Better Android Testing at Airbnb

In part three of this series we saw how automated interaction testing can cover some of the code paths in our ViewModels by recording state changes. However…

Continuous delivery for your Kotlin Multiplatform library

As part of the Bumble family— the parent company operating Badoo and Bumble apps — one of my main projects was involved in the team that created Reaktive library — Reaktive Extensions on pure Kotlin. In the case of Kotlin Multiplatform I discovered that continuous integration and continuous delivery require…

Striving for iOS App Performance

Getting Started This year, Strava achieved a milestone of 1 billion new activities in 18 months*. The first billion activities were recorded over 8 years. Our rapid growth has created new engineering opportunities. One of the focus areas in the past year was our app’s performance. As…

I went to a conference on tech leadership, and you should too

In the past few weeks, I got a lot of those. For some reason in our community (or at least, in the subset of it I am currently involved with), a tech conference should be about learning actual technical skills (this…

GokuL: Extending time series data storage to serve beyond one day

At Pinterest, developers rely heavily on Statsboard to monitor their systems and get alerted when issues happen. Last year, we introduced our time series database (aka Goku) which stores and serves the most recent one day’s…

Dynein: Building a Distributed Delayed Job Queueing System

An Airbnb Plus listing in Argyll, Scotland Introduction Asynchronous background jobs can often dramatically improve the scalability of web applications by moving time-consuming, resource-intensive tasks to the background. These tasks are often prone to failures, and retrying mechanisms often make it even more expensive…

Netflix Hack Day — November 2019

Hack Day at Netflix is an opportunity to build and show off a feature, tool, or quirky app. The goal is simple: experiment with new ideas/technologies, engage with colleagues across different disciplines, and have fun! We know even the silliest idea…

Better Android Testing at Airbnb

Interaction Testing Part two of this series covered our screenshot testing approach. As our first integration tests, screenshots filled a gaping hole in our testing strategy and were immediately…

Powering the logistics of social good

Announcing an open call for in-kind grants in partnership with ReFED, the leading food waste think tank By: Sueli Shaw, Social Impact In six years, DoorDash has built a logistics platform supporting 4,000 cities across the 50 U.S. states, Canada, and Australia. Through last-mile delivery, we help local merchants expand their footprint and reach new customers, provide flexible opportunities for Dashers and help customers save valuable time…

Real-time User Signal Serving for Feature Engineering

More than 320 million unique visitors come to Pinterest every month to discover inspiring content, which also gives advertisers a unique opportunity to get their products in front of people with commercial intent. Curation…

An Introduction to Engineering @ Addepar

Addepar is tackling problems in one of the most underserved areas of financial tech and we’re doing it at a level of sophistication and scale that few can match. All of our clients, primarily wealth managers, have similar end-goals: to help their own clients plan better for the future and…

Meet the Teams @ Addepar

CompArch CompArch (Computational Architecture) is responsible for…

(re) Building Trust by Doing Less

As engineers, we’re often concerned with doing more. How can we ship more features, handle more scale with our services, or write more code? While there is certainly benefit in learning how to do more, there are also times where intentional restraint can pay off handsomely. I was reminded of…

Open-Sourcing Metaflow, a Human-Centric Framework for Data Science

tl;dr Metaflow is now open-source! Get started at metaflow.org. Netflix applies data science to hundreds of use cases across the company, including optimizing content delivery and video encoding. Data scientists at Netflix relish our culture that…

Data Compression for Large-Scale Streaming Experimentation

Ever wonder why Netflix works so well when you’re streaming at home, on the train, or in a foreign hotel? Behind the scenes, Netflix engineers are constantly striving to improve the quality of your streaming service. The…

prox part 3 — effect abstraction and ZIO

Intro The first post introduced the prox library and demonstrated the advanced type level programming techniques it uses. Then in the second part of this series, we experimented with replacing the streaming library from fs2 to Akka Streams. In both cases, the library used cats-effect for describing side effects. But it…

Integrating Siri in Existing E-Commerce Apps

Opportunity for Brands with Existing Apps In 2018, Apple announced that there were 500 million devices in the world that used Siri voice assistant. That has a huge…

Better Android Testing at Airbnb

In our first article we looked at the MvRx mocking system, and the Launcher that opens any screen or mock in the app. While…

How DevOps Is Making Managers Redundant And Why That’s a Good Thing

A guide to scaling tech organizations without adding too many people or processes. I head product and engineering for Grofers, the largest online grocer in India. Grofers has grown by over 11x — from $60MM in GMV to nearly $700MM — in the last 24 months. A big part of this success has been the ability of our team to go from idea…

Eat small. Make a big impact.

This weekend, we’re celebrating these businesses by encouraging customers to dine…

PHP Xdebug proxy: when Xdebug’s standard capabilities are insufficient

Xdebug is often used for debugging PHP programs. However, IDE and Xdebug’s standard capabilities are not always sufficient. Some, but not all, problems can be resolved using the Xdebug proxy, pydbgpproxy. This is why I have created a PHP Xdebug proxy based on the asynchronous framework, amphp. In this article…

Using Kafka to throttle QPS on MySQL shards in bulk write APIs

At Pinterest, backend core services are in charge of various operations on pins, boards, and users from both Pinners and internal services. While Pinners’ operations are identified as online traffic because of real-time response, internal traffic is identified as offline because processing is…

prox part 2 — akka streams with cats effect

Intro In the previous post, we have seen how prox applies advanced type level programming techniques to express executing external system processes. The input and output of these processes can be connected to streams. The current version of prox uses the fs2 library to describe these streams, and cats-effect as an…

Give the Gift of Food this Holiday Season

Gift your friends and family with the foods they love from more than 310,000 local and national stores across the country, like The Cheesecake Factory, McDonald’s, Chipotle, and Chili’s. Plus, saving time ordering in with DoorDash makes for easier evenings, happier days, and more time to enjoy the people and things they love during this busy time of year. These gift cards are currently available to our customers based in the United States. Especially as this is the shortest holiday shopping season yet, our new DoorDash gift cards are a perfect time-saving or last-minute gift, as they’re available online and in-stores and can be sent + received in minutes! Here’s how it works: All you need is the recipient’s email! There is no expiration of the gift card, and it can be used on any store in on DoorDash’s platform. To redeem a gift card: Recipients will need to enter the code shown on the gift card into the DoorDash app or online before placing their order. The DoorDash gift card can be used to pay for everything–food item cost, service fees, delivery fees, and tips. Where to buy DoorDash gift cards online: Via the DoorDash website, Amazon.com (digital or physical cards), Paypal.com, BestBuy.com, and Walmart.com. Where to buy physical DoorDash gift cards in-store: Target, Best Buy, Albertsons, Giant Eagle & Safeway We’re wishing you and yours a delightful holiday season and hope our latest product, gift cards, can help fuel more memorable moments throughout the holidays and into 2020.

Netflix at AWS re:Invent 2019

AWS re:Invent is a couple weeks away and our engineers & leaders are thrilled to be in attendance yet again this year! Please stop by our “Living Room” for an opportunity to connect or reconnect with Netflixers. We’ve compiled our speaking events below so you know…