Let’s say you had a great new idea for a Todo app and set out to build an awesome iPhone application. After firing up your copy of Xcode, you’d probably start by creating a UITableView – a critical part of the iOS SDK that allows you to build scrolling views. At Yelp, we’ve been playing around with different table view architectures for years. After a lot of trial and error, we’ve come up with a framework that easily scales from the simplest list all the way up to our business page. We’re open sourcing it today – check out YLTableView...

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WWDC is coming up soon and it’s going to be a blast! We’ve got our Apple Watch (with our lovely Yelp App installed, of course!) and are ready to party. To celebrate, we’re hosting our third annual WWDC party on June 8 and raffling off an Apple Watch (so you can use our app too)! While you’re in town for WWDC, make sure to catch some of the other great meetups we’ve got lined up. We’ll also be speaking at a Women in Tech event at Alpine Labs and at a DBA Happy Hour co-hosted with Box! We’re also really...

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Being able to easily find what you want on Yelp is a critical part in ensuring the best user experience. One thing that can negatively affect that experience is displaying duplicate business listings in search results, and if you use Yelp often enough, you might have run into duplicate listings yourself. We constantly receive new business information from a variety of sources including external partners, business owners, and Yelp users. It isn’t always easy to tie different updates from different sources to the same business listing, so we sometimes mistakenly generate duplicates. Duplicates are especially bad when both listings have...

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You’ve probably read about the recent AFNetworking vulnerability. Nowadays, it’s not sufficient to just test your SSL certificates. You must also test how your clients use these certificates to have confidence your users aren’t getting pwned. There are plenty of tools to test broken cipher suites and cryptographic vulnerabilities but, until now, there wasn’t a readily-available, free, and simple tool for testing how your client handles certificate requests and X.509 verification over the wire. Enter tlspretense-service. This tool provides a simple Docker container built around iSEC Partner’s tlspretense certificate testing suite that acts as a MitM to test your clients....

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Last week we held our second tech talk, focusing on mobile, in a new internal series we launched this year. The presenters covered two very important topics in mobile: wearable apps and testing. Building Our Apple Watch App The evening started with a talk by Bill M. who lead the efforts to build our Apple Watch app. We knew we had to build the app in order to provide our users with the best possible access and experience. Since the platform was brand new and kept changing, it came with its own challenges. Development needed to be planned carefully to...

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Yelp generates terabytes of logs every day. Starting in 2010 with the release of mrjob, Yelp has relied heavily on Amazon Elastic MapReduce (EMR) and MapReduce jobs to analyze this data. While MapReduce works well to repeatedly answer the same question, it’s not a great tool to answer questions that are not well defined or that need to be answered only once. Consequently, we started using Redshift, Amazon’s Postgres-compatible column-oriented data warehouse, to explore our data. Yelp’s log data already lands on S3 every day making it a convenient location to stage data for loading into Redshift. Unfortunately, most of...

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Yelp connects people with local businesses and along the way we’ve gathered rich data about customers’ experiences at those businesses via reviews, tips, check-ins and business attributes. We are constantly asking ourselves how the collective wisdom of Yelpers can be used to better inform cities in their efforts around protecting the health of our communities. In particular, could we use Yelp’s reviews and business information to make the process of sending Health Inspectors to restaurants more efficient? According to the Centers for Disease Control, more than 48 million Americans per year become sick from food, and an estimated 75% of...

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Yelp has had an iOS app for as long as third-party iOS apps have existed. Maintaining a codebase with that much history is always interesting and sometimes challenging, and one of the biggest challenges is dependency management. For a long time, git submodules met most of our needs and caused relatively few headaches. However, the submodule approach made it difficult to understand what unanticipated or even breaking changes will be introduced when bumping a submodule by a commit – or several. A Git SHA has no concept of versioning. Additionally, adding a new library often required changes to the build...

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