At TikTok, our application operates on a massive scale, serving billions of users with a complex and constantly evolving feature set. To manage this complexity, our engineering teams rely on a robust infrastructure and carefully chosen tools. One key technique we use is dependency injection (DI), which helps keep components loosely coupled and modular. As the app continued to grow in size and complexity, however, our existing DI system started to show limitations. In this post, we’ll...