from an engineer POV, you get so many approaches from linkedin and others, that you become indifferent to them.
I guess, the ones that stop and catch my attention are the ones that are going after my passions - having a big impact in the company - (come as a first employee and etc), or have a "saving the world" goal.
and also something that will work with my schedule - I'm not going to quit my job at the next couple of months, but let's talk about the when and how
Try Freelance sites like Fiverr or Upwork. I've had various work done by the independent contractors for a fraction of the cost.
Old post, evergreen question.
I used to ask my fellow programmers: suppose that I need you, how do I find you?
Programmers read alot of programming stuff, so buying an Ad on stackoverflow is generally a good idea.
Another one is to climb the network of programmer's friends, starting from the ones you know.
If you have a sense of what you want to build, you need to talk to an architect for an hour to define basic site goals, programming language and user flow. Then, once you know generally the language being used, you can go to a developer meetup, such as a Drupal or Rails user groups.
Talk to developers after you know exactly what is going to be on the page.
It totally depends on your development needs. If you just want to get an app developed, then setting up an in-house team is not a good thought. You should consider outsourcing your app development work to any app development agency, in that case. But, if you want to build a business around a product i.e. your app, then hire full-time app developers for your venture.
Tips to find app developers:
I hope these tips will help.
If you've not any idea or not getting a solution of your query, referral is the best way. Don't hesitate to ask your problem to friends, colleagues and relatives.
Look for the company that has a story of building successful applications and the expertise needed to cover all the aspects. Meet the managers and the team to know who you will be working with and at what stage.
Before going into development and finding talents, I'd first make sure you have a full high-fidelity working mock-up with design to build. I assume that you have done extensive user testings on them.