3TSI is a growing business, and throughout our growth and expansion we are looking for qualified applicants to fill our current job openings. Not only is 3TSI a great place to build your career, but we also offer opportunity for advancement, above average wages, and an industry-leading benefit package. We work diligently to recruit, and train the best in the business, and we value those who share our "do whatever it takes to make the customer happy" attitude.

If you are interested in a career with 3TSI, have a strong work ethic, and enjoy a fast-paced, friendly environment, then we encourage you to review our current job openings, and apply online, or in person at our Sioux City location.

    Available Positions

  • Boiler Service TechnicianFull-time

    About this Position
    Perform service work and installation work of Industrial and Commercial boilers, burners, pumps, water treatment and controls equipment.


    • Sound electrical background
    • Strong customer service skills
    • Basic knowledge of piping installation and repair
    • Basic boiler and boiler component knowledge
    • Good oral communication skills
    • Must be able to work overtime, weekends and travel
    Learn MoreApply Now
  • Code WelderFull-time

    About this Position
    Info about code welders.


    • Must be able to pass a section IX approved weld test which will be in the 6G position and X-rayed. Must be able to work overtime, weekends and travel.
    Learn MoreApply Now
  • Sanitary WeldersFull-time

    About this Position
    Info about sanitary welders.


    • Must be able to purge weld food grade sanitary steel tube. Must be able to work overtime, weekends and travel.
    Learn MoreApply Now


Our employees are the key to our success, and we pride ourselves on being able to offer some of the best benefits in the industry.

Our health coverage provides you with access to many of Siouxland's doctors, dentists, and optometrists; not only for you, but your family, as well.

    Health benefits offered:
  • Medical Insurance
  • Dental Insurance
  • Vision Insurance
  • Aflac Supplemental Insurance (Learn more)

In today's economy, your personal well-being is important, and we want to help you reach your goals.

    Other benefits include:
  • Progressive Pay Program
  • Vacation, national holidays and paid sick time
  • 401K
  • Profit Sharing
  • On-the-Job Training
  • Career Progression