Engineering Intern

RLS LLC

As a part of the global industrial organization Marmon Holdings—which is backed by Berkshire Hathaway—you’ll be doing things that matter, leading at every level, and winning a better way. We’re committed to making a positive impact on the world, providing you with diverse learning and working opportunities, and fostering a culture where everyone’s empowered to be their best.

Engineering Intern

Hazelwood, MO (on-site)

A Summer Experience. A Lifetime Of Value.

We’ll meet you where you are and help you go further.

This summer, we’re committed to bringing early‑in‑career talent together, trusting you to own your work and help you level up through professional development, networking, and exposure to real‑world projects.

We’re doing things that matter.

Join us as an intern and we’ll help you move up and around Marmon’s 120+ companies as you grow your skills.

Join the Biggest Small Business You’ll Ever Find.

As part of Marmon, you get the best of both worlds. The strength and stability that comes with being part of Berkshire Hathaway, plus the autonomy and opportunity that comes with working at one of our 120+ companies.

Rapid Locking System (RLS) is a leading global manufacturing company with a strong commitment to innovation, efficiency, and sustainability. With a dynamic presence across multiple continents, we specialize in manufacturing press‑to‑connect technology for HVAC/R and are at the forefront of adopting lean practices, automation technologies, and 5S principles to ensure operational excellence.

• Our Engineering internship offers hands‑on learning experience in product design, testing, quality, and manufacturing.
• As an intern, you’ll work closely with a Senior Engineer and the Engineering & Quality team, assisting with various projects such as warranty/root cause analysis, process control analytics and implementation, new product testing, and more.
• You’ll also gain experience in hydrostatic burst testing, grain analysis, and other product evaluation methods. Present project reports to senior leadership, helping to develop critical communication skills and abilities.
• This internship provides valuable, real‑world skills and a deeper understanding of the engineering processes behind critical electrical systems.

• Pursuing an undergraduate or graduate degree in Engineering, preferably in Manufacturing, Process, Mechanical, or Industrial Engineering.
• Rising Junior or Senior
• The ability to demonstrate relevant skills and experience required for the role
• Excellent written, verbal communication and presentation skills
• Ability to effectively communicate issues and solutions to all levels of the team
• Strong analytical and problem‑solving skills
• Cross collaboration skills
• Proficiency in Microsoft Office (Excel, Word, PowerPoint, Outlook, and Teams)

• The internship will run for approximately 12 weeks beginning in late May through August.
• Temporary Part/Full Time, targeting 40 hours per week.
• Exact start and end dates are flexible based on school schedules and the needs of the business.
• This is a paid internship.

This position is based in our state‑of‑the‑art manufacturing facility and involves working in a manufacturing environment/general exposure to a manufacturing environment. The environment may involve exposure to noise, temperature fluctuations, or other factors. Employees are required to abide by PPE guidelines when onsite.

• Successful completion of a drug screening and a physical exam are required for this role.
• This position involves regular walking, standing, sitting for extended periods of time, hearing, and talking.
• May occasionally involve stooping, kneeling, or crouching.
• May involve close vision, color vision, depth perception, focus adjustment, and viewing a computer monitor for extended periods of time.
• Involves manual dexterity for using keyboard, mouse, and other office equipment.
• May involve moving or lifting items up to 50 pounds.
• Ability to work in a manufacturing setting.

Following receipt of a conditional offer of employment, candidates will be required to complete additional job‑related screening processes as permitted or required by applicable law.

We are an equal opportunity employer, and all applicants will be considered for employment without attention to their membership in any protected class. If you require any reasonable accommodation to complete your application or any part of the recruiting process, please email your request to , and please be sure to include the title and the location of the position for which you are applying.