Mobile @ Facebook - QConSF 2013

1. Mobile @ Facebook Christian Legnitto (christianl@fb.com) Mobile release engineering

2. Who is this guy?

3. Who is this guy? Facebook • Manage Mobile Release Engineering • I’m hiring • Run the iOS and Android releases • Ran Facebook.com web pushes for ~3 months

4. Who is this guy? Facebook • Manage Mobile Release Engineering • I’m hiring • Run the iOS and Android releases • Ran Facebook.com web pushes for ~3 months Mozilla • Firefox release manager • Helped design & implement 6 week releases • Desktop ( 3 platforms ) & mobile ( Android ) • Still a community member

5. Who is this guy? Facebook • Manage Mobile Release Engineering • I’m hiring • Run the iOS and Android releases • Ran Facebook.com web pushes for ~3 months Mozilla • Firefox release manager • Helped design & implement 6 week releases • Desktop ( 3 platforms ) & mobile ( Android ) • Still a community member Apple • Jaguar → Lion updates • OS X pre-release updates • Safari, Xcode, Java, iApps • Build system, scrubber, PM tools

7. 874,000,000 MAUs 507,000,000 DAUs

9. iPads & iPhones native & web supports iOS6+

11. native & web +1M beta testers supports Froyo+ 15 apks +20K alpha testers

14. How we USED to develop

15. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker ... ... ... Events team Photos team Android core team iOS core team

16. Doesn’t SCALE

17. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker Events team Photos team Android core team iOS core team

18. Mobile core team owned mobile Desktop Web Events team Photos team Android core team iOS core team Group messages Group messages Group messages Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums 20 iOS Chat Messages team Android Photo albums Photo albums Photo picker Photo picker Photo picker 10 30 20 20

19. Mobile core team owned mobile Desktop Web Photos team Android core team iOS core team (numbers made up) Group messages Group messages Group messages Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Events team 20 iOS Chat Messages team Android Photo picker Photo picker 10 30 20 20

20. Mobile core team owned mobile Desktop Web Events team Photos team Android core team iOS core team Group messages Group messages Group messages Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums 20 iOS Chat Messages team Android Photo albums Photo albums Photo picker Photo picker Photo picker 10 30 20 20

21. Mobile core team owned mobile Desktop Web Photos team Android core team iOS core team Group messages Group messages Chat Events team iOS Group messages Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Messages team Android Photo albums Photo albums Photo picker Photo picker Photo picker 10 30 20 20 20

22. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Messages team Android Photo albums Photo albums Photo picker Photo picker Photo picker Events team Photos team Android core team iOS core team 30 20 20 20 10

23. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Messages team Android Photo albums Photo albums Photo picker Photo picker Photo picker Events team Photos team Android core team iOS core team 20 20 20 60 30 10

24. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Messages team Android Photo albums Photo albums Photo picker Photo picker Photo picker 20 60 30 10 20 Events team Photos team Android core team iOS core team 20

25. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker 20 60 30 10 20 20 Events team Photos team Android core team iOS core team

26. Doesn’t produce the BEST product

27. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker Events team Photos team Android core team iOS core team

28. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker Events team Photos team Android core team iOS core team product experts

29. Mobile core team owned mobile Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker Events team Photos team Android core team iOS core team product experts platform experts

30. How we USED to ship

31. Feature-based releases

32. Feature-based releases Decide on features

33. Feature-based releases Decide on features Furiously work on them

34. Feature-based releases Decide on features Furiously work on them Test

35. Feature-based releases Decide on features Furiously work on them Test Ship when all features are done

36. All features are PRIORITY #1

37. Decide on features Desktop Web Group messages Chat Upcoming events Birthdays Photo albums Photo picker ...

38. Decide on features Desktop Web 1. Emoji 2. Green dot 3. Naming convos Group messages Chat Upcoming events Birthdays Photo albums Photo picker ...

39. Decide on features Desktop Web 1. Emoji 2. Green dot 3. Naming convos Group messages 1. Reply inline 2. Birthday reminder 3. Gifts integration Upcoming events Chat Birthdays Photo albums Photo picker ...

40. Decide on features Desktop Web 1. Emoji 2. Green dot 3. Naming convos Group messages 1. Reply inline 2. Birthday reminder 3. Gifts integration Upcoming events 1. Automatic upload 2. Tag suggestions 3. Change cover photo Chat Birthdays Photo albums Photo picker ...

41. Decide on features Desktop Web Android 1. Emoji 2. Green dot 3. Naming convos Group messages Group messages Chat Chat 1. Reply inline 2. Birthday reminder 3. Gifts integration Upcoming events Upcoming events Birthdays Birthdays Photo albums Photo albums Photo picker Photo picker ... ... 1. Automatic upload 2. Tag suggestions 3. Change cover photo

42. Decide on features Desktop Web Android 1. Emoji 2. Green dot 3. Naming convos Group messages Group messages Chat Chat 1. Reply inline 2. Birthday reminder 3. Gifts integration Upcoming events Upcoming events Birthdays Birthdays Photo albums Photo albums Photo picker Photo picker ... ... 1. Automatic upload 2. Tag suggestions 3. Change cover photo 1. Emoji 1. Reply inline 1. Automatic upload

43. Decide on features Desktop Web Android 1. Emoji 2. Green dot 3. Naming convos Group messages Group messages Chat Chat 1. Reply inline 2. Birthday reminder 3. Gifts integration Upcoming events Upcoming events Birthdays Birthdays Photo albums Photo albums Photo picker Photo picker ... ... 1. Automatic upload 2. Tag suggestions 3. Change cover photo 1. Emoji 1. Reply inline 1. Automatic upload 2. Green dot 2. Birthday reminder 2. Tag suggestions

