Hi,
I've read your brief and can see that you'd like to build a market place for infant/mom/maternity goods in spanish.
I am extremely experienced in iOS and Android app development with 10 years and I am also very strong at server back-end programming, as well as synchronizing app and MySQL database by developing and integrating JSON-RESTful server API modules.
If you'd like to take a look at my previous works, please check my freelancer profile.
https://www.freelancer.com/u/aashshak
Based on analysis of requirement and from my experience, I offer $8000 / 60 days.
Milestone steps:
1st - design in PSD format.
2nd - front end development based on approved app design.
3rd - back end completion
4th - Integration of front end and back end.
Of course, my offer is a bit higher than other freelancer's bid, but when you think about the high-quality product for your successful business, I think it's a correct time and reasonable budget.
I will do my best in order to realize your ideas into reality.
Please contact me, I hope to discuss this job more details.
Thanks and best regards.