"I wanted to make sure that my first job post-university would be somewhere where I would feel happy and work not on my own, but with an agile team ..." It's interesting that any young developer would regard the micromanagement that comes with agile as a plus.
He worked at a waterfall digital agency. Literally anything is better than that. The description of working a digital agency matches mine exactly. Your given pictures and told to make it work as fast as possible. With no input into the actual experience.
> "Your given pictures and told to make it work as fast as possible. With no input into the actual experience."
That's not what waterfall is. That's almost the exact opposite of what waterfall is. The general idea behind waterfall is that you do most of the UX design planning before a developer gets to work on it. If you're "given pictures and told to make it work as fast as possible" that is not waterfall.
Look at the graph found in this Wikipedia page, and note how the 'Requirements' and 'Design' stages are either started or completed before 'Implementation' commences: