Most jobs especially in webdev are like that. Most of it is just reheated slop, if the market was efficient the webdev market would shrink by 75%. I've done novel stuff but most of my jobs end up just pushing a star shape through a square and a triangle whilst making sure the whole legacy spaceship keeps floating.

There are truely novel webdev jobs out there, but they are a needle in a haystack. If you want something that mentally stimulates you as an developer find a job that doesnt involve web for higher chance of finding something that fits the bill.