What is my experience about job and trading together is failure in my life. If we want to do trading for sure we have to give our maximum time to watch it closely which is not possible when we have job. While we are working it is very difficult to give time to watch the trading due to our work load and the pressure of our work not let us to look into the market sentiments and trading level which lead us to panic ourselves and take the wrong decision on it so it is not advisable to have trading and job together.
If you are talking about day trading then it is really difficult to continue both your day trading and job, you must choose one of them, because no one can continue both of them in same time. but i think if we talk about online trading specially crypto trading then we can even continue it with a day job. Because online trading do not require such a big time but can do it very easily even after day job. i Mostly give time to crypto trading in evening.