Ask HN: Burning Out
Definitely talk to the founders. Founders probably have no idea you are considering leaving and would be shocked if you leave without voicing your concerns. Founders ALWAYS want to talk with key employees who are considering leaving. You are unlikely to get compensated with what you deserve, but they can definitely create a better working environment for you.  Even if things don't work out and you do leave, you'll walk out of things with a good reference and network from the founders because you left on good terms.