Narayan's Digital Garden
Everything I Know
A living, interlinked garden of notes. Follow the links, or search across all of it.
From the garden
All notesCredit card issuers in India
Which Indian banks are worth a credit card application, which are not, and which bank actually issues each fintech card.
Credit card portfolio goals
Fifteen targets a credit card wallet is measured against, covering issuer spread, spend categories, realised return, fees, and a 5 to 7 card endgame.
Credit card do's and don'ts
The rules that decide whether a credit card pays you or costs you, written for Indian issuers, cards, and bureaus.
System Design
How these notes are organised, from the wire protocols up to full designs.
IP Address
What an IP address is and why the internet needs one.
DSA Patterns
Work out which pattern a problem wants from its constraints, input shape, output shape and wording, then write it from a Java template short enough to memorise.