One of the things we are proud of is that we are beholden to no one. Our technology choices have always been guided by balancing what we need now and gives us the most long term flexibility. Hence, we have gone with mostly open source solutions.

Frontend: angularjs/javascript; MVVM architecture
Backend: django/python and django REST framework; API-first
Mobile: Android and Apple natives apps built in Kotlin and Swift respectively.
Database: Amazon Aurora MySQL 
Reports: Custom ETL engine using python and pandas library.
BI: Responsive custom-built dashboards that provide customers with insights and reports using Sisense.
Misc: Event driven programming using AWS Kinesis and Lambda to run complex business rules for customers