At HouseTrip there is a good team culture, and this has allowed us to tackle one of the most tricky things that a developer can face: legacy.

1. LEGACY
Dragos Miron
@dragosmiron
@capze

2. LEGACY
WON’T BE
THE END OF US
Dragos Miron
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3. LEGACY
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4. LEGACY
CAN MAKE US
BETTER DEVELOPERS
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5. Dragos Miron
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6. Dragos Miron
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7. Dragos Miron
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8. WHAT IS LEGACY
FOR YOU?
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9. Dragos Miron
@dragosmiron
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10. RUBY 1.8
RAILS 2
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11. NO!
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12. Legacy
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13. RAILS 3
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14. .9
1
BY
U
R
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RAILS 3

15. RAILS 3
.9
1
BY
U
R
els
od
gM
Lon
les
du
mo
10
ith
w
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@dragosmiron
@capze

16. Your MONGO version
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17. Your MONGO version
MONOLITH App
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18. Your MONGO version
MONOLITH App
BAD SQL QUERIES
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@dragosmiron
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19. Dragos Miron
@dragosmiron
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20. A story of
Dragos Miron
@dragosmiron
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21. at
ry
to
es
th
Dragos Miron
@dragosmiron
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22. Dragos Miron
@dragosmiron
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23. One day…
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@dragosmiron
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24. Dragos Miron
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25. Dragos Miron
@dragosmiron
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26. Dragos Miron
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27. Dragos Miron
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28. A TURN FOR THE GOOD
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29. HARD PROBLEMS
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30. HARD PROBLEMS
BETTER
SOFTWARE ENGINEERS
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@dragosmiron
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31. UL
CEF
UR
ESO
R
M
A
E
T
Dragos Miron
@dragosmiron
@capze

32. UL
CEF
UR
ESO
R
M
A
E
T
Dragos Miron
@dragosmiron
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33. HOW DID WE
TACKLE the LEGACY
?
Dragos Miron
@dragosmiron
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34. Os
PR
UR
O
Dragos Miron
@dragosmiron
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35. Os
PR
UR
O
NG the APP
PI
IP
R
INTO SERVICES
Dragos Miron
@dragosmiron
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36. Os
PR
UR
O
QUERY Optimisation
Dragos Miron
@dragosmiron
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37. Os
PR
UR
O
QUERY Optimisation
use specific INDICES
get rid of FILESORT
Dragos Miron
@dragosmiron
@capze

38. Os
PR
UR
O
QUERY Optimisation
use specific INDICES
get rid of FILESORT
Dragos Miron
@dragosmiron
@capze

39. Os
PR
UR
O
Dragos Miron
@dragosmiron
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DATA TIERING
REPLICATION

40. Os
PR
UR
O
We built OUR OWN
CI cluster
Dragos Miron
@dragosmiron
@capze

41. Os
PR
UR
O
TECH FRIDAYS
We handle more
LEGACY
Dragos Miron
@dragosmiron
@capze

42. Os
PR
UR
O
ruby 1.8 -> ruby 1.9
rails 2 -> rails 3
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@dragosmiron
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43. RECA
SOA
DB Opt.
Tech Fridays
Old tech. migration
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@dragosmiron
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P

44. M
A
E
T
RE
TU
UL
C
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45. Pull Requests
Freedom of speech
Collaborative participation
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@dragosmiron
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46. at
ry
to
es
Th
Dragos Miron
@dragosmiron
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47. RUBY might die…
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@dragosmiron
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48. RUBY might die…
TRAIN as
a software
CRAFTSMAN
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@dragosmiron
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49. TURN THE
WHEEL around
in YOUR FAVOUR
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@dragosmiron
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50. Legacy can make you
contribute to OpenSource
help your fellow devs
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@dragosmiron
@capze

51. TAND
KE A S
TA
MPANY
OUR CO
IN Y
Dragos Miron
@dragosmiron
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52. of
ON
TI
EC
IR
eD
th
te
ta
dic
RE
E
A
W
TW
OF
eS
th
Dragos Miron
@dragosmiron
@capze

53. TOMORRO
W
Leave a CLEANER
CODEBASE
Dragos Miron
@dragosmiron
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54. RT
TA
S
g!
in
or
ct
fa
Re
Dragos Miron
@dragosmiron
@capze
TOMORRO
W

55. Legacy
Dragos Miron
@dragosmiron
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56. Dragos Miron
@dragosmiron
@capze
Great SOFTWARE

57. thank you!
Dragos Miron
@dragosmiron
@capze