How to Performance talk at GORUCO 2015. Photo by Jesse Chan-Norris.

Upcoming Talks

Keynote: The Past, Present, and Future of Rails at GitHub
DevOps Enterprise Summit | Remote / Virtual | October 13-15, 2020

Upgrading GitHub to Ruby 2.7
RubyConf | Remote / Virtual | November 17-19, 2020

Past Talks

Technically, a Talk

Peer deep into Rails’ database handling and you may find the code overly complex, hard to follow, and full of technical debt. On the surface you’re right - it is complex, but that complexity represents the strong foundation that keeps your applications simple and focused on your product code. In this talk we’ll look at how to use multiple databases, the beauty (and horror) of Rails connection management, and why we built this feature for you.

Ruby Day Italy Keynote | Remote / Virtual | September 16, 2020
Slides

Brighton Ruby Keynote | Remote / Virtual | July 3, 2020
Video | Slides

RailsConf Keynote | Remote / Virtual | May 5, 2020
Video | Slides

The Past, Present, and Future of Rails at GitHub

On August 15, 2018 GitHub was deployed to production running Rails 5.2. This was a historic event; for years GitHub had been behind Rails and dependent on a custom fork of Rails 2.3. This talk will visit GitHub’s past, including our tumultuous relationship with the Rails framework, and the grueling effort it took to get our application on the latest version. You’ll learn what mistakes to avoid and the reasons why such a difficult upgrade was worth it. We’ll explore what tracking master means for the future and establish that GitHub and Rails are in it together for the long haul.

RubyConf Colombia | Medellin, Colombia | Sept 20, 2019
Slides

EuRuKo | Rotterdam, Netherlands | June 22, 2019
Video | Slides

Balkan Ruby | Sofia, Bulgaria | May 17, 2019
Slides

RailsConf | Minneapolis, MN | May 1, 2019
Video | Slides

Ruby on Ice | Tegernsee, Germany | February 22, 2019
Video | Slides

The Future of Rails 6: Scalable by Default

We’ve all heard the phrase “Rails doesn’t scale”. Long running test suites and no standard for implementing multiple databases makes it hard scale monolithic Rails applications. Rails 6 will start making Rails scalable by default with parallel testing and improved support for using multiple databases. You’ll no longer be forced to reinvent the wheel and create your own solution to these problems. In this talk we’ll take a look why these improvements are important, how they work, and ways in which small ideas can quickly snowball into major changes. This is just the beginning of Rails 6.

Amsterdam Ruby Meetup | Amsterdam, Netherlands | October 16, 2018
Slides

Paris Ruby Conference | Paris, France | June 28, 2018
Slides

RailsConf Keynote | Pittsburgh, PA | April 18, 2018
Video | Slides

The Unbearable Vulnerability of Open Source

If contributing to open source was only about writing code, it would be easy. In reality open source exposes our insecurities and makes us feel vulnerable. Vulnerability can inspire change, but can also paralyze us for fear of not being good enough. In this talk we’ll look at how vulnerability affects open source contributors and explore how maintainers can foster a welcoming community. Contributors will learn how to identify projects with empathetic leaders who value GitHub’s community standards. Cultivating a better environment for contributing makes open source more sustainable for all.

WeAreDevelopers | Vienna, Austria | May 16, 2018
Slides

Ruby Conf | New Orleans, LA | November 16, 2017
Video | Slides

GitHub Universe | San Francisco, CA | October 12, 2017
Video | Slides

Building Rails ActionDispatch::SystemTestCase Framework

At the 2014 RailsConf DHH declared system testing would be added to Rails. Three years later, Rails 5.1 makes good on that promise by introducing a new testing framework: ActionDispatch::SystemTestCase. The feature brings system testing to Rails with zero application configuration by adding Capybara integration. After a demonstration of the new framework, we’ll walk through what’s uniquely involved with building OSS features & how the architecture follows the Rails Doctrine. We’ll take a rare look at what it takes to build a major feature for Rails, including goals, design decisions, & roadblocks.

