Lookout iOS developer Stephanie Shupe presented at the Grace Hopper Celebration of Women in Computing on October 10, 2014. She explains the processes that Lookout has used to successfully scale its mobile app.

1. Scaling Mobile
Development
Stephanie Shupe
@steph_shupe
Software Engineer, Lookout
October 10, 2014
2014
#GHC14
2014

2. Development Team Evolution
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3. Development Team Evolution
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4. Development Team Evolution
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5. Development Team Evolution
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6. Development Team Evolution
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7. Outline
§ Lookout Case Study
§ Tools to scale mobile development
§ Key Recommendations
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8. Lookout iOS App Case Study
§ New Product ~2011
§ Team grew from 1 to 6 developers
§ Processes developed as team grew in size
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9. Lookout iOS App Versions
2014
3
2.5
2
1.5
1
0.5
0

10. App Versions v. Developers
2014
7
6
5
4
3
2
1
0
Sep-11 Jun-12 Mar-13 Dec-13 Sep-14
iOS App Version Developers

11. App Versions v. Developers
2014
7
6
5
4
3
2
1
0
Sep-11 Jun-12 Mar-13 Dec-13 Sep-14
iOS App Version Developers

12. Tools for any size team
Process / Tool 1 dev 2-4 devs 5+ devs
Version Control l l l
Planning Tool m m l
Unit Testing l l l
Code Review Tool m l
Integration Testing m l
Automated UI Testing m m l
Continuous Integration m l
Localization Tool m
Code Style Guideline l
Release Process l
2014

13. Workflow
2014
New
Task
Write
Code
• Write
Tests
• Localize*
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

14. Workflow
2014
New
Task
Write
Code
• Localize*
• Write
Tests
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

15. Planning Tool
2014
§ Lightweight
− Whiteboard
− To-Do Lists
§ Heavyweight
− Task Managing Software / Website

16. Planning Tool
https://www.atlassian.com/software/jira
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17. Planning Tool
2014

18. Workflow
2014
New
Task
Write
Code
• Write
Tests
• Localize*
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

19. Writing Code…
My project
no longer
compiles?!
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20. Version Control
git-scm.com github.com
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21. Version Control
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github.com

22. Writing Code…
What’s the
style?
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23. Code Style Guideline
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24. Writing Code…
Wir haben
andere
Sprachen?
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25. Localization Management
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§ Lightweight
− Email strings files back and forth
§ Heavyweight
− Localization Tool

26. Localization Tool
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27. Localization Tool
§ Command line tool
§ Graphical interface for translators
§ Cross-project translation database
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28. Writing Code…
Something
is broken,
but I don’t
know why!
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29. Unit Testing
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describe(@"+isExpired:",
^{
context(@"when
date
occurred
in
past",
^{
beforeEach(^{
subject
=
[NSDate
dateWithTimeIntervalSinceNow:-­‐10];
});
it(@"should
return
expired",
^{
[[theValue([NSDate
isExpired:subject])
should]
beYes];
});
});
context(@"when
date
occurs
in
future",
^{
beforeEach(^{
subject
=
[NSDate
dateWithTimeIntervalSinceNow:1000000];
});
it(@"should
return
not
expired",
^{
[[theValue([NSDate
isExpired:subject])
should]
beNo];
});
});
});

30. Integration Testing
context(@"when
a
request
is
made
with
malformed
data",
^{
it(@"should
return
an
error",
^AsyncBlock
{
Request
*request
=
[Request
new];
2014
...
expect(error).toNot.beNil();
expect(httpResponse.statusCode).to.equal(500);
[client
enqueueRequest:request];
});
});

31. Automated User Interface Testing
§ Automates Manual Tests
§ Test the same app you submit to the
marketplace
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32. Automated User Interface Testing
Run Tests
Generate
Screen shots
Linguistic
Verification
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Quality
Assurance

33. Automated User Interface Testing
§ Open Source
§ Interacts with UI Elements
§ Tests can be written in Ruby, Java, ObjC
2014
https://saucelabs.com/appium

34. 2014

35. Automated User Interface Testing
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Language
English
Japanese
Russian
German
Spanish
French
Device Resolution (px)
480x320
960x640
1024x768
1136x640
1334x750
1920x1080
2048x1536
OS Version
iOS 6
iOS 7
iOS 8

36. Automated User Interface Testing
6 languages
x
7 supported device resolutions
x
3 supported OS Versions
126 Combinations
2014

37. iOS App Crashes v. Automated Tests
2014

38. Workflow
2014
New
Task
Write
Code
• Write
Tests
• Localize*
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

39. Verifying Code
2014
§ Lightweight
− Manually compile project
− Manually run tests
− Minimal Continuous Integration
§ Heavyweight
− Continuous Integration

40. Continuous Integration
− pre- or post- code check in
§ Run test suites
§ Report back status
§ Code Review plugin support
2014
§ Build project
http://jenkins-ci.org/

41. Continuous Integration
2014
http://jenkins-ci.org/

42. Workflow
2014
New
Task
Write
Code
• Write
Tests
• Localize*
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

43. Reviewing Code…
How do I
know that
this code is
any good?
2014

44. Code Review Tool
https://code.google.com/p/gerrit/
2014

45. Code Review Tool
Push
Code • git push gerrit HEAD:refs/publish/master
Gerrit • Kick off Jenkins Build*
• Code review interface
Jenkins
2014
• Task number?
• Project builds?
• Tests pass?

46. Workflow
2014
New
Task
Write
Code
• Write
Tests
• Localize*
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

47. Committing Code…
I’ve
committed,
so I’m done.
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48. Workflow
2014
New
Task
Write
Code
• Write
Tests
• Localize*
Verify
Code
• Build
Project
• Run Tests
Peer
Review
Commit
Code
Release
to Market
• Quality
Assurance

49. Releasing Code…
There isn’t
a magical
‘Release’
button?
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50. Release Process
2014

51. Tools for any size team
Process / Tool 1 dev 2-4 devs 5+ devs
Version Control l l l
Planning Tool m m l
Unit Testing l l l
Code Review Tool m l
Integration Testing m l
Automated UI Testing m m l
Continuous Integration m l
Localization Tool m
Code Style Guideline l
Release Process l
2014

52. Lookout’s Mobile Dev Toolbelt
Process / Tool What Lookout Uses
Version Control Git
Planning Tool JIRA
Unit Testing JUnit, Kiwi
Code Review Tool Gerrit
Integration Testing Robotium, Specta
Automated User Interface Testing Appium
Continuous Integration Jenkins
Localization Tool Web Translate It (WTI)
Code Style Guideline Google / Apple code style guidelines
Release Process Wiki documents
2014

53. Additional tools to consider
§ Code coverage
§ Code guideline enforcement
§ Automated releases
§ Automated builder setup
§ Crash tooling
§ Error logging
§ Agile Processes
§ Performance testing
§ Code Modularization
§ Dependency Manager
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54. Got Feedback?
Rate and Review the session using the
GHC Mobile App
To download visit www.gracehopper.org
2014