Ask HN: How much ownership is reasonable for a technical co-founder?

Any feedback would be greatly appreciated, Thanks!

Why do you need the business types to be co-founders? Why do they get shares at all? Why not hire them as employees (or temporary contractors)? Is your prototype done? If not, why do you need business-types now? What value do they add?

You should retain majority if not 100% of the shares. That way you have more shares left in the pool with which to recruit engineers.

If it's 3 people contributing 100% of their time to the project then it should be 33% for each. If you don't think they will contribute enough to the project for their 33% then perhaps you should be looking for other founders/partners.