Shipping the frontend for features in a core product area on a large team, just like a lot of other devs here :)
To go into specifics of actual problems solved and do so intelligibly, I'd have to provide specific context, which I'm not comfortable doing here.
It's a lot easier to describe "interesting problems solved" using less identifiable (and more generally interesting) details if one is in platform/infra and/or operating at a Staff+ level -- both of which I have been in the past (and loved it), but am not at the moment.
I'm pretty sure no one is going to be hunting down NDA infractions on HN unless the poster is silly enough to give specifics about the workplace and time at which they solved the problem. If it takes some kind of investigative work to piece together the most basic details, I think that's within the terms of most NDAs anyway.
One of the last times I commented in a thread like this, someone looked at my profile (which has my real name), found me on LinkedIn, and then posted my employer's name in a reply to me, calling out an alleged conflict of interest (you can find it in my comment history and make a decision on that for yourself, if you're curious).
It's not worth the internet points for any of us to post details beyond what we do.
