Spark Protip: Joining on skewed dataframes

At Simpl, most of our data and ML pipelines are highly dependant on Spark. And we all…

Deterministic A/B tests via the hashing trick

In principle A/B testing is really simple. To do it you need to define two separate user experiences, and then randomly allocate users between them:

def final_experience(user):
    if random.choice([0,1]) == 0:
        return…

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The Simpl Story — Part 1

On Trust, Mistrust and Money

Flashback

Rails Upgrade from 4.2 to 5.0

It is a good practice to keep an application upto date with the major released versions. Rails 5 is got some exciting features to look out and improve the web development workflow. Here are the key features and steps to upgrade Rails 4.2 to 5.0.1.

Road to React Native

Until few months back, the Simpl Android and iOS apps were fully native. The Android app is written in Java and the iOS app in Swift. It was time to bring in a new feature and this time we had a different idea in mind.

Journey of Data Sciences Lab @ Simpl

When we started in 2015, from our tiny office in Juhu (Mumbai), we pretty much had single…

The Simpl Story — Part 2

On Making Money Simple

Concatenative Inheritance over Prototypal Inheritance

for scalable and reusable code in Simpl JSSDK

So, I was asked to write a Javascript SDK for Simpl Integration. It was a time when our very first big merchant named Faas️❤️s had agreed to integrate Simpl in their…