Talk given at Build IT Right 2020 (12th November 2020)

1. PREREQUISITES FOR
PREREQUISITES FOR
EVOLUTIONARY
EVOLUTIONARY
ARCHITECTURE
ARCHITECTURE
CHRIS HOWE-JONES
CHRIS HOWE-JONES
12TH NOVEMBER 2020
12TH NOVEMBER 2020

2. WHO AM I?
WHO AM I?
Name: Chris Howe-Jones [Technical Navigator]
Twitter: @agile_geek
Github: https://github.com/chrishowejones
Website: https://www.devcycle.co.uk

3. WHY EVOLUTIONARY ARCHITECTURE?
WHY EVOLUTIONARY ARCHITECTURE?
The only constant is change!

4. WHY EVOLUTIONARY ARCHITECTURE?
WHY EVOLUTIONARY ARCHITECTURE?
The only constant is change!
What is change?

5. WHY EVOLUTIONARY ARCHITECTURE?
WHY EVOLUTIONARY ARCHITECTURE?
The only constant is change!
What is change?
"the process of replacing something with
something new or different; a thing that is
used to replace something"

6. WHY EVOLUTIONARY ARCHITECTURE?
WHY EVOLUTIONARY ARCHITECTURE?
The only constant is change!
What is change?
What is evolution?
"the process of replacing something with
something new or different; a thing that is
used to replace something"

7. WHY EVOLUTIONARY ARCHITECTURE?
WHY EVOLUTIONARY ARCHITECTURE?
The only constant is change!
What is change?
What is evolution?
"the process of replacing something with
something new or different; a thing that is
used to replace something"
"the gradual development of something."

8. WHY EVOLVE?
WHY EVOLVE?

9. KEY CHARACTERISTICS OF EVOLUTION
KEY CHARACTERISTICS OF EVOLUTION
Adaptation

10. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION

11. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
New generations.

12. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
New generations.
Feedback.

13. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
New generations.
Feedback.
Room to fail (adaptations that do not survive).

14. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION

15. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
Short cycles between generations.

16. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
Short cycles between generations.
Ability to fallback to earlier successful generations.

17. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
Short cycles between generations.
Ability to fallback to earlier successful generations.
Reactive to ecosystem

18. MECHANISMS OF ADAPTATION
MECHANISMS OF ADAPTATION
Short cycles between generations.
Ability to fallback to earlier successful generations.
Reactive to ecosystem
Impact on ecosystem

19. TRANSLATED TO SOFTWARE
TRANSLATED TO SOFTWARE

20. TRANSLATED TO SOFTWARE
TRANSLATED TO SOFTWARE
Separate deployment from release.

21. TRANSLATED TO SOFTWARE
TRANSLATED TO SOFTWARE
Separate deployment from release.
Fast feedback
In development
In production

22. TRANSLATED TO SOFTWARE
TRANSLATED TO SOFTWARE
Separate deployment from release.
Fast feedback
In development
In production
Appropriate feedback
Metrics for architecturally important aspects

23. TRANSLATED TO SOFTWARE
TRANSLATED TO SOFTWARE
Separate deployment from release.
Fast feedback
In development
In production
Appropriate feedback
Metrics for architecturally important aspects
Responsive culture

24. PICK YOUR CONSTRAINTS
PICK YOUR CONSTRAINTS

25. MATERIALS MATTER
MATERIALS MATTER

26. MATERIALS MATTER
MATERIALS MATTER

27. MATERIALS MATTER
MATERIALS MATTER

28. MATERIALS MATTER
MATERIALS MATTER

29. MATERIALS MATTER
MATERIALS MATTER

30. MATERIALS MATTER
MATERIALS MATTER
Because the constraints they introduce direct behaviour

31. SEPARATE RELEASE FROM DEPLOYMENT
SEPARATE RELEASE FROM DEPLOYMENT

32. FEEDBACK
FEEDBACK
Data (Hypothesis) Driven Development

33. FEEDBACK BETWEEN ECOSYSTEMS
FEEDBACK BETWEEN ECOSYSTEMS

34. FEEDBACK IN MICRO-ECOSYSTEM
FEEDBACK IN MICRO-ECOSYSTEM

35. FEEDBACK IN BIOTOPE
FEEDBACK IN BIOTOPE

36. FEEDBACK IN BIOME
FEEDBACK IN BIOME

37. FEEDBACK IN BIOSPHERE
FEEDBACK IN BIOSPHERE

38. TL;DR
TL;DR
Separate Release from Deployment

39. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]

40. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]

41. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]

42. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]
Branch by abstraction [Implementation]

43. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]
Branch by abstraction [Implementation]
CI [Implementation]

44. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]
Branch by abstraction [Implementation]
CI [Implementation]
CD [Implementation]

45. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]
Branch by abstraction [Implementation]
CI [Implementation]
CD [Implementation]
Immutable servers [Implementation]

46. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]
Branch by abstraction [Implementation]
CI [Implementation]
CD [Implementation]
Immutable servers [Implementation]
Dark/Canary/Blue-Green deployments [Implementation]

47. TL;DR
TL;DR
Separate Release from Deployment
DDD - contexts, aggregates [Discovery]
Event storming [Discovery]
Feature toggling [Implementation]
Branch by abstraction [Implementation]
CI [Implementation]
CD [Implementation]
Immutable servers [Implementation]
Dark/Canary/Blue-Green deployments [Implementation]
Schema on Read DBs [Implementation]

48. TL;DR
TL;DR
Feedback

49. TL;DR
TL;DR
Feedback
Automated testing

50. TL;DR
TL;DR
Feedback
Automated testing
CI

51. TL;DR
TL;DR
Feedback
Automated testing
CI
CD

52. TL;DR
TL;DR
Feedback
Automated testing
CI
CD
Automated Observability (alerting, logging, monitoring,
etc)

53. TL;DR
TL;DR
Feedback
Automated testing
CI
CD
Automated Observability (alerting, logging, monitoring,
etc)
Metrics at all levels

54. TL;DR
TL;DR
Feedback
Automated testing
CI
CD
Automated Observability (alerting, logging, monitoring,
etc)
Metrics at all levels
Visualisation of work ows

55. TL;DR
TL;DR
Feedback
Automated testing
CI
CD
Automated Observability (alerting, logging, monitoring,
etc)
Metrics at all levels
Visualisation of work ows
Retrospectives

56. TL;DR
TL;DR
Culture

57. TL;DR
TL;DR
Culture
Pick your constraints (Materials matter)

58. TL;DR
TL;DR
Culture
Pick your constraints (Materials matter)
Stay small for as long as possible

59. TL;DR
TL;DR
Culture
Pick your constraints (Materials matter)
Stay small for as long as possible
Recognise that software is core to most orgs

60. TL;DR
TL;DR
Culture
Pick your constraints (Materials matter)
Stay small for as long as possible
Recognise that software is core to most orgs
Defer design decisions

61. TL;DR
TL;DR
Culture
Pick your constraints (Materials matter)
Stay small for as long as possible
Recognise that software is core to most orgs
Defer design decisions
Simplify (not same as easy!)

62. TL;DR
TL;DR
Culture
Pick your constraints (Materials matter)
Stay small for as long as possible
Recognise that software is core to most orgs
Defer design decisions
Simplify (not same as easy!)
Architecture is a social & group process