Learning From Failures at Scale 

@aditlal Adit Lal Product Engineer 

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“I have not failed. I’ve just found 10,000 ways that won’t work.” -Thomas Edison 

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Devote Yourself To A Growth Mindset Avoid Burnout Learn to say NO Learn Quick and Fail fast 

• Monolith Codebase • Find the zero’s and one’s • YAGNI - You Ain’t Gonna Need It! • Build feature toggles • Test startegies • Burning out and not knowing when to pause Gojek android repo 

Monolith Repo • 150 + modules • Product-wise distribution of modules • Ensuring stability , ownership is per product module • Test’s for every corner case. • Tooling and productivity 

70% of devs work on a single module at a time 25% work on two modules at a time Rest of them work on max 4~5 modules in a single commit 

Throw Ego out the window Tackle it one line at a time 

Zero’s and One’s • Read code bottoms up • Core > Products > Tools • Fail Fast Grow smarter • Understand and divide the problem • Test and brace for impact • Follow a Code style • Follow proper PR process 

YAGNI - You Ain’t Gonna Need It! • Follow a mindset and avoid breaking • Avoid “just in case we need them” • Find reasonable use case and stick with it 

Build feature - Toggles • Early access • Kill Switch • Opt-in • Helps incremental roll outs • Helps sunset a particular flow 

Build features • Feature Flags vs Branching • Avoid Long-Lived branching • Full control on lifecycles with toggles • Enables better team communication • Exposes dependencies - short lived branch • Merge more often - risk mitigation • Clean up 

Test startegies • Create feature branch • Break down story into smaller stories / points • Think outside the box , list down all edge cases • Think about - unit tests and how to add code coverage 

Test startegies • Tackle the fear • Work around uncertainty of your code - call it out. • Avoid breaking in production • Tests brings confidence into code reviews • Tests provide confidence in refactoring • It quintessential to our success - great ROI 

Test startegies • Setup • Teardown • Tests • Test Suites • Address Flaky tests • Test on real device vs emulators • Test in-House or in the Cloud • Performance & Security test 

Burning out and not knowing when to pause • Avoid thinking about everything at once • Adopt organisational skills • Drive a 1-1 with your lead • Never regret your decision. 

Burning out and not knowing when to pause • Ask yourself - Keep up or Fall behind? • Talk to a buddy , learn and share • Ensure good physical health and mental health • Set aside time to spike things • Invest wisely and calculate ROI efficiently • Go play football- while Gradle builds 

Android (Bonus) • Familiarising with design principles • Take a deep dive into the UI rendering pipeline. • Building custom views and create animations - test it on side projects (ofc). • Knowledge of the touch framework, gestures, notifications, sensors, storage, and file system. 

Android (Bonus) • Understanding the build process inside out. • Knowing what impacts the startup time of an app. • Measuring the performance - network, memory, or rendering perspective. • Optimising apps for seamless offline usage. • Working with large data sets or images in lists. 

Android (Bonus) Explore ☢ Test Break stuff Learn 

Thats all folks! @aditlal Adit Lal aditlal.dev http://bit.ly/reachAdit