For readers who don’t know about us already, Quizlet’s mission is to help our users practice and master whatever they’re trying to learn. We primarily do this by building tools for learners to create, study, and share content, with more than 50 million students and teachers using our product each mo...

Some bugs don’t become problems until long after they’re deployed. Finding those dormant bugs is often more difficult because it’s hard to know where to look! In this post, I’ll be outlining the adventurous discovery of one such bug at Quizlet. Back-to-school season in September is the busiest t...

Every startup starts by finding product market fit. To do this, you build as quickly as possible and take shortcuts when needed. However, once you find that product market fit, it’s important to start resolving those shortcuts (aka tech debt) in order to invest in your future velocity. Quizlet has...

It seems that everyone nowadays wants to be more productive, efficient and focused. It makes a lot of sense since we are surrounded by distractions and everything competes for our attention (facebook, co-workers, ads, blogs and friends). How do we stay focused and use our attention wisely? There are...

As described by the PCI Security Standards Council, early versions of the TLS security protocol are susceptible to widespread exploits that could expose potentially sensitive data. On June 30th, we upgraded Quizlet's security to require TLS 1.2 or higher as part of our continued following of best-...

Post by Shaun Mitschrich, an Infrastructure Engineer for Quizlet’s Platform team. Quizlet is upgrading its method of Secure Communication (SSL/TLS) to TLS 1.2 or higher beginning July 1, 2018, in order to align with industry best practices for security and data integrity. The vulnerabilities with...

With more than 30 million active users every month who depend on Quizlet for their everyday studying and learning, we want to make sure they stay happy with what our application has to offer and that no features are broken while they’re using it. Part of how we achieve that is through end-to-end f...

Quizlet aims to make studying better for students, and it’s important that our tools are not only fun and engaging, but also effective. One big part of that is helping students focus on the terms that need the most work, but another important challenge is choosing the right question format for stu...

When more than 20 million people use your service each month, how and when you roll out a redesign matters. When considering making a big update, we knew we had to make it better for our users not just aesthetically but also functionally — with no disruption to studying. Over the past year, we’ve ...

Quizlet's has a fast-growing community of 25 million active users who log hundreds of millions of events daily. This massive influx of data allows us to do a lot of cool things, from gaining a better understanding of how students and teachers use Quizlet, to improving Quizlet's efficacy as a great...

Note: Long-Term Learning is no longer available on Quizlet - Learn more about Quizlet's new feature, spaced repetition powered by Memory Score and Scheduled Review. Here at Quizlet, our goal is to help students practice and master whatever they’re learning — and to do it as efficiently as possibl...

by Peter Bakkum and Dan Cepeda Like many startups, Quizlet faces a huge challenge in scaling our databases. We use MySQL to power our website, which allows us to serve millions of students every month, but is difficult to scale up — we need our database to handle more writes than a single machine c...

When your product spans web, iOS, and Android, sharing code between apps not only saves a lot of engineering time, but also results in user benefits: shorter iteration cycles, cross-platform availability, and consistency. Code sharing is particularly useful when your code requires constant tweakin...

This spring, we released our first real-time game for classrooms, Quizlet Live. Our beta included over 1 million students and teachers and since launch a month ago, we've added another 3 million. Now, it's grown to 1 million weekly users. These numbers are evidence that we built an engaging, educati...

In 2015 we migrated Quizlet from our legacy host to a large cloud provider. AWS is the default choice for most companies, but after comparing the options, we went with Google Cloud Platform (GCP). This is a summary of our analysis. Quizlet is now the ~50th biggest website in the U.S. in terms of tr...

We built a new game on Quizlet called Gravity to help students learn vocabulary while having fun. As words fall down your screen from outer space in the form of "asteroids," you race to type the answer before they hit the planet. Building all the animations we needed in React gave us an opportun...

We recently released a new study game on Quizlet, Gravity. This post is about how we came up with the idea on a hack night, iterated with tens of thousands of students and teachers, and then released the game to millions on the Quizlet website. Students in Oakland, CA testing out Gravity ### Co...

At Quizlet, we strive to make study tools with great, intuitive user experiences, even if that means dealing with the unique issues that building complex Android UIs produce. While building the feature that allows users to create sets of content on the Quizlet Android app, the ideal UI we designed f...

At Quizlet, we want to learn how to make our users' learning experience even better and a lot of that comes from understanding what our users are doing on Quizlet. And over the past few months, we've constructed our own data pipeline to better inform us about what's happening on Quizlet - no small f...

Privacy and security on the Internet have been major news topics recently. As a top 50 website in the U.S., we take our responsibility to provide a safe and secure service very seriously. With that in mind, we are very happy to announce that Quizlet is now serving 100% of its traffic over HTTPS. T...