I advise you to check with your human resources department that you are contractually allowed to undertake your business on the side. If they give you the go ah

I advise you to check with your human resources department that you are contractually allowed to undertake your business on the side. If they give you the go ahead then get it in writing, and then make sure that you NEVER use their time or resources for your business. You will be watched, especially by big corp. You have no privacy when you work for large companies and use their network. If your project uses any technology that in any way resembles that of your employer, then you are running the risk of being fired or sued, or both. I ran into this issue. I sent a private email on their time and using my work PC and my personal email server. Also, I did not explicitly declare my company directorship. My lesson was learnt very quickly. In hindsight, I would save up to give myself some runway and then quit my job before starting my project. Focus, focus, focus.