MTC2018 - Android at Scale

Speaker: Israel Ferrer Camacho

In this talk, Israel Ferrer Camacho will share what are the common pitfalls at developing applications with big teams and big codebases and how to solve them.

Transcript

1. Android at Scale Israel Ferrer Camacho Tech Lead (Android)
3. 100 ENGINEER TEAM
4. DIFFICULT TO MODIFY EASY TO BREAK SLOW DEVELOPMENT
5. Israel Ferrer Camacho Android Tech Lead | @rallat ANDROID @ SCALE
6. QUALITY CONSISTENT REUSABLE
7. QUALITY CONSISTENT REUSABLE
8. WHAT IS QUALITY?
9. QUALITY
10. NO BUGS QUALITY
11. PREVENT BUGS WITH TEST QUALITY
12. MANUAL TEST UI TEST INTEGRATION TEST UNIT TEST QUALITY
13. MANUAL TEST UI TEST INTEGRATION TEST UNIT TEST QUALITY
14. QUALITY Easy to write Easy to maintain Fast to run UNIT TEST
15. Run unit test for each commit Immediate quality feedback! For engineers is a safety net QUALITY UNIT TEST
16. Feature proofs the code for future changes QUALITY UNIT TEST
17. QUALITY CONSISTENT REUSABLE
18. QUALITY CONSISTENT REUSABLE
19. DEFINE PRINCIPLES CONSISTENT
20. PRINCIPLES CAN EVOLVE CONSISTENT
21. CONSISTENT NEW ARCHITECTURE
22. CONSISTENT LAYERED ARCHITECTURE
23. CONSISTENT SINGLE RESPONSIBILITY
24. Data layer View layer Logic layer
25. View layer Data layer Logic layer
26. REUSABLE?
27. BUSINESS LOGIC REUSABLE
28. USE CASES LAYER REUSABLE
29. Use cases View layer Data layer Screen behavior
30. View layer Data layer Sort Items Buy Item Like Item Comment Item Screen behavior
31. Use cases View layer Data layer Screen behavior
32. Use cases View layer Data layer Screen behavior
33. Use cases Screen behavior View layer Data layer QUALITY CONSISTENT REUSABLE
34. HOW TO REUSE CUSTOM VIEWS, COMPONENTS, UTILS?
35. DISCOVERABILITY?
36. HOW CAN 100 ENG WORK IN THE SAME CODEBASE?
37. MONOLITHIC 
 MONOLITHIC TO
 MODULAR REUSABLE
38. 4DSFFO
     4DSFFO
     4DSFFO
     /FUXPSL
     /FUXPSL
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     REUSABLE
39. . 4DSFFO
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40. REUSABLE . 4DSFFO
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     #VUUPO
     "QQ #VUUPO
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     6*$PSF
41. 6*$PSF REUSABLE . 4DSFFO
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42. REUSABLE . 4DSFFO
     4DSFFO
     4DSFFO
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     /FUXPSL
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43. REUSABLE . 4DSFFO
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     /FUXPSL
     /FUXPSL
     "QQ 6*$PSF #VUUPO
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44. REUSABLE . 4DSFFO
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45. REUSABLE . 4DSFFO
     4DSFFO
     4DSFFO
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     /FUXPSL
     /FUXPSL
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    PO
46. REUSABLE . 4DSFFO
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     4DSFFO
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     /FUXPSL
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47. REUSABLE . 4DSFFO
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48. REUSABLE . 4DSFFO
     4DSFFO
     4DSFFO
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49. REUSABLE . 4DSFFO
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     4DSFFO
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50. REUSABLE 4DSFFO
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     4DSFFO
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     #VUUPO
     %FQFOET
    PO /FUXPSL /FUXPSL
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51. REUSABLE 4DSFFO
     4DSFFO
     4DSFFO
     %FQFOET
    PO /FUXPSL /FUXPSL
     /FUXPSL
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52. REUSABLE 4DSFFO
     4DSFFO
     4DSFFO
     %FQFOET
    PO /FUXPSL /FUXPSL
     /FUXPSL
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53. REUSABLE 4DSFFO
     4DSFFO
     4DSFFO
     %FQFOET
    PO /FUXPSL /FUXPSL
     /FUXPSL
     /FUXPSL
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54. REUSABLE 4DSFFO
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     4DSFFO
     %FQFOET
    PO /FUXPSL /FUXPSL
     /FUXPSL
     /FUXPSL
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55. ADVANTAGES MODULAR
56. ADVANTAGES MODULAR Improve reusability Improve discoverability Less code conflicts Faster build time in Gradle
57. MERCARI MODULES
58. REUSABLE Core Network DB Identity Core-java Android Core Util Util-Android UI Model Features Live Offer Payment Search Listing
59. QUALITY CONSISTENT REUSABLE
60. HOW LONG?
61. THIS IS NOT A TEMPORARY PROJECT
62. NOT A SOLO PROJECT
63. LONG LASTING CHANGE ENGINEERING CULTURE
64. FROM CODER
65. FROM CODER TO ENGINEER
66. ENGINEER CODER Writes Code Writes Code Code reviews Best solution for a problem Cares about Performance Cares about Quality Feedback to the Team Feedback to the product
67. HOW?
68. WRITE A PROPOSAL
69. WRITE A PR WITH EXAMPLE
70. COLLABORATIVE WORK
71. WRITE GUIDELINES
72. COLLABORATIVE WORK
73. TRAIN THE TEAM
74. OFFICE HOURS
75. PAIR PROGRAMMING
76. CODE REVIEWS
77. RESULTS
78. NEW ARCHITECTURE QUALITY 100% Adoption in new features
79. 0 5 10 15 20 June July August Sept CODE COVERAGE QUALITY
80. STRONG ENGINEER
81. CREATE BETTER PRODUCTS
82. THANKS! JOIN US! Challenge awaits you!