good low level backend stuff takes years of iteration under static business requirements. its also a well-understood domain with many prior implementations to l

good low level backend stuff takes years of iteration under static business requirements. its also a well-understood domain with many prior implementations to learn from, and the 'companies' tend to be product-based so you have much less customer pressure. teams reacting to changing or poorly-understood requirements (think enterprise and defense software contracts) have a much harder task. nobody has solved the problem before, nobody understands the problem, and project managagement is typically forced into waterfall in order to make sales, so its not like there's time to redo things that get duct-taped together, if the duct-tape holds.