BOTEC means back-of-the-envelope calculation. This can take the form of a few rows in a spreadsheet where someone estimates their counterfactual lives saved / donations induced / welfare improved from a set of choices (ex. doing direct work instead of earning to give).
I have heard of people using these to inform career choices but haven’t seen too many in the wild (even anonymously).
There's some of that in these posts:
https://lynettebye.com/blog/2024/5/2/how-to-make-hard-decisions-and-have-impact
https://lynettebye.com/blog/2024/7/29/my-career-exploration-tools-for-building-confidence
Though it's more focussed on generating ideas and testing them