A presentation at WEBdeLDN in in London, UK by Joseph Shambrook
Quick prod releases and what can go (horribly) wrong Joseph Shambrook - January 2019
I’m Joe
Front End Developer at
Here to talk about a pretty bad, yet simple, mistake I made once
Mistakes are GOOD
Why? ● You learn from them ● Highlight undetected problems ● Usually reversible
My true story It’s okay to laugh
Front End Developer at an e-commerce website
Used by thousands of people every day
My job: Creating A/B tests to improve the user experience* *make more money
Incredibly fast-paced environment
Fast and common releases to Production
Best practice was sacrificed
● Code reviews were optional ● Coding standards were ignored ● Old tests were not removed ● No automated testing at all I’m not joking
The checkout process was spread across separate pages
Basket Review Personal Details Delivery Details Payment Details Final Review
Basket Review Personal Details Delivery Details Payment Details Final Review
FORM SUBMIT SIDEBAR
FORM SIDEBAR SUBMIT
Started code review Merged to master Pushed to Production Started test
Intermission: HTML Forms 101
FORM SIDEBAR SUBMIT
Basket Review Personal Details Delivery Details Payment Details Final Review
Basket Review Personal Details Delivery Details Payment Details Final Review WTF
The result?
What did we I learn?
Best practice exists for a reason
● Carry out code reviews ● Follow coding standards ● Remove redundant code ● Write automated tests
Anyone can make a mistake
● Support and understand ● Help to teach to avoid a recurrence
Thank you! Connect with me on LinkedIn! - josephshambrook
A lightning talk demonstrating why opting out of things like automated testing can have disastrous results.
for free. You
can too.