What Are Your Biggest Challenges When Onboarding to a New Codebase?

Setting up the environment is a huge headache! It’s wild that not every team has a standard onboarding protocol. New developers often feel like they’re on their own having to figure out what tools to install or avoid. It can feel like a test sometimes, watching new hires struggle with things like proxy settings. It’s so much easier when teams help new developers feel welcomed and allow them to contribute from the start!

Understanding the business logic is often where I get stuck. Each system has its quirks and figuring out the data flow can be quite the puzzle.

Building the mental model of the system is where I spend most of my time. You need to know how data flows, what interacts with what, and identify all the entry points. Setting up the environment can be a hassle too, but once you’re in, understanding the system is a bigger time commitment. One thing that didn't help was trying to read random code files without any context; instead, I found it beneficial to start with one feature and trace it from request to response. Good documentation also makes a huge difference—bad docs can really slow you down!

Undocumented business requirements can really mess things up, especially those older ones that no one seems to remember. It’s even worse when they weren't included in source control; those are the sneaky landmines that take forever to figure out!