Skills

MS Office proficiency

AutoCAD proficiency

Analytical thinking

Read drawings

Attention to detail

Organizational planning

Verbal/written communication

Teamwork

Willingness to learn

Education

Bachelor's in Mechanical Engineering (enrolled)

Tools

AutoCAD

Job description

Capitol Aggregates, a division of Zachry, stands on a rich tradition of creativity, stability, innovation, and experience in the construction and building materials industry. Fully understanding that Capitol's employees are the heart of our success, we foster a dynamic work environment by providing development opportunities such as training, education, and career advancement.

We believe people are our greatest asset and offer a variety of training and development opportunities to promote excellence and facilitate career advancement. We take care of our team members as family, within a culture of service where we do the right thing because it is the right thing to do.

Our Core Values guide everything we do:

Every Person Matters | Together We Can Do Great Things | This Is More Than a Job

Position Overview

The Mechanical Engineering Intern works under the direction of the Maintenance Manager and rotates through different maintenance and reliability functions within the plant. This position provides hands‑on experience in industrial maintenance, equipment reliability, precision maintenance, planning, troubleshooting, and mechanical systems. The intern will work alongside maintenance and reliability teams to apply engineering concepts in a working cement plant while gaining practical experience with equipment, maintenance processes, technical documentation, and continuous improvement.

What You'll Do

• Assist with equipment inspections, lubrication routes, oil sampling, and other assigned preventative and reliability maintenance activities.
• Accurately document and communicate inspection findings, equipment conditions, and reliability data.
• Assist with equipment condition measurements using tools and technologies such as ultrasound and laser alignment equipment.
• Work alongside maintenance personnel to support the use of precision maintenance procedures and established equipment standards.
• Assist with organizing technical documentation and providing maintenance crews with drawings, equipment specifications, required clearances, torque values, equipment identification, and other technical information.
• Participate in planning and preparing maintenance work to support safe and efficient job execution.
• Create and update CAD drawings as needed using existing sketches, field measurements, or reverse engineering of parts and equipment.
• Research equipment manuals, drawings, specifications, and other technical resources needed to support maintenance activities.
• Assist the reliability team with troubleshooting equipment failures using available documentation, manuals, equipment history, and precision maintenance information.
• Support development of the weekly maintenance plan by reviewing required parts and materials, visiting job sites before work is scheduled, identifying potential issues, and researching technical specifications.
• Assist with identifying required replacement parts and maintaining accurate part information within the stockroom system.
• Support maintenance crews with fieldwork as needed and help provide the technical documentation and precision maintenance information necessary to complete assigned work.
• Assist with the organization, storage, and identification of specialized tools used to maintain plant equipment.
• Collaborate with maintenance, reliability, engineering, operations, and stockroom personnel to support assigned projects and maintenance activities.
• Maintain work areas and equipment in a safe, clean, and organized condition.
• Follow all Company and plant safety policies, rules, and procedures, as well as applicable MSHA regulations.

NOTE: This list presents only the principal duties of the position and is not intended to be comprehensive. Other duties and responsibilities may be assigned as dictated by business needs and conditions. As an essential function of the job, good attendance is required.

What You'll Bring

Required Skills and Abilities

• Proficiency with Microsoft Office applications.
• Working knowledge of AutoCAD or other CAD-based software.
• Strong analytical and problem-solving skills with an interest in mechanical equipment, maintenance, and reliability.
• Ability to read and interpret basic technical drawings, equipment documentation, and specifications.
• Strong attention to detail with the ability to accurately document findings and technical information.
• Strong organizational, planning, and time management skills.
• Effective verbal and written communication skills.
• Ability to research and locate technical information using equipment manuals, drawings, specifications, and other available resources.
• Ability to work effectively as part of a team while also completing assigned tasks independently.
• Willingness to learn industrial maintenance practices, mechanical systems, equipment reliability, and precision maintenance techniques.

Education & Experience

• Currently enrolled in a bachelor's degree program in Mechanical Engineering.
• Previous internship, mechanical, maintenance, manufacturing, or industrial experience is helpful but not required.
• Experience with computer-aided design software is preferred but not required.

Other Qualifications

• Knowledge of CAD/CAM is preferred but not required.
• Interest in industrial maintenance, equipment reliability, troubleshooting, and continuous improvement.
• Ability and willingness to perform fieldwork in an active industrial environment.
• Ability to wear required personal protective equipment (PPE) and work safely around industrial equipment.
• Ability to work collaboratively with maintenance crews, reliability personnel, engineers, operations personnel, and other plant team members.
• Commitment to following all Company safety policies, procedures, and applicable MSHA regulations.

Notice to Staffing Agencies

Capitol Aggregates Inc. (Capitol) will not accept unsolicited resumes from any source other than directly from a candidate. Any unsolicited resumes sent to Capitol, including unsolicited resumes sent to a Capitol mailing address or email address, directly to Capitol employees, or to Capitol's resume database will be considered Capitol property. Capitol will not pay a fee for any placement resulting from the receipt of an unsolicited resume. Capitol will consider any candidate for whom an Agency has submitted an unsolicited resume to have been referred by the Agency free of any charges or fees. Agencies must obtain advance written approval from Capitol's recruiting function to submit resumes, and then only in conjunction with a valid, fully executed contract for service and in response to a specific job opening. Capitol will not pay a fee to any Agency that does not have such an agreement in place. Agency agreements will only be valid if in writing and signed by Capitol's Human Resources Representative or their designee. No other Capitol employee is authorized to bind Capitol to any agreement regarding the placement of candidates by an Agency.

Position Information

Company : Zachry

Position : Engineer Intern

Req # : 11130997

Date Posted : September 17, 2026

Location : 11551 Nacogdoches Rd, San Antonio,
US,
TX,
78216

Job Category : Engineering