Problem
Millions of citizens needed accurate, near-real-time fuel pricing information, submitted by fuel stations nationwide, with no tolerance for downtime or incorrect data at this scale.
Challenge
There is no staging environment that fully prepares a team for a system operating at the scale of 69.9 million citizens. The system had to be built right the first time, not discovered through failure.
Architecture
[ADD VERIFIED DETAIL: system diagram, key services, and data flow between fuel stations, the central portal, and the citizen-facing lookup]
Lessons
You either build it right, or you find out at the worst possible time. At this scale, there's no room for finding out the hard way.