LedgerFlow — real-time finance dashboard

A fintech team's reporting tool took 8+ seconds to load and buckled under concurrent users at month-end close.

• Profiled the existing app and isolated N+1 queries plus a blocking client bundle.
• Introduced a typed API layer with cached aggregates and streaming server components.
• Added a design-system refresh so dense financial data stayed scannable.

• Median load dropped from 8.4s to 0.7s.
• Month-end concurrency handled with no incidents across two quarters.
• Support tickets about 'slow reports' fell to zero.