I think you’re defining “meaningful” too narrowly as “the business does something meaningful/important (to you)”, it may well do that but suck your soul out doi

I think you’re defining “meaningful” too narrowly as “the business does something meaningful/important (to you)”, it may well do that but suck your soul out doing it, or harm people/things in the process, SpaceX might be a good example of that, or Theranos. The inverse of what you say you’re looking for is finding meaning in a job at an uninteresting company, there are still interesting people and interesting sub-problems at otherwise uninteresting places.