Can you act as our technical co founder substitute?

Partly. We can act as your fractional CTO and engineering team for the early stage: technical architecture decisions, engineering hiring advice when you are ready, code review for any in house engineers you hire, and senior level engagement on product decisions where engineering tradeoffs matter. What we cannot do is replace the co founder role of being equity aligned with the company outcome, raising rounds with you, or being in your cap table. For the engineering execution part, we are a working substitute; for the founder relationship, you still need a co founder if you want one.