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Niu Guangyuan

Streamlining Asynchronous Programming on Android

Background Asynchronous programming plays a vital role in mobile development, ensuring that applications remain responsive to user input even while fetching data from databases or networks. At Wealthfront, we heavily rely on asynchronous programming for making network calls to the Wealthfront API server on Android. Initially, RxJava was the go-to choice for this purpose, serving… Read more

October 02, 2023 , , , ,

Chris Mathew

Creating Android Lint Checks: A Survival Guide

At Wealthfront, we’ve observed that the cost of resolving an issue becomes exponentially higher the later it is discovered. For example, a defect discovered at design time is far easier to resolve than one which has already reached our clients. And between those extremes, we can discover issues at code authoring, compilation, or automated test… Read more

September 12, 2023 , , ,

Chris Mathew

Designing a harness for readable, thorough Android tests

At Wealthfront, we are committed to automation – both in the products we build, and in how we ensure quality. In this post we’ll explore how our automated test harness enables Android developers to quickly build tests for almost any scenario. Part 1: Writing “fluent” Espresso test code Since they are designed to operate in… Read more

September 14, 2022 , , , , ,

Andrew Easton

Retrying e2e test suites with Jest

At Wealthfront, we pride ourselves on reliable test coverage across our codebases. However, like many engineering teams, we haven’t been able to completely eliminate flakiness from our end to end (e2e) test suites. While migrating to puppeteer certainly helped, it didn’t eliminate the problem entirely. We’ll get into what causes these flakes below, but suffice… Read more

April 21, 2022 , ,

Wealthfront Team

Automating Data Quality Checks on External Data

Written by Emily Shiue and Melissa Chen The code was simple: query the third party API, if the “ModifiedAt” date returned was more recent than ours, send a notification to our clients. We had all the unit tests, integration tests, and monitoring in place. It had been running smoothly in production for months. So how… Read more


Jason Chambers

Migrating from Capybara to Puppeteer

A little over 9 months ago, Wealthfront converted 100% of our end-to-end tests from Selenium (via Capybara) to Puppeteer. The process involved converting hundreds of tests that provide coverage for just about all of Wealthfront’s product offerings on the website. This blog post will cover why we migrated away from Selenium, the process we used… Read more