Finance

Large Czech bank

Contract generation 40× faster

// The problem

Generating client contracts took over two hours. The system crawled through millions of records with inefficient queries and nested loops — servers ran at 95% CPU, staff waited and clients were frustrated.

// The solution

We profiled the hot paths and found the root cause: repeated linear lookups in collections. We rewrote them as O(1) lookups with HashSet and Dictionary, added caching and batch processing — all without buying more powerful hardware.

// Results
  • Contract generation from 2+ hours to 3 minutes (40×)
  • Server load from 95% to 15% CPU — with no hardware investment
  • Staff get the result instantly, not after hours of waiting
  • The system handles many times more contracts in parallel
// Key metrics
Generation time
Before 2+ hours After 3 minutes
40×
Server load
Before 95% After 15%
-80%
// Technologies
.NETC#SQL ServerHashsetsDictionary
// CTA

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