Hello, thanks for ask. Well, in the Web are specialized sites for coders, developers and testers. I reccomend you the three I consider best for your searching:

1.Toptal: It matches the a good percentage of freelance developers with employers. Based on your project description, you will be matched with the developer most suited for the job. You will then have two weeks to decide if they are right for you.
2. Matchist: This site connects top freelance developers with entrepreneurs and startups. You submit your project, and they will give you three great developers from which to choose. Matchist accepts only 15 percent of developer applicants to their network.
3. Guru: Guru allows you to look for specific services and people who provide them. These include general programming, language-specific programming, software, and management.

I hope this info would be useful for you.

Greetings.

Contacting freelancers may be cheaper than outsourcing tasks to a game development company, but you would see the difference. You can have an incredible idea, but an amateurish studio or a newbie-freelancer will just waste your time, money and even destroy your will to dive into game development

The best way to find an appropriate development team is to look for them on websites called directories. For example, visit Clutch.co, ThinkMobiles, AppFutura, GoodFirms, IT Firms and choose required features (location, hourly rate, etc.).

However, let us help so you don’t have to waste your time looking through different directories and freelance-platforms. If you're looking for an experienced game development team, here we are: https://knocknockgames.com/game-development

I am a Technical Director at a major studio and have been in the industry for over 20 years. LinkedIn is your best bet. Mobile developers will come to you (even when you don't want them to). If you make a public post asking for mobile game developers you will very likely get inundanted with offers from every corner of the earth. You can also make a request on Twitter using the tags #indiegamejobs #gamejobs and #gamedev and mobile game developers often watch those tags so they can respond (even when they're not desired) to posts where people are looking to get game ideas developed. Be careful of companies which show mostly web development experience -- they will also build games for mobile devices and that's not what you want. Look for companies that use Unity, Unreal, or similar engines and have a portfolio of games still live on the app stores that you can play and check our for quality.

Feel free to call me if you want to chat further!