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
Architecting a Culture of Quality
Search
David Cramer
May 02, 2014
Programming
2
320
Architecting a Culture of Quality
Python Nordeste 2014
David Cramer
May 02, 2014
Tweet
Share
More Decks by David Cramer
See All by David Cramer
Mastering Duct Tape (PyCon Balkan 2018)
zeeg
2
890
Open Source as a Business (PyCon SG 2014)
zeeg
0
380
Angular.js Workshop (PyCon SG 2014)
zeeg
0
250
Redis Hacks
zeeg
3
240
Release Faster
zeeg
12
1.4k
Open Source as a Business (EuroPython 2013)
zeeg
18
17k
Building to Scale (PyCon TW 2013)
zeeg
18
1.3k
Building to Scale
zeeg
28
24k
Lessons in Testing - DjangoCon 2012
zeeg
8
1.4k
Other Decks in Programming
See All in Programming
GitHub Actions × AWS OIDC連携の仕組みと経緯を理解する
ota1022
0
220
半自動E2Eで手っ取り早くリグレッションテストを効率化しよう
beryu
6
2.4k
Чего вы не знали о строках в Python – Василий Рябов, PythoNN
sobolevn
0
150
CSC305 Lecture 03
javiergs
PRO
0
230
プログラマのための作曲入門
cheebow
0
510
AccessorySetupKitで実現するシームレスなペアリング体験 / Seamless pairing with AccessorySetupKit
nekowen
0
210
LLMとPlaywright/reg-suitを活用した jQueryリファクタリングの実際
kinocoboy2
4
660
Playwrightはどのようにクロスブラウザをサポートしているのか
yotahada3
7
2.2k
NetworkXとGNNで学ぶグラフデータ分析入門〜複雑な関係性を解き明かすPythonの力〜
mhrtech
3
930
iOSDC.pdf
chronos2500
2
650
PostgreSQLで手軽にDuckDBを使う!DuckDB&pg_duckdb入門/osk2025-duckdb
takahashiikki
1
230
私はどうやって技術力を上げたのか
yusukebe
43
17k
Featured
See All Featured
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
9
950
10 Git Anti Patterns You Should be Aware of
lemiorhan
PRO
657
61k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
2.6k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
840
Music & Morning Musume
bryan
46
6.8k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
Automating Front-end Workflow
addyosmani
1371
200k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
12
1.1k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
127
53k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Art, The Web, and Tiny UX
lynnandtonic
303
21k
Transcript
David Cramer twitter.com/zeeg Architecting a Culture of Quality
None
None
I work on Developer Productivity
(aka the build system + tooling)
ň+PGGFVQRWUJVJKUEJCPIGQWVTKIJVPQYʼn
None
How do we stop emergency pushes?
Identifying the Problems
Slow build process DQQVUVTCRRTQXKUKQPVGUVUGVE
Inaccurate or missing tests
Complex dependencies
Day 1 at Dropbox..
"Go through these manual steps to setup a dev environment”
None
"Why aren’t we using something like Vagrant?"
Keep Things Simple
“make” — a promise that it’s simple
.PHONY: develop setup-env ! # install dependencies develop: setup-env npm
install bower install env/bin/pip install -e . ! ! # ensure virtualenv setup-env: virtualenv ./env
a Makefile is just one solution
Bootstrap affects our sanity
vagrant up ⇢ puppet apply
Bootstrap affects newly hired developers
Bootstrap affects rebuilding environments
Bootstrap affects ability and time to run tests
Remove Dependencies
You cannot reproduce your production environment
Stop Trying
Do you really need Apache? RTQDCDN[PQV
Do you really need HAProxy? UGTKQWUN[!
Do you really need RabbitMQ? JQYCDQWV4GFKU!
Do you really need Zookeeper? PQRG
Do you really need Hadoop? NQN
Do you really need Anything?
Justify your dependencies
Use build servers for whatever is left over
Find Your Bottlenecks [QWRTQDCDN[FQP VGXGPPGGFC8/
Does a using (and maintaining) a VM actually save you
time?
Building A Testing Culture
Make testing so easy that you feel good about writing
tests
"Oh hey, a test I can copy/paste" +VņUCDQWVVJGOCMKPIKVCEEGUUKDNG
Encourage building better testing tools and paradigms
pip install pytest
pip install flake8
pip install mock
Your goal is to make testing accessible
Automatically test individual commits to ensure every change is stable
None
Test Continuously Before code review
Test Continuously During code review
Test Continuously Post-code review (merge)
Keep a tight Feedback Loop PQQPGYCPVUVQHKPFQWVVJGPGZVFC[VJCVVJGKTEQFGYCUDTQMGP
None
Time to response is so important that we fanout to
25 servers per build
Prevent mistakes by blocking commits which fail the build cycle
Red builds can never be deployed
Use Code Review
None
Use Code Review to sanity check code
Use Code Review to influence testing culture
Use Code Review to educate developers
Use Code Review to decrease cycle time
"Does this change look sane?"
"No, this will break X, Y, and Z" FKF[QWGXGPMPQY:YCUCVJKPI!
Aim for Quality Patches
Changes happen outside of master causing master to be the
new stable CMCVKRQTVTWPM
Quality Will Happen
Smaller, better commits
Accessibility is your goal
Accuracy breeds adoption
Scale culture through tooling
Thank You! ! twitter.com/zeeg