The Corner

Two-factor authentication made even easier.

A fluent image downloading and caching library for Android.

Speak with engineers about our open source offerings

A declarative, type-safe REST client.

Plugins to complement Dagger and Otto.

The essential framework for testing Android applications

Small and focused libraries doing one task well.

Why we created a new dependency injector for Android.

Releasing major milestones of our open source projects.

Square’s new HTTP client for Android and Java.

Square’s own Engineering Manager Zach Brock recently participated in a live webcast entitled Startup Life. Here are answers to some of the questions they didn’t have time to answer.

A dive into the information radiators in use at Square.

You can move faster when other people can contribute to your projects and unblock themselves.

An oft-overlooked aspect of development gets a fresh look.

Show your Java-fu by calculating the unkown.

Showing a calendar is easy. Showing it quickly isn’t quite so simple.

Show your Java-fu by calculating the unkown.

A central listing of our open source projects.

A look at a Ruby gem that Square’s Business Intelligence team wrote to facilitate ETLs.

Building on open tools and data to share our payments story under a tight deadline.

A look at what a few of our engineers did last Hack Week.

Using the draft ES6 module syntax in today’s frameworks and applications.

A fast, customizable calendar component with full internationalization support.

Combining the compression of JPEGs and the transparency of PNGs for a 90% compression gain.

Squash makes it easier to find and fix your bugs by providing advanced notification and analysis tools.

Unit testing Android apps with Mockito and DexMaker.

What’s a summer as a Square Intern like?

Remote network and data debugging with Chrome Developer Tools.

Check out the new helper we’ve released to cut down on the verbosity of Cascading Flows.

Tracking down a deep Android bug.

An exciting interview with Square Front-End Engineer Madelin Woods.

Capturing even more beautiful signatures on Android.

This week, we welcomed a group of talented engineers who will be based in Atlanta.

An enhanced Guava-based event bus with emphasis on Android support.

How we maintain consistent API documentation.

An exciting interview with Square Android Engineer Eric Burke.

Why adding ActionBarSherlock to your applications early will save developer time in the future.

Improve the observability of asynchronous jobs by recording and visualizing behavior over time.

How we built our web analytics panel with Ember and D3.

A new gem for Ruby 1.9 to assist in keeping code quality high.

SocketRocket is a new WebSocket client library developed by Square’s engineering team

Do you have what it takes to escape the Luhny Bin?

A continuous integration server for running your tests on every commit.

An overview of our pairing interviews and why they’re awesome.

An intro to Sass and Compass for CSS fans.

A quick survey of Square codenames.

Announcing an open-source system for visualizing time series data, built with MongoDB, Node and D3.

A framework for integration testing iOS by simulating user interaction.

Innocuous details like load balancing web servers can produce downstream results in hard to predict ways.

Presenting a gem to import KML files and detect whether or not points are contained within defined regions.

A case for PostgreSQL in a modern web architecture.

Heed fsync errors, especially on Android.

Test your named scopes with Ruby code

Processing asynchronous jobs deterministically

Capturing beautiful signatures on Android