Month: September 2021

We’re sharing details about Mariana Trench (MT), a tool we use to spot and prevent security and privacy bugs in Android and Java applications. As part of our effort to help scale security through building automation, we recently open-sourced MT to support security engineers at Facebook and across the industry.  This post is the third… Continue reading Open-sourcing Mariana Trench: Analyzing Android and Java app security in depth

It is vital that a microservice striving for high availability have at its disposal several choices on how to rollback changes when unforeseen production issues occur. A very interesting article comes to mind from O’Reilly, Generic Mitigations, where the theme is to restore service functionality FIRST and FAST — and THEN root cause the real fix as… Continue reading Switch It Up!

Facebook invests in subsea cables as part of our continued efforts to build the infrastructure that carries internet traffic and helps bring more people online to a faster internet. Today, we are thrilled to announce, along with regional and global partners, a new segment of subsea cable called 2Africa Pearls, which connects three continents —… Continue reading 2Africa Pearls subsea cable connects Africa, Europe, and Asia to bring affordable, high-speed internet to 3 billion people

Managing app size at Facebook is a unique challenge: Every day, developers check in large volumes of code, and each line of code translates into additional bits in the apps that people ultimately download onto their phones. Left unchecked, this added code would make the app bigger and bigger until eventually the time it takes… Continue reading Superpack: Pushing the limits of compression in Facebook’s mobile apps

For years, in order to safeguard the privacy of people’s messages, WhatsApp has provided end-to-end encryption by default ​​so messages can be seen only by the sender and recipient, and no one in between. Now, we’re planning to give people the option to protect their WhatsApp backups using end-to-end encryption as well. People can already… Continue reading How WhatsApp is enabling end-to-end encrypted backups

Caching plays an important role in helping people access their information efficiently. For example, when an email app loads, it temporarily caches some messages, so the user can refresh the page without the app retrieving the same messages. However, large-scale caching has long been a complex engineering challenge. Companies must balance the fast experience people… Continue reading CacheLib, Facebook’s open source caching engine for web-scale services