November 26, 2014

Hector Zarate Rea (@iOSCowboy)

From Plan to Done (iOS Client)

Spotify in Numbers

Over 50 million active users.

Over 30 million songs.

20,000 songs added per day.

Over 1.5 billion playlists created so far.

Available in 58 markets

Our iOS Client in Numbers

40 Contributors each month

Millions User Base

500,000 Lines of code

Repository Contributors in Numbers

0

12.5

25

37.5

50

S C A L E

P R O B L E M S

PROBLEM 1: Feature Branches

master

Feature Branches

master

Feature Branches

feature_a

master

Feature Branches

feature_a

feature_b

master

Feature Branches

feature_a

feature_b

feature_c

master

Feature Branches

feature_a

feature_b

feature_c

x

x

Branches Merged Back Into Master

70%

30%

SOLUTION 1: AB Rollout

master

SOLUTION 1: AB Rollout

master (feature_a, feature_b, feature-c)

SOLUTION 1: AB Rollout

A B

SOLUTION 1: AB Rollout

A B

Branches Merged Back Into Master10%

90%

PROBLEM 2: Merge Conflicts (Lots of em)

Spotify.xcodeproj

PROBLEM 2: Merge Conflicts (Lots of em)

PROBLEM 2: Merge Conflicts (Lots of em)

+x x

PROBLEM 2: Merge Conflicts (Lots of em)

Spotify.xcodeproj

PROBLEM 2: Merge Conflicts (Lots of em)

Radio Browse Social

DiscoverMusic Player X

GAME STRATEGY

1. Agile - Flavored Process

Plan Work Done

1. Agile - Flavored Process

Plan Work Done

2. Version Control

2. Version Control

3. Code Reviews

3. Code Reviews

_

3. Code Reviews

_ _

3. Code Reviews

_

3. Code Reviews

3. Code Reviews

Spread Knowledge.

Prevent work from being repeated.

Opportunity to detect errors earlier.

feature

feature

3. Continuos Integration

3. Continuos Integration

Eases integration issues.

Gives automatic notification of build and test errors and prints stats like code coverage.

Gives clues of where and when things went wrong to everybody.

Executes tests suites

4. Unit Tests

1 2 3 4

4. Unit Tests

1 2 3 4 5

4. Unit Tests

1 2 3 4 5 6

4. Unit Tests

Used mainly to test model and model-view layers of the client.

First channel of feedback to avoid regressions.

Can be executed on the developer machine as well.

5. Automated Tests

5. Automated Tests

5. Automated Tests

Used mainly to test the view layer and user interfaces of the app.

Executed on all supported devices.

master

6. Log Crashes

November 26, 2014

Questions!

November 26, 2014

Thank you!

November 26, 2014

Keep in touch

hector@spotify.com

@iOSCowboy

iOSCowboy.com