Frequent Releases & Major Changes

At Vinted, we deploy our code hundreds of times per day into production. While offering a lot of advantages, continuous deployment also introduces its own set of challenges. Release of major changes, like big features or considerable refactorings, is one of them. How to release a sizeable improvement without stopping deploying continuously?

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1. frequent releases
   &
   major changes
   

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2. codingfearlessly.com
   mmozuras
   mmozuras
   

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4. VINTED
   

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5. MAKE SECOND-HAND THE
   FIRST CHOICE WORLDWIDE
   

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7. team evolution
   

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8. everyone together
   BE
   Web
   BE
   BE
   

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9. functional
   BE
   BE
   BE
   BE
   Web
   Web
   iOS
   And
   And
   And
   iOS
   iOS
   backend web mobile
   

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10. cross-functional
    gem yo secret ■pants
    might magic
    

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11. cross-functional
    

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12. people with all skills
    

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13. people with all skills
    

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14. people with all skills
    

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15. backend web design
    iOS android analysis
    

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16. backend web design
    iOS android analysis
    operations
    

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17. teamwork
    

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18. releases
    

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19. releases in the old days
    by another department
    

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21. releases today
    by the team
    

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22. releases today at Vinted
    hundreds per day
    

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23. releases today at Vinted
    hundreds per day
    

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24. +19 -2
    

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25. how to release
    major changes?
    

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26. +2000 -42
    

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27. how to release
    major changes?
    

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28. piece by piece?
    

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29. piece by piece?
    

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30. long release cycles?
    

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31. long release cycles?
    

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32. long-lived branches?
    

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33. long-lived branches?
    

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34. separate release
    from deployment?
    

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35. release
    make feature/code
    available for users
    

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36. deploy
    put feature/code
    in production
    

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37. separate release
    from deployment!
    

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38. science
    &
    feature flags
    &
    ab tests
    

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39. science
    

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42. sphinx -> elasticsearch
    

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43. major
    refactoring
    

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44. trust the tests?
    

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45. trust the tests?
    

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46. run old & new code
    

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47. run old & new code
    log differences
    

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48. run old & new code
    log differences
    remove differences
    

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49. github/scientist
    

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52. duration
    matches
    mismatches
    

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54. sphinx -> elasticsearch
    

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55. feature flags
    

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57. feature
    flags/toggles/switches/flippers
    

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58. glorified if statement
    

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62. just turn it on?
    

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64. ab tests
    

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68. admin
    svc-ab
    svc-1 svc-2 svc-3
    data
    

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69. admin
    svc-ab
    svc-1 svc-2 svc-3
    data
    write ab config
    

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70. admin
    svc-ab
    svc-1 svc-2 svc-3
    data
    read ab config
    

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71. admin
    svc-ab
    svc-1 svc-2 svc-3
    data
    write events
    

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72. admin
    svc-ab
    svc-1 svc-2 svc-3
    data
    

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73. svc-ab
    svc-1 svc-2 svc-3 android iOS
    

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74. vinted/ab
    vinted/ab-ios
    vinted/ab-java
    

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75. release a feature
    to a percentage
    

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76. release a feature
    to half of a city
    

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77. release
    to everyone
    

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79. major changes
    

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80. science
    &
    feature flags
    &
    ab tests
    

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81. separate release
    from deployment
    

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82. thanks!
    mmozuras
    mmozuras
    

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