I have been working in software industry for 22 years, and during that period I have been using VI/VIM as one my primary tools among other tools.
I have been leading product development teams using Android, advising startups on software development., reviewing architecture as well as doing IoT projects.
I have worked on wide range of technologies from web to embedded system to android.
For last seven years I have been working in Android framework as well as Android apps.
Checkout my app on Google play store , search for "smart math trick" by chaturlab.