Rewriting the heart of our sync engine
Over the past four years, we've been working hard on rebuilding our desktop client's sync engine from scratch. The sync engine is the magic behind the Dropbox folder on your desktop computer, and it's one of the oldest and most important pieces of code at Dropbox. We're proud to announce today that we've shipped this new sync engine (codenamed "Nucleus") to all Dropbox users. Rewriting the sync en
The Great CoffeeScript to Typescript Migration of 2017
Editor’s preface: When I first joined Dropbox in May 2017, we were at the tail end of our CoffeeScript to TypeScript migration. If you wanted to make changes to a CoffeeScript file, it was considered common courtesy to convert it to TypeScript while you were at it. Parts of our codebase were still using react-dom-factories and we had a custom flux implementation predating Redux. I knew our web pla
Our journey to type checking 4 million lines of Python
Dropbox is a big user of Python. It’s our most widely used language both for backend services and the desktop client app (we are also heavy users of Go, TypeScript, and Rust). At our scale—millions of lines of Python—the dynamic typing in Python made code needlessly hard to understand and started to seriously impact productivity. To mitigate this, we have been gradually migrating our code to stati
The (not so) hidden cost of sharing code between iOS and Android
The (not so) hidden cost of sharing code between iOS and Android Until very recently, Dropbox had a technical strategy on mobile of sharing code between iOS and Android via C++. The idea behind this strategy was simple—write the code once in C++ instead of twice in Java and Objective C. We adopted this C++ strategy back in 2013, when our mobile engineering team was relatively small and needed to s
How we rolled out one of the largest Python 3 migrations ever | Dropbox Tech Blog
How we rolled out one of the largest Python 3 migrations ever Dropbox is one of the most popular desktop applications in the world: You can install it today on Windows, macOS, and some flavors of Linux. What you may not know is that much of the application is written using Python. In fact, Drew’s very first lines of code for Dropbox were written in Python for Windows using venerable libraries such
MacOS monitoring the open source way
Let’s say a machine in your corporate fleet gets infected with malware. How would you detect it? How could you find out what happened on the machine? What did the malware do? Did it steal your browser’s passwords? What network connections did the malware make? Was it looking for crypto currency? By having good telemetry and a good host monitoring solution for your machines you can collect the cont
Creating a Modern OCR Pipeline Using Computer Vision and Deep Learning
Creating a Modern OCR Pipeline Using Computer Vision and Deep Learning In this post we will take you behind the scenes on how we built a state-of-the-art Optical Character Recognition (OCR) pipeline for our mobile document scanner. We used computer vision and deep learning advances such as bi-directional Long Short Term Memory (LSTMs), Connectionist Temporal Classification (CTC), convolutional neu
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