Retrospective – Global Day of Coderetreat, Beijing!

On the 3rd of December a small collection of developers gathered in a basement conference room in Beijing to practice the craft of software development. The participants came from diverse backgrounds: architects, developers, students, and managers. There were people comfortable with C++, C#, Java, Python and others hadn’t programmed in a couple of years. Here are my notes from the day:


Coderetreat is a day-long, intensive practice event, focusing on the fundamentals of software development and design. By providing developers the opportunity to take part in focused practice, away from the pressures of ‘getting things done’, the coderetreat format has proven itself to be a highly effective means of skill improvement. Practicing the basic principles of modular and object-oriented design, developers can improve their ability to write code that minimizes the cost of change over time.

A coderetreat is a language-agnostic event. In each session, the pair chooses what language they want to work in. The day focuses on practicing the fundamentals of software: TDD and the 4 rules of simple design; these are applicable regardless of language.

Alex and Zilong pairing

Chocs Away!

After a brief introduction, we went into the first session to familiarize ourselves with the task: Conway’s Game of Life. Participants struggled with deleting the code at the end of the session; this was one of the biggest challenges that they faced throughout the day. The second session was to swap pairs and have a second go at the problem with a clean slate. The third session introduced the concept of ping-pong TDD.

Gospers Glider Gun

For lunch we went out to a local restaurant to get a chance to stretch our legs and have a fresh perspective.



In the afternoon we tried a couple of CyberDojos. The first session we didn’t change pairs so we could have a chance to get familiar with the CyberDojo software. After a few technical issues we were on our way. In the second session we changed the pairs every five minutes, really challenging ourselves to write code in very small increments.



The final session I gave the participants a choice: we could agree as a group to either try to create the absolute best code we could for the solution, or we could try to create the absolute worst code possible that implements the solution. It was a tough call but the dirty code challenge won out. In this session there were many creative approaches and a notable visual implementation that looked great in the UI and was a hornets nest in the implementation – you know who you are! ☺

At the end of the day we held the usual Closing Circle, where we each share with the group our feelings on what went well, what was surprising, and what we can take away from the event. There was a general consensus that the day was fun and that it highlighted the importance of communication, both between people and through the code. Also surprising was how many different approaches there were to the same problem.


Hello from Japan!

Hello from Japan!

The event is called a “Global Day” for a reason; the same event was happening in over 90 cities across the world on the same day. There were many ways the events connected, lots of activity on twitter with the hashtag #gdcr11, and several events talked to each other via google hangouts or skype. We had a quick chat with the coderetreat in Tokyo in the morning, and before lunch we managed a chat with the folks in Perth, Australia. This was a lot of fun and helped to energise the group.

Hello from Perth!

Hello from Perth!

Thanks to Corey Haines and Jim Hurne for organizing the global day, and also thanks everyone that helped me organize in Beijing. Thanks to Tokyo and thanks to Perth. And special thanks to everyone in Beijing who came along on a blue sky day to spend their Saturday in a basement coding with other software craftspeople.

p.s. I am starting a local software craftsmanship meetup group here in Beijing, sign up to hear about future events and meetings!

Related Posts:
Interview with Corey Haines

Tags: software testing craftsmanship coderetreat coreyhaines tdd

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