Bruno Guerios developed two core features across the balancer/balancer-v3-monorepo and cowprotocol/services repositories, focusing on DeFi infrastructure and smart contract engineering. He delivered a standalone price impact calculation utility for Balancer V3, implementing the PriceImpactHelper contract in Solidity to improve slippage estimates during unbalanced liquidity additions. His approach emphasized modularity and testability, integrating router and vault interfaces for accurate computations. Later, Bruno integrated the BalancerQueries contract in Rust for cowprotocol/services, enabling reliable Balancer V2 swap data access for solvers and analytics. His work demonstrated depth in build systems, monorepo management, and smart contract integration, addressing critical DeFi data needs.