Decomposing a live application with confidence

We always try to avoid the famous Big Mall of Mud™ due to many reasons but what happens when we're already facing it - and making profit with it? Should we just accept our fate and keep fixing bugs for the rest of our lives or should we actually do something different?
In this presentation we'll share the challenges we're facing at Usabilla and how we're using DDD and Kafka to understand and decompose our software into services without having downtime or any impact on our users' experience.

Transcript

1. Luís Cobucci
 @lcobucci confidence Decomposing a live app with https://goo.gl/Nv1sV8
2. Photo by Rafael Dohms Bassano del Grappa !
3. Photo by Rafael Dohms Bassano del Grappa !
4. Live software! Photo by Rafael Dohms Software engineers
5. Luís Cobucci
 @lcobucci https://jobs.usabilla.com
6. Here we go… https://goo.gl/JF1cPb
7. Oh the chaos! https://goo.gl/D4DvKC
8. No tests https://goo.gl/tnbTEC
9. https://goo.gl/hr22Dx Outdated stack
10. https://goo.gl/qh3NNs Complexity
11. Very slow https://goo.gl/dRfUyZ
12. https://goo.gl/cuLYT9 Random bugs
13. Look, light! https://goo.gl/9w9EBV
14. Great people https://goo.gl/JYsTJW
15. Work in progress https://goo.gl/CS6azo
16. Refactor all things! https://goo.gl/ebJsEL
17. Wait, what? https://goo.gl/nTX7xr
18. Sometime ago… https://goo.gl/Zr2mJy
19. https://goo.gl/WdiLjf Big ball of mud
20. Unify everything https://goo.gl/TGmbsc
21. No major rewrite https://goo.gl/SfHtmY PLEASE
22. Strangler application https://goo.gl/9ctdLn
23. The big and scary application
24. The big and scary application Dummy proxy
25. The big and scary application Dummy proxy Nice and shiny!
26. The big and scary application Proxy Nice and shiny! Nice and shiny! Nice and shiny!
27. The big and scary application Proxy Nice and shiny! Nice and shiny! Nice and shiny!
28. Proxy Nice and shiny! Nice and shiny! Nice and shiny! WOW Much strangle So shiny
29. Uuurgh
30. Decomposing things https://goo.gl/YCrvVL
31. “If you are afraid that producing software with thoughtful design is expensive, think how much more expensive it’s going to be to live with it or even fix a bad design.” Vaughn Vernon
32. Hurry up! https://goo.gl/Psv1jN
33. https://goo.gl/62BNwH Domain knowledge
34. Call the experts https://goo.gl/4qKJTp
35. Event storming
36. Context mapping
37. Gherkin stories https://goo.gl/EJi8Xo
38. https://goo.gl/KFjUHT Metrics
39. https://goo.gl/TVBGXQ services Micro
40. https://goo.gl/Nr98Mo Evolvability
41. https://goo.gl/SwL7bh Ship it!
42. https://goo.gl/EtNKra Simplicity
43. https://goo.gl/Sx7TYA Strictness
44. https://goo.gl/Sx7TYA Growth & scale
45. Minions of users! https://goo.gl/7MAkHZ
46. Partitioned Low latency delivery Fast Fault tolerant Scalable
47. Group 1 Brokers Producer 1 Producer 2 Topic Partition 1 Partition 2 Consumer 1 Consumer 2 Streamer A
48. https://goo.gl/45PJ2o Feedback collection
49. Feedback Collection
52. … The big and scary
 application - Channel 5 The big and scary
 application - Channel 0
53. … Feedback Collection The big and scary
 application - Channel 5 The big and scary
 application - Channel 0
54. … Feedback Collection The big and scary
 application - Channel 5 The big and scary
 application - Channel 0
56. Feedback Collection Feedback Consolidation Feedback Processing Topic A Topic B Topic C
57. Lessons https://goo.gl/uDPLPA
58. Constraints https://goo.gl/Nxo8nb
59. Domain exploration https://goo.gl/jyxuVs
60. Communication https://goo.gl/fnG848
61. Discipline https://goo.gl/fnG848
62. Luís Cobucci
 @lcobucci confidence Decomposing a live app with https://goo.gl/Nv1sV8
63. Thanks! @lcobucci