Please don't think that the software in itself has any value (unless it is an extreme outlier). Most software/saas value comes from grueling marketing and sale

Please don't think that the software in itself has any value (unless it is an extreme outlier). Most software/saas value comes from grueling marketing and sales work after it is "ready". Ask yourself. Can you drive the sales process yourself, potentially earning zero for a year? Do you want your day to be a on-phone sales person? I think it comes down to the old saying "a bird in the hand..". Unless you LIKE doing endless phone followups and negotiations with customers, my advice would to strongly consider the offer, especially if you like your potential new employer. 90ish grand is not unicorn land, but definitely not pocket money either - and from two years of sidejob I am impressed (as a company owner for more than a decade and a half). As you write it, it seems like 4% of the company not for percent of the sales. That might be much more (or less) value. Being employed in a good company with a noticable equity share could do wonders for your work-life balance (but is not guaranteed). As a last point. Being rich does not make you happy. Having slightly more than enough* and more freedom will likely make you much more happy. * = Enough is hard to quantify but if you never think about money in your daily life, but you cannot buy a new iphone (or something of similar value) without thinking slightly is my rule-of-thumb for "enough". EDIT: missing "and" and typos