Pros
Development at scale. Sometimes you get a chance to work on new projects that millions of people will see. The pay is okay. Stock options (basically $100k in savings after staying for 4 years).
Cons
Each team is different, but I've heard everything you'll read in my review from every WDE I've spoken to at Amazon. The WDE position is a catch-all position for the lack of OE and process at Amazon and all the extra work and tedium that comes with it. You're expected to do SDE work, but you're also the goto "web technologies stack" developer, which means anything that someone else doesn't do is your job; and other people don't do a lot. The pay is not reflective of the struggle. 30-40% Dev time. Including architecture and planning. You are a secretary first, then admin, project manager, forecasting analyst, and finally a Dev. Their tooling sucks, really bad, and the teams that own said tooling are just as inefficient as everyone else, so everyone ends up in a whirlwind of inefficiency. As a web development engineer, you're expected to do much more project management work than SDE's, and almost as much development, but you get paid and respected significantly less. Product managers will attack you with feature requests daily, and you will usually be expected to finish those along with a multitude of other tasks; and the tooling and infrastructure cannot support such rapid feature development so you will get bugs and be stuck in a whirlwind of you and your teams edge-cases that cannot be tested for outside of prod When you do get a chance to do actual development: Days are either spent fighting the tooling(or lack thereof), or working on ugly code bases caused by unrealistic timelines for multiple ongoing projects with little care for your workload or lack of support structure. A population of new and inexperienced devs unfamiliar with technical debt and coding best practices is easily noticeable by looking at most packages' codebases. You will probably be lied to when you interview; I was. In the last year I have only written a few lines of JS, CSS, and HTML. This was not communicated appropriately in my interviews. Stock options are given out at a 5% after 1 year, 15% more after two years, then 20% every 6 months scale. This means that even though I was lied to in my interview and am mostly unhappy with my job, I had to stick it out for at least a few years for it to be worth it.