Android Phone Spyware Detection and Removal

I am experiencing issues with my Android phone, which I believe may have been hacked. A friend of mine installed a spyware secretly into my phone, since than I tried formatting but as soon as I install any old app, he again hacks my phone. The spyware operates in stealth mode so even packet captures are not able to detect them.

Here's what I'm looking for in a successful candidate:

- Extensive experience with Android OS
- Strong knowledge and understanding of spyware, malware, and other malicious mobile apps
- Proven ability in diagnosing and resolving mobile hacking issues

Your prime responsibilities will include:

- Diagnosing the presence of spyware
- My app drawer does not show any spyware. It operates in stealth mode
- Safely removing the identified spyware from my phone
- Providing advice on preventive measures to avoid future hacks

Please apply if you've successfully handled similar projects before.