Prefer stable, versioned endpoints and idempotent writes where possible—retries are inevitable.
Map data ownership: which system is the source of truth for customers, inventory, or PHI-adjacent metadata?
Plan for rate limits, webhook retries, and reconciliation jobs when counts disagree after outages.
Buy when your process matches the product; build when your process is the differentiator.
Software is never “done”—platforms, browsers, and threats move constantly.
Internal apps are tempting targets because they sit behind “obscurity”—until they are not.
The most expensive bugs are built from ambiguous specs.