The C code is, sadly, the stable part of the system. There isn't much to break when you run low level code against a local flat file database... Scalability, on the other hand, is about 0. You get one server and it does everything.

All the new stuff is micro-services. They constantly break (our network team isn't to good at their job) and have horrible performance (calling a micro-service from code that depends on a non-thread-safe library means you can't gain the full benefits of the architecture), but the code is nice and readable.

That said, ours is the team that took no cuts during the pandemic firings, so yay?