The document outlines recent growth and improvements of the Stack Exchange network, including a 15% increase in sites and a rise in visitor rank. It discusses the development workflow, emphasizing the importance of quick iterations and feature deployments, as well as addressing technical challenges such as caching and dependency injection. Key takeaways highlight the necessity of performance and adaptability in the development process.

1. Marco Cecconi
@sklivvz
http://sklivvz.com

2. ARCHITECTURE?
WHAT THE HECK IS
THAT?

5. In the past 12 months
• The Stack Exchange network grew from 130 to
150 sites (+15%)
• US site rank for visitors of the whole network
improved from #44 to #19 (-25 ranks)

23. Tight, tight, code cycles

24. BATCAVE
Code-build-test cycle
running on home machine
feature requests

25. BATCAVE DEV.SO
Test on the real servers
git push

26. BATCAVE DEV.SO
META.SE
1-click deploy
Users test on
meta.stackexchange.com
(“baking”)
git push

27. BATCAVE DEV.SO
META.SE
1-click deploy
HALP!
git revert
git push

28. BATCAVE DEV.SO
NETWORK META.SE
1-click deploy
git push
1-click
deploy
It’s live! Tons of users use it…

29. BATCAVE DEV.SO
NETWORK META.SE
1-click deploy
git push
1-click
deploy
…and
provide new
feature requests

30. Move fast and break things*
* Not the home page or question page :-)

31. Move fast and break things*
* Not the home page or question page :-)

33. “Normal” caching

36. Our frienemy:
The Garbage Collector

38. Too many objects instantiated

39. Caching abuse

44. Compliler abuse

47. Framework abuse

51. Complex instance
graph

52. Avoiding common patterns

53. IRepository<Order> orderRepository =
container.Resolve<IRepository<Order>>();
Order order = orderRepository.Get(35);
Dependency injection pattern

55. IRepository<Order> repository =
new ValidatingOrderRepository (
new SecurityRepository<Order> (
new LoggingRepository<Order> (
new CachingRepository<Order> (
new NHibernateRepository<Order> ()
)
)
)
);
Order order = repository.Get(35);

56. A look at our source code

61. Automated TESTERS

64. What we do test:
Open Source and Libraries

70. BOSS MODE CODE

71. BOSS MODE TOOLS

72. • Performance is a feature
• Always. Be. Shipping.
• Use your circumstances.
• Open source your libraries
• 3 obscenely big monitors.
KEY TAKEAWAYS

74. Marco Cecconi
@sklivvz
http://sklivvz.com
perl -wlne'BEGIN{$b=rand$=}$a=qw/To
lzhk_kypam_yr_qryaimtcpdjmu_bmr_amk_enq_ghqhmf
Cnvm/[($_<=>int$b)+1];$a=~y/a-zA-Z/b-zaB-ZA/;print $a'