Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Fight Code Rot Using Continuous Improvement
Search
garyfleming
August 22, 2019
Programming
0
780
Fight Code Rot Using Continuous Improvement
garyfleming
August 22, 2019
Tweet
Share
More Decks by garyfleming
See All by garyfleming
User Story Mapping Workshop
garyfleming
1
44
TDD for Testers
garyfleming
1
100
TDD Is My Shame
garyfleming
0
290
Continuous Testing
garyfleming
0
82
Better User Stories Through Example Mapping
garyfleming
0
94
Fighting Continuous Entropy
garyfleming
0
88
beyond-frameworks.pdf
garyfleming
1
36
The Board Whisperer
garyfleming
0
1.1k
APIs on the Scale of Decades
garyfleming
0
110
Other Decks in Programming
See All in Programming
Langfuseと歩む生成AI活用推進
licux
3
310
ライブ配信サービスの インフラのジレンマ -マルチクラウドに至ったワケ-
mirrativ
2
270
Laravel Boost 超入門
fire_arlo
1
140
『リコリス・リコイル』に学ぶ!! 〜キャリア戦略における計画的偶発性理論と変わる勇気の重要性〜
wanko_it
1
600
Rancher と Terraform
fufuhu
1
120
コーディングエージェント時代のNeovim
key60228
1
110
「リーダーは意思決定する人」って本当?~ 学びを現場で活かす、リーダー4ヶ月目の試行錯誤 ~
marina1017
0
250
Honoアップデート 2025年夏
yusukebe
1
870
モバイルアプリからWebへの横展開を加速した話_Claude_Code_実践術.pdf
kazuyasakamoto
0
280
旅行プランAIエージェント開発の裏側
ippo012
0
240
CSC305 Summer Lecture 12
javiergs
PRO
0
130
Nuances on Kubernetes - RubyConf Taiwan 2025
envek
0
200
Featured
See All Featured
Typedesign – Prime Four
hannesfritz
42
2.8k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
How to Think Like a Performance Engineer
csswizardry
25
1.8k
The Language of Interfaces
destraynor
160
25k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
1k
Fireside Chat
paigeccino
39
3.6k
Done Done
chrislema
185
16k
GraphQLとの向き合い方2022年版
quramy
49
14k
Navigating Team Friction
lara
189
15k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
8
480
Balancing Empowerment & Direction
lara
2
590
Into the Great Unknown - MozCon
thekraken
40
2k
Transcript
FIGHTING CODE ROT USING CONTINUOUS IMPROVEMENT 1995 @garyfleming
1995 @garyfleming
1995 @garyfleming
1995 @garyfleming
1995 @garyfleming
! @garyfleming
NOVEMBER FIFTEEN, NINETEEN NINETY-FIVE @garyfleming
SIXTEEN => SOXTEEN @garyfleming
SIXTEEN => SOXTEEN @garyfleming
TWO THOUSAND SOXTEEN @garyfleming
▸ No source code (written in an older language) ▸
Runs in a green screen terminal, ▸ Has to be emulated. @garyfleming
FIGHT CODE ROT USING CONTINUOUS IMPROVEMENT @GARYFLEMING @garyfleming
WHAT IS CODE ROT? @garyfleming
SYSTEM EXPERIMENT: @garyfleming
SYSTEM EXPERIMENT: FISHES AND TIME ▸ 10 minutes? ▸ 10
hours? ▸ 10 days? ▸ 10000 years? @garyfleming
ROT IN SOFTWARE @garyfleming
! @garyfleming
MULTI-FACETED @garyfleming
Problem KNOWING WHETHER YOUR SOFTWARE IS DEPLOYABLE @garyfleming
BRIEF INTRO TO CI/CD @garyfleming
CONTINUOUS INTEGRATION All developers/testers merge their code to a shared
mainline at least once a day. @garyfleming
CONTINUOUS INTEGRATION Related: ▸ Trunk-Based Development ▸ Feature Toggles @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
CONTINUOUS DEPLOYMENT All changes go to production; safely, quickly, and
sustainably. @garyfleming
CONTINUOUS DEPLOYMENT Related: Blue-Green releases. @garyfleming
@garyfleming
Problem DEPENDENCY UPDATES @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
IDEA UPDATE DEPENDENCIES DAILY @garyfleming
CONTINUOUS REGENERATION @garyfleming
CONTINUOUS REJUVENATION @garyfleming
EXPERIMENT: DEPENDENCY UPDATE DAILY ▸ Update ▸ Build and test
▸ Commit/Revert ▸ Commit causes CD to happen @garyfleming
OUTCOME: DEPENDENCY UPDATE DAILY Mostly success! ▸ Some Major Version
upgrades would need intervention, ▸ Temporary exclusions are important, @garyfleming
DEPENDENCY UPDATES: OTHER LANGUAGES ▸ Single versioned: Maven, Gradle, packages.config
e.g 5.4.1 3.0-ALPHA 1.3.2 @garyfleming
DEPENDENCY UPDATES: OTHER LANGUAGES ▸ Ranges and Lock files: gem/bundler,
most JS frameworks. >=5.4.1 3.* [3.7.1) @garyfleming
DEPENDENCY UPDATES: OTHER LANGUAGES ▸ Possibly open: pip, some JS
frameworks, gem some-dep a-different-dep @garyfleming
ALWAYS USE A LOCK FILE! Avoid "It works on my
machine" @garyfleming
RECENT DEVELOPMENTS ▸ Dependabot ▸ Atomist @garyfleming
GOOD TESTS ARE ESSENTIAL! @garyfleming
Problem RUNTIME ROT @garyfleming
ROT WILL SET IN ▸ JVM ▸ .NET ▸ NPM
version @garyfleming
THE CONTINUOUS NOW @garyfleming
INTERMEDIARY TOOLING ▸ Java -> Jabba ▸ Ruby -> RVM
▸ Node -> NVM ▸ Python -> Virtualenv (to some degree) @garyfleming
Problem STANDING SERVERS @garyfleming
Problem STANDING SERVERS @garyfleming
AVOID SNOWFLAKE SERVERS ▸ Hard to Reproduce ▸ Hard to
Modify ▸ Require manual processes, auditing, and docs. @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
INFRASTRUCTURE AS CODE ▸ Chef/Puppet/Ansible ▸ Terraform ▸ Containerisation ▸
Various cloud toolkits @garyfleming
ENGINEERING PRACTICE ▸ Daily Deletion ▸ Chaos Engineering ▸ Dev
Laptop Wipes @garyfleming
CAUTION: TAKE THE UPDATES @garyfleming
Problem LANGUISHING LANGUAGES @garyfleming
Problem LANGUISHING LANGUAGES @garyfleming
@garyfleming
AVOIDING OBSOLESCENCE ▸ Move to new versions, ▸ Cautiously embrace
new languages, ▸ Design language agnostic APIs @garyfleming
DESTROY YOUR MICROSERVICES @garyfleming
Problem PEOPLE COME AND GO. @garyfleming
Problem PEOPLE COME AND GO. @garyfleming
IF IT HURTS, DO IT MORE OFTEN. @garyfleming
People Prepping RETROS @garyfleming
People Prepping DOMAIN KNOWLEDGE ▸ User Story Maps ▸ Example
mapping @garyfleming
People Prepping STAFF LIQUIDITY MATRICES @garyfleming
@garyfleming
People Prepping BIGGER CHANGES @garyfleming
EVERYTHING IS ROTTING... @garyfleming
...YOU CAN GET BETTER @garyfleming
THANK YOU @GARYFLEMING @garyfleming