Data ⁽²⁾

Red flag: UI actions freeze >3s. Likely cause: Heavy compute in HTTP request/response; unrealistic perf testing on empty data. Action: Push non-trivial work to queues/streams; small validations only, guarded by strict timeouts + circuit breakers. KPI: p95/p99 latency per endpoint; queue age; error budget burn.

This short essay is inspired by my job in the State Lottery of Serbia between May 2005 and May 2012. In the essay, I tried to summarize how the state lottery's Information System (IS) evolved. First steps were manual report generation—the data analyst way. Unfortunately, this…