txBatch

We use Amazon DynamoDB because it supports JSON, works quickly, allows more writes/second than SQL, and integrates well with AWS Lambdas.

We use Vue.js because it's very easy to get started, easy to read, and allows us to easily manage data on-app without repeating code.

(e.g. the same base transaction data used to export to XLSX spreadsheet is the same transaction data that appears in the table on the app)

We use Carrd because it's beautiful, simple, cheap, and forces you to stay within constraints but not to an unreasonable level.