Peter Krause

As a core team member, I helped develop the app for one of Brazil's largest delivery companies.

Drivers perform hundreds of deliveries throughout the day, and as the app kept growing, thousands of new deliverymen migrated to it resulting in a dramatic increase in use in a very short period of time.

Profound optimization measures had to be employed, such as meaningful database indexes and proper caching tricks to make sure the server could keep handling so many users.

We also employed DevOps techniques so that at certain times of the day servers could use more cloud computing instances in order to process the huge request load.

We also integrated routing features (both Google and HERE routes) and were a key feature of the app—bringing outstanding aid to delivery drivers when they went to cities they had never visited before.

After building the main service, I spearheaded the development of a new module. This new service's purpose was to track lost deliveries and ensured that administrators could act when delivery items were lost or B2B clients contested expenses or made claims.

These lost packages had a million-dollar impact on the company's gross income and the feature drastically cut down costs once it went live.

I was the lead developer of both the Android app and back-end server for the Ultimate Fan app: a multi-tenant, easily customizable white-label application for sports teams.

The mobile app's features were all configurable from the back end's CMS—from the home screen color and details to each displayed message on the dialogs throughout the app.

One of the app's most ambitious feature is an audio integration that enabled the stadium organizers to play a high-pitch, barely noticeable sound. The apps would then convert this sound into a sequence of flashes after "hearing" them. The fans can then raise their devices and be part of one huge mass of flashing lights synchronized with their team's chant or song.