I'm working on a startup based on my partner's idea. It's a social website.
My partner is not not a technical guy but the one with the original idea, he had previous experience with a successful startup. He manages the business part and is basically the "product owner".
I'm the main (and currently the only) developer in the project.
Originally we splitted the shares 60/40 (40 for me).
I worked on this on my free time all last year (around 20 hrs a week), at the end of last year we had an alpha version that we used to get some angel funding. I've been working full time all this year (by full time I mean 80hrs a week).
Now we are thinking on bringing a designer on board (previously we had some friend helping us with the UX experience and a freelancer doing the logo and stuff like that).
We've seen that this designer we want to bring on board is very good and he can definitely help us in the future (mobile version of the site, etc), and he's also very excited with our product/ideas and wants to join.
The idea is to bring him for shares only, but he'll work only on his free time (15hrs a week). At least until we get our initial "professional" round of financing.
Right now different investors/advisors have around 15% of the company (our 60/40 got diluted), and we were wondering how much would be a fair percentage to give the designer.
I was thinking that something like a 10% is a good number, however my partner thinks that's not enough. Whatever percentage we give him would be made available to him when we reach specific objectives (e.g. site redesign, mobile design, first 1000 active users, first round of financing).
What are your thoughts? Thanks a lot for the advice.