Build Challenges

Implement the core swap function for a constant-product AMM. Handle reserves, calculate output amounts, and apply fees correctly.

Write a reentrancy guard that prevents flash loan attacks on a lending pool. Test against three known exploit patterns.

Build a fully compliant ERC-4626 tokenized vault with deposit, withdraw, and share accounting. Handle edge cases for zero supply.

Implement a cliff-based vesting contract with linear release. Support multiple beneficiaries and revocation by admin.

Deploy a UUPS upgradeable contract, verify storage layout, then perform a safe upgrade without data loss.

Create, vote on, and execute a governance proposal using OpenZeppelin Governor. Handle quorum, timelock, and cancellation.