Philip London in Blockchain.com Engineering

Migrating Production JS apps to TypeScript

I started the process of migrating blockchain.com’s web wallet application from JavaScript to TypeScript in January 2020. My goals were to increase developer productivity, decrease human errors, and improve the maintainability of our app. Our app had been…

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Daniel in Blockchain.com Engineering

Mar 6, 2020

Introducing VIPER with Reducer and State

Having been an iOS engineer for nearly 7 years, I have always been looking for exciting…

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Blockchain.com Engineering in Blockchain.com Engineering

Jun 4, 2018

Kotlin + Akka Part 5: Pub / Sub

The Akka Event Stream provides a pub/sub style API for actors. Actors subscribe to ‘channels’ on the Event Stream; the event is placed in the Actor’s mailbox if the subscription type matches the message.

Blockchain.com Engineering in Blockchain.com Engineering

May 7, 2018

Kotlin + Akka Part 4: Scheduling

By now, you have played around with creating basic Actors and Actor hierarchies. It’s important to note that messages are delivered to Actors sequentially; this means no more than one dispatcher thread will ever call the Actor.

Blockchain.com Engineering in Blockchain.com Engineering

Apr 30, 2018

Kotlin + Akka Part 3: Dispatchers

The Akka Dispatcher defines the wiring of an Actor within an Actor System, such as how the Actor’s mailbox is configured and what implementation of the java.util.concurrent.ExecutorService to use.

Blockchain.com Engineering in Blockchain.com Engineering

Apr 23, 2018

Migrating to Kotlin on Android

It’s no secret that Kotlin is the new hotness for Android development, and for good reason. The language is more concise, handles NPEs safely, and offers features such as Higher Order Functions that have previously not been available on the platform, which is stuck on Java…

Blockchain.com Engineering in Blockchain.com Engineering

Apr 17, 2018

Kotlin + Akka Part 2: Akka Hierarchy

In Part 1, we learned how to create a very simple Actor that prints out the String message it receives. An important concept to understand is that Actors are hierarchical, which means that any Actor created is a child of another Actor. This hierarchy gives Parent…

Blockchain.com Engineering in Blockchain.com Engineering

Apr 11, 2018

Migrating to Downloadable Fonts on Android

At Blockchain, we have many mobile users in bandwidth constrained environments such as developing countries. As such keeping the app small and lightweight is a priority for the Android team. Smaller app sizes increase both installs and conversion rates —…

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Blockchain.com Engineering in Blockchain.com Engineering

Apr 4, 2018

Kotlin + Akka Part 1: Hello Kotlin!

One of the many projects currently underway at Blockchain involves building a real-time platform that runs 24/7, capable of processing thousands of messages a second running, and with an API scaling to millions of requests. There are certainly many ways to approach…

Blockchain.com Engineering in Blockchain.com Engineering

Apr 4, 2018

Building Cryptocurrency Agnostic Components in My-Wallet-V3 and My-Wallet-V3-Frontend

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Blockchain.com Engineering

The Blockchain.com engineering team is building an open, accessible, and fair financial future, one piece of software at a time. Learn more about our work.

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