What is it that you hate about the job? A lot of times, I find that hating your job is really a symptom of something deeper. I think this might be true for you

What is it that you hate about the job? A lot of times, I find that hating your job is really a symptom of something deeper. I think this might be true for you because you also mentioned that you wouldn't be satisfied working for Google. You have a PhD, maybe you're yearning to return to a research oriented career in academia? I honestly recommend seeking therapy before quitting. It might highlight something deeper that might help guide you. Even if you do end up quitting, at least it will guide you towards the right path. Also, remember that even having these types of thoughts means we are in a relative place of tremendous privilege where our basic needs are met and secured. Many in the world don't have that privilege. That's not meant to guilt you, but to help you put things in perspective. Usually when we are materially satisfied, we start to seek higher levels of meaning and since we spend so much of our waking time working, we try to seek satisfaction through work. But the world doesn't value our individual satisfaction. Finally you seem to have some conflicting goals (or maybe not). If you want to retire early and stay with your partner, it might mean making the sacrifice of living in London and also working in a high paying job where you are disconnected from the value it brings to society. You can potentially speed up this process by working on building a high value company, but working in quant finance you should be able to assess risk-adjusted returns and determine if that path is feasible or makes sense in your individual circumstances.