The bricks are pretty standardized? I mean, you're not reinventing singly-linked and doubly-linked lists from first principles no? When I program I think in terms of data structures, data hierarchy, and algorithms. I want to use a queue here, a lock here, a double linked list there, an array list over here, maybe a hash dictionary with linked-list chaining for collisions. It's only a few times in my career that I built a bespoke data structure from the ground up and they were all for very hot loops and one case involved working on a lock-free algorithm.

I've done a lot of functional coding in the past (in academia, in Haskell as a hobby, and Scala for a unicorn where I was an early hire.) This probably affects how I think. But I find it quite natural to organize my code this way. After all the fundamental data structures and the hierarchies relating them are what often determine core properties of your programs such as being CPU, Memory, or IO bound.

I also work as a pretty senior engineer and my tasks before agents were usually about leading a team to implement something. I would often do the v0 implementation to make sure we met customer requirements and then take a step back and help the team scale the service up. These days the team is a lot smaller and maybe just another engineer; the agents make up the rest.