Question: After graduating from university in the UK, I have heard multiple careers advisors say that it is inadvisable to leave your first career role before you have gained at least two years experience.

However I feel my current role is currently holding back my career progress as I am unable to properly learn industry standard technologies, and is affecting my health due to unbearable amount of stress caused by poor management.

I have worked nearly a year and a half at this company but it is still my first career job. Will this look bad to future employers? I work in a sector that currently has lots of job opportunities.

Answer: 
Some context: I'm building out a software development team right now, and I've rejected almost every candidate thus far. I've spent my entire career in the US.

I think it depends on the nature of the transition. If you go from "Software Engineer" to "Software Engineer" at a different company in a short span of time, that would raise the possibility of "job hopping" to me and I would ask about it. It wouldn't be an immediate disqualification in my mind, and a well-considered explanation would make me think no more of it. Some jobs just don't work out. Some jobs will use really underhanded tactics to get you on board, and then abuse you or just provide terrible work/environment.

However, if you're taking an obvious step up then I would completely ignore the short period of time at the prior job. My first job was a miserable one at a biotech startup, where I had a position much below my qualifications. I left that job less than a year later for a much more technical and satisfying job. It didn't cause any problems then, and to my knowledge it hasn't caused me any difficulties in finding new employment.
Don't worry about it. If you receive an attractive offer take it. Lots of people are unhappy in their first job. But be careful not to just jump from one position to the next one that is slightly more attractive. Think about what you want and try to find a position that matches.