Summer 2026 Software Engineering Internship

T-Mobile•Philadelphia, PA

1d•$26 - $47•Onsite

About The Position

T-Mobile is synonymous with innovation–and you could be part of the team that disrupted an entire industry! We reinvented customer service, brought real 5G to the nation, and now we’re shaping the future of technology in wireless and beyond. Our work is as exciting as it is rewarding, so consider the career opportunity below as your invitation to grow with us, make big things happen with us, above all, #BEYOU with us. Together, we won’t stop! Get hands-on experience, training—and a leg up on a bright future. Learn. Achieve. Build a career. T-Mobile is revolutionizing the wireless industry for millions of customers nationwide. Working here means rolling up your sleeves and redefining the status quo with a team that has your back every step of the way! This is an 11-week paid learning experience during which you’ll be able to connect and network with other interns and leaders within the company. We invite you to come innovate with mentors who will challenge you to develop meaningful skills. You’ll contribute your creativity and outstanding ideas, while working alongside T-Mobile employees. We’ll give you hands-on projects and the chance to create an immediate impact. What It’s Like At T-Mobile Advertising Solutions, powered by Vistar Media, you’ll be immersed in the fast-moving world of advertising technology. This summer internship offers hands-on experience building real platform solutions that power innovative media experiences. You’ll collaborate with engineers, product managers, and cross-functional partners while gaining exposure to how large-scale ad tech platforms are designed and built. You’ll be supported by experienced mentors, included as a true member of the Engineering team, and encouraged to explore new technologies in a collaborative, Agile environment—all while being part of T-Mobile’s Un-carrier culture.

Requirements

Rising Sophomore, Junior, or Senior pursuing a degree in Computer Science, Computer Engineering, or a related field
Proficiency in at least one programming language: Python or TypeScript
Familiarity with core programming concepts and the software development lifecycle
Strong problem-solving skills and ability to adapt in a fast-paced environment
Passion for innovation, learning new technologies, and hands-on development
Ability to work on-site in the Philadelphia office at least three days per week
At least 18 years of age
Legally authorized to work in the United States
Must be actively enrolled in a Bachelors or Graduate degree program
Employees of T-Mobile or Metro by T-Mobile are ineligible for Internships
Employer does not sponsor work visas for this position. Note that this also applies to individuals who are students in F-1 status who desire sponsorship after they complete their education.

Nice To Haves

Experience building open-source projects or GitHub repositories is a strong plus
Previous internship or work experience in an engineering role is preferred but not required

Responsibilities

Assist the Engineering team with day-to-day development work
Collaborate cross-functionally with Product and other teams
Participate in daily stand-ups and share meaningful progress updates
Contribute to an internal-facing engineering project from concept through completion
Write, test, and improve code using Python and/or TypeScript
Participate in the code review process to ensure quality, performance, and maintainability
Learn about the advertising technology ecosystem and modern software engineering practices
Develop features and enhancements under the guidance of senior engineers
Debug issues and help improve existing systems and workflows
Apply programming fundamentals and software development lifecycle concepts
Use Git and version control best practices to collaborate on code
Communicate effectively with teammates in a fast-paced Agile environment
Take ownership of assigned tasks while learning to work independently