Personal finance and money-app engineering, written out
Longer arguments about money and about building software that handles it, showing the reasoning behind each decision instead of announcing it.
How to build an expense tracker project that gets the money right
The four decisions that separate a portfolio expense tracker from a weekend one: the money type, a schema that survives transfers, isolation, and fixtures.ReadDoes the 50/30/20 rule work in India?
The 50/30/20 rule assumes a US cost structure. What changes when rent, family support and festival spending enter the picture, and what to keep fixed.ReadWhy an expense tracker must not store money as a float
0.1 + 0.2 is not 0.3 in binary floating point. What that means for an expense tracker, where the error shows up first, and what Chillar's does instead.Read
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