How to keep maintenance projects alive and kicking

1. When code gets older
Tips for keeping maintenance projects alive and kicking
Sven Peters
Ambassador
Atlassian

2. Sven Peters
@svenpet
svenpet.com
Ambassador

3. Experience
my
Disclaimer

4. Nothing has a more profound or long-
lasting negative effect on the productivity
of a software team than a mess. Nothing.
“
“Robert C. Martin

5. green
Field

6. grüne
Wiese
How long does it take?
8 hours
We need it in 6!
OK, I‘ll do it in 4!
no Tests!

9. REWRITE

10. REWRITE

11. WindowsBroken

12. the Engines
Don‘t stop

13. no Plan B
There is
THE SCRUM MASTER
THE DEVELOPER
THE MANAGER

14. readability
improve

15. commentno

16. test
automated

17. Code Change Algorithmby Michael C. Feathers
Legacy
1. Identify Change Points
5. Make Changes and Refactor
2. Find Test Points
3. Break Dependencies
4. Write Tests

18. Clean Code

19. nterface Segregation Principle
pen Closed Principle
iskow Substitution Principle
ingle Responsible Principle
ependency Inversion Principle

20. DRY Don‘t repeat yourself
KISS - Keep it simple, stupid
Favour Composition over InheritanceRoot Cause Analysis
SingleLevelofAbstraction
Seperation of ConcernsYou Ain‘t Gonna Need It

21. Clean Code
Developer
von
Stefan Lieser &
Ralf Westphal
clean-code-developer.de

24. @svenpet
Sven PetersAtlassian