Contribution-Based Firing of Developers?

There has been some recent clamor about the developer layoff and turnover policies enacted by high-profile corporate executives. Precisely defining the contributions in software development has always been a thorny issue, as it is difficult to establish a developer's "performance" without recurring to guesswork, due to how software development works and how Git persists history. Taking inspiration from a seemingly informal notion, the pony factor, we present an approach to identify the key developers in a software project. We present an analysis of 1,011 GitHub repositories, providing fact-based reflections on development contributions.