I am joining a company full-time next week and I am also working on my own start-up idea in parallel with few people.
There is some related and closed discussion here on this but all the answers are about company specific contract and region specific laws.
However, my question is assuming it is clear from legal and contract perspective (which most likely will be the case but I will make sure), when is the right time and how to tell my soon-to-be employer (or just employer for that matter), that I am planning/working on my own start-up as well. Irrespective of what is in contract, I want to do what is professionally correct thing to do.
Also, nothing I build in my start-up will compete with this company and I can make sure I do not use their time/facility/softwares to do anything for my company.
To give more context to this, this company I am joining is itself a small 5-year old company with very informal and friendly attitude. I am already well connected to the team and the founding members and have regular discussions with them. So I just feel that I should probably tell them now or as soon as I join. Since the culture is mostly friendly, it would be very weird if I suddenly tell after few years that I have been working on my own company for this long. But I also think that may be I should see if the start-up idea is working out at all or not.