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Client-Backend Engineering
Fuji, Goro
Cookpad Inc.
Mobile Application Development for Perl Mongers
YAPC::Asia 2014, Tokyo, 2014/8/30
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@__gfx__
• A client-backend engineer
• Working on libraries, environments, and CI
on both Android and iOS apps
• As a CPAN author: Data::Validator, Text::Xslate
• Loving Android Studio and AppCode
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No content
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No content
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The number of monthly users
0M
3.6M
7.2M
10.8M
14.4M
18M
Jul Oct Jan Apr Jul Oct Jan Apr
PC
Smartpohone browsers
Smartpohone apps
Feature phones
Others
44.04 million
ʢAs of April 2014ʣ
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The number of installations
iOS 1,010m Android 990m
ʢAs of April 2014ʣ
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How Mobile
Application
Development Runs
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A long time ago in a
galaxy far, far away…
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Lots of problems
• Communication cost:
• service teams <~> mobile app team
• Different release cycle:
• web: 10/day
• app: 2/month
• The will of installations
• Each user sees a random version of apps
• Continuous integration is really difficult
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How our mobile teams were
• Cookpad started as a web service
• Cookpad mobile apps had followed the web
• Service teams were tend to order the new
features to the mobile app team (web-first)
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Lots of good problems ;)
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Communication Cost
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Before “Mobile First” Era
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Entrusted Development
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After “Mobile First” Era
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There are 20+ engineers on mobile applications
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Service Oriented Development
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Our Adventure Has Just
Begun
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Release Cycle
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Web and Mobile Apps
• Cookpad has a successful workflow:
continuous delivery
• Mobile app development should be successful
with the same way!
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No content
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Defects Rise
No rollbacks
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Differences in Release
Cycle
• Web:
• continuous delivery
• easily rollbacks code on problems
• App:
• frequent release makes users irritated
• no rollbacks; all the versions remain in the
world
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Different release cycle
should make different
workflow
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Branching Model
• Web: github-flow
• Keeps the master branch deployable
• App: git-flow
• Makes a release branch on code freeze
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Pull-Request
Development
• All the changes are merged via pull requests
• Do not commit changes to master directly
• All the pull requests should be reviewed
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The Principle: KISS
!
but not to be too simple
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Continuous Integration
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Release Engineering Tasks
• Kicks the Jenkins job for a release package
• Builds it, lints it, tests it, makes a tag
• Uploads the package to Google Play / AppStore
• Writes recent changes
• Publishes it (in iOS: after Apple reviewing)
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Too Many Tasks in
Releng
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Release Engineering as
Code
• External repositories that build app projects
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• No API on AppStore / iTunes Connect yet
• Monitoring - not yet, but will try
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That’s all.
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We are hiring ;)
• There are a lot of good problems in Cookpad!
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Free Talks: YAPC.fm
• How to test mobile apps?
• How about IDE / programming languages?
• What to learn from the Perl community?