Jakub looks to reduce immutability risks so he chooses to use a modern notation of upgradable contracts. The code looks solid and Jakub feels pretty good about himself.

Still, a lack of minor unit tests during development results in a missing 'initializer' modifier. When the launch date arrives, the TVL of the project pumps up to $50M but only 18 hours later the project is hacked. One missing modifier, one unit-test, million dollars of damage. Don’t repeat Jakub’s mistakes! Get a free check list and regularly receive useful materials