Android Developer living in London, UK. I have use the following in my projects:

• SQLite • Firebase Authentication • Firestore NoSQL DB • Google Cloud - proxy for REST API calls • Fragments • Leak Canary • Google SDK and web services APIs • Lottie Animations • MediaPlayer • AdMob, including running own campaigns • Espresso • RecyclerView / ViewHolder • Singleton Pattern • CEL - for Firestore rules • Python • Google Cloud Platform - proxy server for REST requests