I have been inspired today to make a wallpaper to better explain my code

In cour company we need an online dashboard that monitors logfiles from various interface processes.

My collage and me, the newest company members (for almost 2 years) get the task to build this and get it presented as some intern project where we can try out some more recent technologies/frameworks.
Now in the first meeting our senior team leader told us we shoeldn't use the noew hot buzzword js frameworks.
Reason? They are not proven and wil probably lose popularity next year and we don't want to migrate everything every half year. Plus he had negeative experiences with Angular in some project he had to work on, probably just because his limited JS skils.
So he wants us to use jQuery to build a modern web application.

I get it you don't want to migrate to TheNewHotThing(tm) every year. Guess what? You fucking don't have to. If I build sonting in Vue.js now, it won't stop working when a new framework comes along.
Look at our own fucking ASP.NET Web Forms prooject, that stil works. Just don't deny the usability of modern frameworks.

Long story ahead

Background:
I recently started a job in a smallish startup doing web development in a mostly js stack as an entry-junior engineer/dev. I’m the only person actively working on our internal tools as my Lead Engineer (the only other in house dev) is working on other stuff.

Now I was given a two week sprint to rebuild a portion of our legacy internal app from angular 1.2 with material-ui looking components with no psd’s or cut-outs of any kind to a React and bootstrap ui for the front end and convert our .net API routes into Node.js ones. I had to build the API routes, SQL queries (as there were plenty of changes and reiterations that I had to go through to get the exact data I needed to display), and front end. I worked from 9am until 11pm every day for those two weeks including weekends as our company has a huge show this upcoming week.

I finish up this past sunday and push to our staging environment. The UI is 5.5/10 as we’re changing all of our styling to bootstrap and I’m no ui expert. The api has tests and works flawlessly (tm).

So we go into code review and everything is working as expected until one tab that I made erred out and was written down as a “Needs to be fixed.”

This fix was just a null value handler that took three minutes and a push back to staging, but that wasnt before a stupendous amount of shit being flung my way for the ui not looking great and that one bug was a huge deal and that he couldnt believe it slipped through my fingers.

Honestly, I’m feeling really unmotivated to do anything else. I overworked myself for that only to be shit on for one mistake and my ui being lack-luster with no guides.

Am I being a baby about this or is this something to learn from?

Genuinely asking some rare pokemon php developers that are up to date with the tech (all php devs I know stopped learning when my grandpa was like 5 years old) to show me php code that is not spaghetti bolognese. I am asking this as I am yet to witness such code for the first time in my life (and I am coding since 94')!