Day 1 Closing Keynote Speaker at RubyConf Colombia | Medellín, Colombia | September 8, 2017
Slides

Keynote Speaker at RubyNation | Washington, DC | June 16, 2017
Slides

RailsConf | Phoenix, AZ | April 25, 2017
Video | Slides

Security is Broken: Understanding Common Vulnerabilities

The Internet is built on technology that was never meant to work together. Basic features in seemingly simple and innocuous technologies, such as XML, resulted in these technologies being insecure. In this session we’ll talk about how attackers exploit well known vulnerabilities like XSS, XXE, and CSRF and how to make more secure software by avoiding similar decisions that resulted in these exploits.

Abstractions | Pittsburgh, PA | August 19, 2016
Slides

Brighton Ruby | Brighton, UK | July 8, 2016
Video | Slides

Twilio SignalConf | San Francisco, CA | May 24-25, 2016
Slides

Mountain West Ruby Conference | Salt Lak City, UT | March 21-22, 2016
Video | Slides

How to Performance

Understanding performance output can feel like reading tea leaves. It makes sense to a few people, but many of us are left in the dark; overwhelmed and frustrated by the data. On top of that there are a ton of performance tools to choose from; StackProf, RubyProf, AllocationTracer. Where do you even start?

While working on speeding up integration tests in Rails source, I learned that the key to improving the performance of Ruby code is having a baseline, not relying on one profiler and understanding the advantages and limitations of your tools. By utilizing these methods, integration tests are now 3 times faster than they were in Rails 4.2.0, with more improvements being made every day.

In this talk we will not only look at how to read performance output, but when and how to use the right profilers for the job. We’ll discuss a variety of methods and techniques for benchmarking and profiling so you can get the most out of any performance tool.

RubyConf | San Antonio, TX | November 15-17, 2015
Video | Slides

WindyCityRails | Chicago, IL | September 18, 2015
Video | Slides

FullStackFest | Barcelona, Spain | September 1, 2015
Video | Slides

Burlington Ruby | Burlington, VT | August 1, 2015
Slides

GORUCO | New York, NY | June 20, 2015
Video | Slides

Breaking Down the Barrier: Demystifying Contributing to Rails

Contributing to Rails for the first time can be terrifying. In this lab I’ll make contributing to Rails more approachable by going over the contributing guidelines and technical details you need to know. We’ll walk through traversing the source code with tools such as CTags, source_location and TracePoint. Additionally, we’ll create reproduction scripts for reporting issues and learn advanced git commands like bisect and squash. At the end of this session you’ll have the confidence to fix bugs and add features to Ruby on Rails.

RailsConf | Atlanta, GA | April 23, 2015
Video | Slides | Workshop Repo

CRUD! Dear Active Record, It’s Not You, It’s Me

The magic of ActiveRecord database interactions is easy to rely on and allows us assume it knows best. Without a solid understanding of how ActiveRecord translates into MySQL, however, significant issues can arise. This is particularly true with large data sets and complex model relationships. My talk explores an example for each CRUD function and shows how these queries can result in MySQL timeouts, memory issues or stack level too deep errors. The examples will examine the consequences of chaining large datasets, uses for Arel, and how to avoid encountering major problems and most importantly, how these queries can be rewritten to run more efficiently.

RubyNation | Washington, DC | June 6, 2014
Slides

Mountain West Ruby | Salt Lake City, UT | March 21, 2014
Video | Slides

Big Ruby | Dallas, TX | February, 2014
Workshop Repo

Podcasts

Remote Ruby Podcast | January 25, 2019
#25: Upgrading GitHub and the Future of Rails

Hanselminutes Podcast | November 8, 2018
#657: Upgrading GitHub and Improving Rails

5by5 Podcast | November 5, 2018
#249: Upgrading GitHub from Rails 3.2 to 5.2

Tech Done Right | March 29, 2017
#007: Software, Open Source, and Rails with Eileen Uchitelle and Andrew Horner

Developer on Fire | January 21, 2016
Episode 092 - Eileen Uchitelle - Facing Fear

The Changelog | May 16, 2015
#154: All Things Ruby with 2015’s Ruby Heroes

The Bike Shed | July 7, 2015
#22: No Capes! (Eileen Uchitelle)

RubyRogues | September 10, 2014
#173: RR ActiveRecord CRUD with Eileen Uchitelle