44. Decide on features Desktop Web Android 1. Emoji 2. Green dot 3. Naming convos Group messages Group messages Chat Chat 1. Reply inline 2. Birthday reminder 3. Gifts integration Upcoming events Upcoming events Birthdays Birthdays Photo albums Photo albums Photo picker Photo picker ... ... 1. Automatic upload 2. Tag suggestions 3. Change cover photo 1. Emoji 1. Reply inline 1. Automatic upload 2. Green dot 2. Birthday reminder 2. Tag suggestions 3. Naming convos 3. Gifts integration 3. Change cover photo

45. The market and company CHANGES RAPIDLY

46. Decide on features Android Group messages Chat Upcoming events Birthdays Photo albums Photo picker ... 1. Emoji 2. Reply inline 3. Automatic upload 4. Green dot 5. Birthday reminder 6. Tag suggestions 7. Naming convos 8. Gifts integration 9. Change cover photo

55. Don’t know when code SHIPS

56. Feature-based releases Can’t judge risk vs reward

57. Feature-based releases Can’t judge risk vs reward 80% done?

58. Feature-based releases Can’t judge risk vs reward 80% done? Good enough

59. Confuses DEV and RELEASE

60. Development process Create the best product possible → Focus on improving

61. Development process Create the best product possible → Focus on improving Release process Ship ﬁnished work in a timely manner → Focus on not regressing

62. Took lessons learned from DESKTOP WEB and applied them to MOBILE

63. How we develop NOW

64. Old and busted Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker ... ... ... Events team Photos team Android core team iOS core team

65. New hotness Desktop Web iOS Group messages Group messages Group messages Chat Messages team Android Chat Chat Upcoming events Upcoming events Upcoming events Birthdays Birthdays Birthdays Photo albums Photo albums Photo albums Photo picker Photo picker Photo picker ... ... ... Events team Photos team Android core team iOS core team

66. Engineers committing mobile code iOS and Android

67. How we ship NOW

68. features quality schedule

69. features quality schedule pick 2

70. features quality schedule pick 2

71. Date-based releases Rule #1 We ship on time

72. Date-based releases Rule #2 Make users no worse off

73. Date-based releases Rule #3 There’s always the next one

74. Date-based releases Rule #4 Retreat to safety

75. tiv na Automated cut every 4 weeks e m ile ob 4 weeks of development 4 weeks of development master 3.5 weeks of stabilization release branch RC

76. p to sk de Automated cut every 1 week w eb 1 week of development 1 week of development trunk Stabilize Release branch release branch Weekly Twice Daily

77. tiv na Automated cut every 4 weeks e m ile ob 4 weeks of development 4 weeks of development master 3.5 weeks of stabilization release branch RC

78. tiv na Dogfooding e m ile ob master release branch

79. How we write CODE

80. Source control Git >100,000 commits >150,000 ﬁles >300 engineers

81. Code review Phabricator

83. Continuous integration Buildbot Builds Lint / static analysis Tests Facebook i386 Facebook arm Messenger i386 Messenger arm ... regex clang android ﬁndbugs ... OCUnit snapshot JUnit robolectric ... https://github.com/facebook/ios-snapshot-test-case

84. Continuous integration Buildbot Before diff Create diff (optional) (mandatory) Diff updated Landing queue (mandatory) (optional) Git commit (mandatory)

85. Continuous integration Mac minis

86. Android

87. Building & running tests Buck - build tool • • • • Fast • Distributed Cassandra build cache • buckd for background builds Scalable and extensible “buck clean is a bug” Android and generic Java support

88. Building & running tests Buck - build tool • • • • Fast • Distributed Cassandra build cache • buckd for background builds Scalable and extensible “buck clean is a bug” Android and generic Java support

89. Building & running tests Buck - build tool “Gerrit Code Review recently switched its build process from Maven to Buck, reducing build time by 67-98% while improving build reproducibility, maintainability and developer happiness. The Gerrit project migrated itself out of the Maven tarpit into a ” better build. - Shawn Pearce (Google)

90. Building & running tests Buck - join us! Start using Buck: http://facebook.github.io/buck/ Get help in the discussion group: https://groups.google.com/forum/#!forum/buck-build File bugs and submit patches on GitHub: https://github.com/facebook/buck

91. iOS

92. Building & running tests xctool - build tool Makes iOS & Mac continuous integration easier. • CLI tool, runs tests just as Xcode.app would • Can parallelize test runs • Can emit JSON objects for every build/test event • Reporters for Phabricator, JUnit XML • Attractive, concise output

93. Building & running tests xctool - “pretty” reporter

94. Building & running tests xctool - “json-stream” reporter

95. Building & running tests xctool - how it works xctool xcodebuild xcodebuild-shim.dylib Injected otest (SenTestingKit) xctest (XCTest) test-shim.dylib Injected test-shim.dylib Injected

96. Building & running tests xctool - join us! On GitHub: github.com/facebook/xctool On Homebrew: brew install xctool Also available on Travis-CI

97. Crash reports atos

98. Crash reports atosl

99. Crash reports atosl github.com/facebook/atosl

100. Changed how we DEVELOP Changed how we SHIP Changed how we WRITE CODE Kept our CULTURE

101. Facebook is mobile Learn from our experience and use our tools

102. Links to mentioned awesomeness Contact me Buck christianl@fb.com, https://fb.me/legnitto, @LegNeato http://github.com/facebook/buck XCTool http://github.com/facebook/xctool atosl http://github.com/facebook/atosl Snapshot Test http://github.com/facebook/ios-snapshot-test-case

103. Mobile @ Facebook Christian Legnitto (christianl@fb.com) Mobile release engineering

Mobile @ Facebook - QConSF 2013

Mobile @ Facebook - QConSF 2013

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