first some background. I'm an intern coming in on the end of my internship (tomorrow's my last day). I've been working on a reasonably important project, more specifically a restful API. We have automation set up so that any commits to master on GitHub are pushed out into a live, accessible version. Some guy (let's call him dumbass) joined our team last week, and has had a few ideas

Dumbass: *opens pull request to my repo*
My boss: *requests changes*
Me: *requests different changes*
(All this before even testing his code, mind you)
Dumbass: *makes requested changes*
Me: *approves changes*

A day passes

My boss: *approves changes*
Me (not even 10 seconds after my boss approved changes): *requests more changes*
(Still haven't tested his code, I just ran A PEP8 compliance test)
Dumbass: *MERGES CHANGES TO MASTER*

Literally EVERYTHING breaks because he was importing a module that's not available

We don't notice until later that day (I'm still working on writing the tests for the automation, for now changes get put on live version even if everything breaks -- tool is still in beta, so everyone working on it (a whole 3 people) knows to TEST THEIR SHIT BEFORE MERGING TO MASTER.)

WHY EVEN BOTHER WITH THE PULL REQUEST IF YOU WERE GOING TO MERGE TO MASTER YOURSELF ANYWAY??!??!??

My frustration cannot be properly conveyed through text, but let's just say this guy's been there a week, I already didn't like him, and then he fucking does this.