I want to bring on 2 developers as junior partners/cofounders (I already have one). What percent of ownership is typically offered in this scenario?

Our initial product will be a B2B, 3rd party, Enterprise SaaS app. We need back door access, so we cannot develop the app without business partners being on board. So there will not be much development work until then. We have a strong business case and we are in the draft business planning stage. Our initial product will be global - with no competition. We are projecting an annual revenue in the low billions. We met with a seed funding venture capital group who loved our idea. We just need to finish our market analysis and get a little more traction before we come back for seed funding.