Amazon engineering culture and former employees have permeated this company. Every warning I'm sure you've heard as an engineer about what Amazon's culture is like and how it results in burnout is becoming a reality at Acorns.
The product team is full of passionate people but they are reactive, not proactive, and pushed around by business execs and design. Many times product duties fall to the engineers, so you're responsible for both writing tickets and acceptance criteria AND the code to make that happen. Also depending on your team you may be responsible for QA.
Constantly management will pull QA and devs from teams to throw them at the latest new thing that needs to be out by some arbitrary deadline. Literally the main thing that The Mythical Man-Month warns about is SOP at Acorns. And worse, the poor soul who got "borrowed" still is expected to juggle duties at their original team, leaving them overworked or teams in limbo because they're down a person.
Glassdoor won't let me link to it but google "An Amazon Programmer's Perspective" (with quotes). The "Then Come Loaners" section was entirely eery to read as it perfectly describes Acorns.