I've had success finding frontend developers in dedicated communities like Frontend Mentor or even Twitter.
Now I need to hire a backend (Java/SQL/Azure) contractor developer and have no idea where to find them.
I prefer communities over job boards or LinkedIn because the conversation starts organically and you can hire them much faster so any recommendations would be hugely appreciated!
You can check out Reddit, there are a few communities focused on Backend only.
On another note, I am a Java/SQL/AWS/GCP developer.
Let me know if I can help you in anyway (refer to a few devs within my community etc)
Thanks
Dimitris, what kind of product are you making? I'm working on a project to help employers find devs by their stack. Checkout https://stackmuncher.com, but I don't track Java yet.
Actually, are you sure you want to go with Java?
Startups try to avoid it because it is waning in popularity and you'll have to compete with enterprise employers for Java engineers.
An Angular Chrome extension with a backend using the stack I mentioned.
Java because it's our main language and still the most popular one. But yea competing with enterprises is turning out to be a challenge!
You can consider Kotlin too. It gains popularity among start-ups (and corporate), yet it's easy to learn for the Java devs.
When it comes to community, the best one is an official Kotlin channel.