People. Unfortunately, I have to say it is definitely people-but possibly less professionally of me I have to say specifically one person. Who, due to situation

People. Unfortunately, I have to say it is definitely people-but possibly less professionally of me I have to say specifically one person. Who, due to situations that had the outcome of our engineering organization no longer having a manager-has aggressively usurped a 'leadership' role-purely due to seniority-and has displayed a shocking unwillingness to entertain ideas that do not originate from him. It hasn't been without it's own outcomes. Like multiple engineers leaving and refusing to work with him any longer, and those who remain saying quite frankly in back channels how the feel about this individual. More disastrously, though, his behavior has resulted in multiple client facing outage. So yeah, people. Which is the shame because I love dearly everyone else I work with. My resignation is already typed up.