Frequently asked


What is Call for Code?

Call for Code is a global program that invites developers and problem solvers around the world to build and contribute to sustainable open source technology projects that address social and humanitarian issues, while ensuring the top solutions are deployed to make a demonstrable difference.

Call for Code has grown into an always-on, tech-for-good platform with many ways to get involved, including participation in the annual Global Challenge, collaboration on open source projects including Call for Code for Racial Justice, or being inspired to further develop your technical skills. 

Where can I learn more about previous Call for Code winners?

Visit for more information about previous Call for Code winners and their solutions.

Global Challenge

What is the 2023 Call for Code Global Challenge?

Each year the Call for Code Global Challenge inspires developers and problem solvers to identify technical solutions to societal and humanitarian problems related to a particular theme and build a solution, with the goal of deploying the solution to make a demonstrable difference.  

The 2023 Global Challenge theme is Sustainability. Learn more about the 2023 Call for Code Global Challenge, including prizes, deadlines, and rules to participate.

How did we determine the 2023 Call for Code Challenge theme?

Sustainability is a top priority for communities and companies around the world. But innovative solutions are needed to meet the sustainable development goals set forth by the United Nations. To do the most good, sustainability solutions should have global potential, but they also need to benefit local communities, especially marginalized communities that are most often polluted or left out of policymaking. Technology is key, as open innovation can address sustainability challenges effectively and at scale.

What is the maximum team size?

Teams should have a minimum of 1 and a maximum of 5 members.