The code writing isn't the hard part per se, it's simply that I work for a startup and have a lot of work to do. My best design decisions and code and productiv

The code writing isn't the hard part per se, it's simply that I work for a startup and have a lot of work to do. My best design decisions and code and productivity come out of flow. I'm into functional languages like you are, but my background is in Lisp and Scheme where the cultural norm is to do bottom-up design and refactor/redesign as you go. If I feel trapped into my decisions, I've written poor code or made an uncommonly bad design.