Heal - On-demand doctor house calls for adults and kids.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Pager - Doctor house calls on demand
Drift - A messaging app that helps you grow your business.
Theranos - A consumer healthcare technology company
C++ - Has imperative, object-oriented and generic programming features, while also providing the facilities for low level memory manipulation