Mobile Developer Intern
San Francisco +1
Posted 3 months ago

Company Description

Square builds common business tools in unconventional ways so more people can start, run, and grow their businesses. When Square started, it was difficult and expensive (or just plain impossible) for some businesses to take credit cards. Square made credit card payments possible for all by turning a mobile phone into a credit card reader. Since then Square has been building an entire business toolkit of both hardware and software products including Square Capital, Square Terminal, Square Payroll, and more. We’re working to find new and better ways to help businesses succeed on their own terms—and we’re looking for people like you to help shape tomorrow at Square.

Job Description

Our developers keep Square simple and make our users faster and smarter by giving them a designed payments experience and rich data surrounding each transaction. We're looking for engineers of all shapes and sizes, who are excited about building outstanding software and solving hard problems. Our challenges span many technologies, from web and mobile applications (iOS, Android) to server-side development (Java, Ruby). As an engineer at Square, you will work on a small team with people across engineering, product, and creative, building reliable, fast, responsive, and beautiful software.

You Will Build And Impact

  • Reliability: Ensure Square works right, every time, by using testing, continuous integration, and in-depth code reviews
  • Security: Create interactions and APIs that promote trust, increase security, and make it harder to do the wrong thing
  • Analytics: Collect all the data around every transaction and turn it into tools that help our users
  • Products: Envision entire new products, features, and flows that are inspired, considered, and magical
  • Fraud Prevention: Make quick decisions on millions of dollars which requires diligence and passion for detecting bad actors and preventing loss


  • Available to work during Fall internship or co-op term (12 or 16 weeks), starting in September 2021
  • Pursuing degree in Computer Science, Electrical Engineering, Math or related technical field, graduating between May 2022 and May 2023. Recent bootcamp graduates and engineering training participants are also considered within three months of completing program or training requirements
  • Programming experience in one or more object-oriented languages, including: Java, Kotlin, and Swift
  • Square internships are 12-weeks and co-op placements are 16 weeks

Technologies We Use And Teach

  • Java, Python, Ruby, Go, Kotlin, Swift, & C
Square is a merchant services aggregator and mobile payment company that aims to simplify commerce through technology.
Size:  1001-5000 employees
Funding Level:  Public
Symbol:  SQ
Year Founded:  2009
Sequoia Capital
Khosla Ventures
First Round Capital
GGV Capital
Kleiner Perkins
Sapphire Ventures
Goldman Sachs
SV Angel
Morgan Stanley
Starbucks Corporation