[raphaelj]

Ask your employer to work Part-Time (e.g. 3 or 4d/w).

That will free a lot of time to prototype and experiment with your SaaS, while keeping a stable income stream. You'll basically an infinite runway to launch your product.

CV-wise, that's even better as the experience you'll get on your side-business (product dev, project management, new techs ...) will add up nicely to your regular job's. There will be no empty line on your CV.

I've been doing this for 4y, taking free time, learning new techs and and trying to launch various SaaS, and my CV would never been as great if I kept working full-time. I'm also significantly happier.