From my experience working on financial systems, PII leaks rarely happen because someone intentionally exposed sensitive data. Most of the time they come from ordinary engineering decisions made during development that aren’t caught by code reviews. For example, a developer catches an exception from a third-party API and logs the response payload for troubleshooting.… Read more
Designing Resilient Scheduled Payment Systems
Scheduled financial transfers sound simple. A customer creates an instruction — for example, “transfer $100 every week” — and the system processes the transaction on the appropriate day.
Many systems begin with a straightforward implementation. A daily job reads instructions from a database, generates transactions, and attempts to process them. For a small system this can work well enough.… Read more