Ask HN: How to be altruistic while working full-time?

I'm a full-time software developer at a company based in Boston, and most of the work that I do is backend (python/mongo/data) and is really tailored to the applications we're currently developing

I'd really like to contribute to open source projects but I feel like i never have the time to, or that If I were to contribute I would be spending less time doing work and more time focusing on the projects I'm contributing to. You would say that I should write better code and release code as packages or blueprints, but most of the code is proprietary, we're still validating our products, and if I were to do that I would have to spend a lot more time to add more functionality that really isn't used in my application, and iterations would generally take longer.

My question is this: how do you give yourself time to work on open source projects? do you feel like contributing to open source is better (in some sense) than contributing to the growth of your own company? or how do you make contributions/build open source projects as part of your job?