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How we use Mocha and jsdom with CoderPad for Frontend interviews

September 27, 2016

At Wealthfront, our goal for interviews is simply to assess whether the candidate would be successful as an employee. The most important thing for us is to learn how they think and if they will excel at the job we are hiring them for. When interviewing frontend engineering candidates, we want them to write real… Read more

Enforce REST API Standard with Swagger

August 31, 2016

At Wealthfront, we have an API server which exposes a REST API that’s consumed by our iOS and Android apps. Recently we decided to migrate our web frontend to use the REST API because we believe it would be beneficial to have all of our frontends sharing a single data source. We identified a few… Read more

Consistent Test Setup Across Multiple Packages

August 23, 2016

At Wealthfront, we believe that all code should look like it was written by the same person. In practice, that means that across our frontend stack we enforce consistent patterns, follow code style guidelines, and use the same technologies. This enables engineers to easily contribute to projects they have never worked on before by reducing… Read more

Intelligent Metrics Monitoring

August 12, 2016

Here at Wealthfront we have many offline computations running in Spark. In some cases, small changes have caused a job to slow down dramatically, and other times, the size of the input may be growing and causing the job runtime to quickly increase. We normally check pipeline runtimes manually to make sure jobs are running… Read more

Tips for Unit Testing D3

July 27, 2016

Note: D3 4.0 has been released, but we haven’t upgraded¬†to it yet, so the syntax in the code examples below is written for D3 3.x. However, the same ideas should hold for the newer version. If you’ve ever attempted to write unit tests for D3.js code, you’ve undoubtedly noticed some pain points. Many are due… Read more

Integrating Apache Spark into your existing Hadoop system – Part I

June 22, 2016

As evidenced by our previous blog post, Statistics is Eating the World, data is at the very center of Wealthfront’s values. At¬†Wealthfront, fields ranging from research, analytics to marketing, client services, human resources and even employee productivity all heavily rely on data in their decision makings. Such a variety of data sources and requirements need… Read more