Subsidiary: Sully Miller Holding Co.


Sully-Miller Contracting Co., the Colas USA subsidiary that operates throughout Southern California, is a company with nearly 100 years in the construction industry. Since 1923, Sully-Miller has become one of the premier construction contractors in Southern California, building much of the region’s infrastructure including airports, seaports, rail and intermodal, military/federal, roads, highways, and specialty projects. To learn more about Sully-Miller Contracting Co. visit  

Throughout Colas USA, we provide competitive pay, outstanding benefits, career advancement opportunities, professional education, and extensive training for every employee. We pride ourselves on upholding the highest standards of safety, environmental conservation, and ethical conduct as we strive to grow our infrastructure products and services through empowering and developing our people, fostering innovation, utilizing new technology, and maximizing vertical integration at all levels of the company’s value chain. To learn more about the Colas USA Family of Companies, please visit

Sully-Miller Contracting Co., and the rest of the Colas USA Family of Companies, is part of the Colas Group, the worldwide leader in transportation infrastructure construction and maintenance. For information on our international network visit


Job Summary


Interns will assist, shadow, and work with various members of the Sully-Miller Contracting Co. corporate team in order to gain experience in their chosen departments. Interns may be able to cycle between departments to diversify their experience. Interns will be exposed to day-to-day operations and will be able to gain hands-on experience with projects, reports, and other responsibilities. This internship will take place in Summer of 2023 from May to August. 

Main Responsibilities


Actual job description and duties will vary based interns' professional goals, availability, and department needs. Internships may be available with the following departments:

  • Accounting and Finance
  • Payroll
  • Human Resources
  • Communications
  • Administrative
  • IT
  • Safety

Internship availability will be determined by each department's needs. 

Education & Experience


To be considered for this position, you must be actively pursuing a two- or four-year degree. However, recent graduates are welcome to apply. Past work experience, no matter where, is always a plus! 


Please submit a resume and cover letter to be considered. Make sure to specify your preferred department in your cover letter! For those interested in a Project Engineer internship, please apply via our separate posting specific to that internship!

Colas Inc. and its subsidiaries are an Equal Opportunity Employer. For details on the specifics of this commitment, please click here to view the EEO document.  If you are an individual with a disability and require a reasonable accommodation to:

  • to meet the requirements of the role in which you are applying
  • complete any part of the application process
  • access or use the online application process and need an alternative method for applying

Please contact Colas Inc. at 973-290-9082 or send an email to

Nearest Major Market: Orange County
Nearest Secondary Market: Los Angeles