Contribution graph
The grid of green squares on a GitHub profile. Each square is one day, and darker means more public activity that day.
What it tells you about a developer
Read the graph as a pointer to the days worth opening rather than as a score. A steady band of weekend and evening activity points to projects nobody paid for, which is where genuine interest shows.
The contribution graph counts a developer’s public commits, pull requests, and issues, one square per day for the past year. Private work can be counted if the developer switches it on, and most leave it off. A full graph shows public activity and says nothing about the size or quality of it, and the pattern is easy to run up on purpose. An empty graph can sit under a year of private work at a company.