You talk as if the customer already has the quiz content in their mind, and just needs a few web pages to present it.
That's not the way the industry works.
Some exciting, specialised startup develops some kind of cool UI blended with some psych validated content, and manages to get it installed at a couple of large reference clients, and then finally manages to draw a link between the quiz results that candidates achieve, and their ultimate chances of successful employment (maybe just getting hired - maybe their on the job performance after X months).
The customer is buying into this package of leading edge stuff. They don't want their existing vendor to have some junior developer hack something up and put it behind a feature flag. They want the new shiny stuff, and they want it from the new shiny vendor.
