What and how many people (programmers, testers) do you need to develop an application?

Question

Mobile development

Need to hire people to develop the application. The capital allows no more than 10 people. You need to make the right team. Must be a team lead, tester(s) programmer(s). If everything is more or less clear with the team lead, since he is 1.
How many, what qualifications (junior, middle, senior) should a programmer, tester be? Project on the level of complexity instagram, maybe a little easier.

Answer 1

Instagram is a simple application only on the outside. It has a huge network architecture. Here you will need both an architect (cloud) and devops (cloud) and several developers (ios + android) + testers + lead. And it is not clear that 10 people are for you. One person in IT costs from $1k to $8k per month)
PS I forgot about the fact that you also need a designer and UX specialist

Answer 2

If you have 200k a month for every senior programmer, then you are welcome. And so, hire 1-2 seniors, the rest are middle, junior, I would not recommend. You need to work with them and they will bear fruit in at least half a year, and even your middle/senior should constantly work with him.