> (as others pointed out, check your employment contract's IP clause and the IP laws of your country). This is the most critical part. Using the US for example

> (as others pointed out, check your employment contract's IP clause and the IP laws of your country). This is the most critical part. Using the US for example, this software whether OP reveals or not belongs to the company (even in California). The reason is it uses the same data, the same processes, and likely even the same language. Therefore, it is "in the line company business" and most judges would rule in favor of the company despite it possibly being written on OPs own hardware. Best advice is to just delete it, or come up with a thoughtful way of bringing it up as this comment suggests. As it stands now it's likely that OP is in hot water legally otherwise. good middle ground is to take what you've written and draft it into a proposal, never mention the code you've written, and get paid to rewrite it better. Worst case you tell them, and then the company gets their IP lawyers involved and things get dramatically worse.