Software Engineer

What You'll Do

Are you ready to take on the challenges of supporting our national security and helping to transform critical Mission Applications software applications to meet our mission goals? This internship offers a unique work experience and engaging assignments.

We are currently recruiting for Summer 2026 internship opportunities in the field of computer science. The Internship Program is a 10-12 week program that offers challenging assignments, projects, and career development workshops to enhance your professional growth. You will also earn a competitive salary based on your discipline and academic class status.

Some of your tasks may include researching, designing, developing, and modifying mobile applications, enterprise-wide systems and other applications software using languages and infrastructures such as .Net, C#, C++, Java, JavaScript, JQuery, ReactJS, NodeJS, SAPUI5, ABAP, and HTML5.

The 2026 intern program is scheduled to start on May 18, 2026 and conclude on July 23, 2026.

What You Can Expect

• Meaningful work and unique opportunities to support missions vital to national and global security
• Top-notch, dedicated colleagues
• Generous pay and benefits with a stable organization
• Career advancement and professional development programs
• Work-life balance fostered through flexible work options and wellness initiatives

Minimum Job Requirements

• To be considered for the Intern position, you must be working toward or have completed a degree in computer science or information technology. Students who have graduated are eligible up to two years post-graduation. In addition, you must have completed (at a minimum) your sophomore year in college, have an overall GPA (grade point average) of 2.8/4.0 or above, and be a United States Citizen.
• A completed online application is required. You must include a resume and current transcript. Ensure that your graduation date and GPA are listed on your resume. Failure to attach a resume and transcript will eliminate you from the selection process.

Why Y-12?

You get #morethanajob. We encourage employees to achieve a healthy personal balance among home, work and the community. One of the ways we embrace work-life balance is by offering flexible work arrangements that provide alternatives to the traditional workweek, while still meeting business needs. Top talent and personal commitment mean more to our success than any other factors, so we reward our people with the kinds of benefits that make a positive difference in the quality of their lives. Benefits such as: medical plan, prescription drug plan, vision plan, dental plan, employer matched 401(k) savings plan, disability coverage, education reimbursement and many more. Want to stay healthy and fit but hate the cost of a gym membership? Take advantage of one of our onsite workout facilities and eat healthy in our onsite cafeterias. Much more than a workplace, at Y-12, you can build a career that lasts a lifetime.

Notes

The minimum education and experience for the lowest career level in the job posting range are listed under Minimum Job Requirements. Successful candidates hired into a higher career level than the minimum in the range must meet the requirements listed in the job leveling charts for the career level into which they are being hired.

If a range of Career Levels is posted, i.e., Senior Associate to Senior Specialist, internal applicants already in one of the Career Levels would come across at their current Career Level. Internal applicants currently in a lower level Career Level would move to the lowest posted Career Level.

Requires a Q clearance; however all qualified candidates will be considered regardless of their current clearance status. The ability to obtain and maintain a Department of Energy Q clearance is required.

This position may require entry into the Material Access Areas (MAA) and participation in the Human Reliability Program (10 C.F.R. Part 712), which requires successful competition of a DOE counterintelligence evaluation and may include a counterintelligence-scope polygraph examination.

This position may be categorized as a “designated position” identified by 10 C.F.R. Part 709, requiring successful completion of a DOE counterintelligence evaluation that may include a counterintelligence-scope polygraph examination.

CNS is a drug-free workplace. Candidates accepting a job offer will be required to pass a pre-placement physical, drug screening and background investigation. As an employee, you may be required to receive and maintain a security clearance from the United States Department of Energy in order to meet eligibility requirements for access to sensitive information or matter. U.S. citizenship is a requirement for security clearance applicants. All employees are subject to being randomly selected for drug testing without advance notification.

CNS is an equal opportunity employer. All qualified applicants will receive consideration for employment based on merit and without regard to race, color, religion, sex, sexual orientation, national origin, protected veteran status or disability.