Khan Engineering

Khan Engineering

We're the engineers behind Khan Academy. We're building a free, world-class education for anyone, anywhere.

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Latest posts

Kotlin for Python developers

Aasmund Eldhuset on November 29

Using static analysis in Python, JavaScript and more to make your system safer

Kevin Dangoor on July 26

Kotlin on the server at Khan Academy

Colin Fuller on June 28

The Original Serverless Architecture is Still Here

Kevin Dangoor on May 31

What do software architects at Khan Academy do?

Kevin Dangoor on May 14

New data pipeline management platform at Khan Academy

Ragini Gupta on April 30

Untangling our Python Code

Carter J. Bastian on April 16

Slicker: A Tool for Moving Things in Python

Ben Kraft on April 2

The Great Python Refactor of 2017 And Also 2018

Craig Silverstein on March 19

Working Remotely

Scott Grant on Oct 2, 2017

Tips for giving your first code reviews

Hannah Blumberg on Sep 18, 2017

Let's Reduce! A Gentle Introduction to Javascript's Reduce Method

Josh Comeau on Jul 10, 2017

Creating Query Components with Apollo

Brian Genisio on Jun 12, 2017

Migrating to a Mobile Monorepo for React Native

Jared Forsyth on May 29, 2017

Memcached-Backed Content Infrastructure

Ben Kraft on May 15, 2017

Profiling App Engine Memcached

Ben Kraft on May 1, 2017

App Engine Flex Language Shootout

Amos Latteier on Apr 17, 2017

What's New in OSS at Khan Academy

Brian Genisio on Apr 3, 2017

Automating App Store Screenshots

Bryan Clark on Mar 27, 2017

It's Okay to Break Things: Reflections on Khan Academy's Healthy Hackathon

Kimerie Green on Mar 6, 2017

Interning at Khan Academy: from student to intern

Shadaj Laddad on Dec 12, 2016

Prototyping with Framer

Nick Breen on Oct 3, 2016

Evolving our content infrastructure

William Chargin on Sep 19, 2016

Building a Really, Really Small Android App

Charlie Marsh on Aug 22, 2016

A Case for Time Tracking: Data Driven Time-Management

Oliver Northwood on Aug 8, 2016

Time Management at Khan Academy

Several Authors on Jul 25, 2016

Hackathons Can Be Healthy

Tom Yedwab on Jul 11, 2016

Ensuring transaction-safety in Google App Engine

Craig Silverstein on Jun 27, 2016

The User Write Lock: an Alternative to Transactions for Google App Engine

Craig Silverstein on Jun 20, 2016

Khan Academy's Engineering Principles

Ben Kamens on Jun 6, 2016

Minimizing the length of regular expressions, in practice

Craig Silverstein on May 23, 2016

Introducing SwiftTweaks

Bryan Clark on May 9, 2016

The Autonomous Dumbledore

Evy Kassirer on Apr 25, 2016

Engineering career development at Khan Academy

Ben Eater on Apr 11, 2016

Inline CSS at Khan Academy: Aphrodite

Jamie Wong on Mar 29, 2016

Starting Android at Khan Academy

Ben Komalo on Feb 29, 2016

Automating Highly Similar Translations

Kevin Barabash on Feb 15, 2016

The weekly snippet-server: open-sourced

Craig Silverstein on Feb 1, 2016

Stories from our latest intern class

2015 Interns on Dec 21, 2015

Kanbanning the LearnStorm Dev Process

Kevin Dangoor on Dec 7, 2015

Forgo JS packaging? Not so fast

Craig Silverstein on Nov 23, 2015

Switching to Slack

Benjamin Pollack on Nov 9, 2015

Receiving feedback as an intern at Khan Academy

David Wang on Oct 26, 2015

Schrödinger's deploys no more: how we update translations

Chelsea Voss on Oct 12, 2015

i18nize-templates: Internationalization After the Fact

Craig Silverstein on Sep 28, 2015

Making thumbnails fast

William Chargin on Sep 14, 2015

Copy-pasting more than just text

Sam Lau on Aug 31, 2015

No cheating allowed!!

Phillip Lemons on Aug 17, 2015

Fun with slope fields, css and react

Marcos Ojeda on Aug 5, 2015

Khan Academy: a new employee's primer

Riley Shaw on Jul 20, 2015

How wooden puzzles can destroy dev teams

John Sullivan on Jul 6, 2015

Babel in Khan Academy's i18n Toolchain

Kevin Barabash on Jun 22, 2015

tota11y - an accessibility visualization toolkit

Jordan Scales on Jun 8, 2015

Meta

Kotlin for Python developers

by Aasmund Eldhuset on November 29

Earlier this year, the Khan Academy Engineering organization decided to introduce Kotlin as an alternative backend language alongside Python (in which almost all of our existing backend codebase is written) — see the linked post for details on our decision process. While there are a number of excellent resources for learning Kotlin, most of them seem geared towards people who already know Java. So I decided to write a quick "getting started" guide that would explain Kotlin in terms of Python. It ballooned a bit in scope and thoroughness as I wrote it, and ended up being fairly extensive.

In the hopes that other developers will find it useful, we have released the resulting Kotlin for Python developers document publicly! It should also be useful to developers who are used to other dynamically typed languages.

Please note that it is not intended to cover all the features of Kotlin, and that it is written in the form of a textbook rather than as a reference manual. It is not a part of Khan Academy's official product offering, but rather an internal resource that we're providing "as is" for the benefit of the programming community, so the quality bar is lower than for our official educational content — if you find any errors, please submit an issue or a pull request.