Mesquita served as a solutions architect at BlockBoxx from 2018 to 2019, working on the design and implementation of blockchain-based systems.

Mesquita was the chief technology officer of UnityChain from 2019 to 2021, leading its technical development.

Became chief technology officer of Railgun, leading work on cryptographic architecture, zero-knowledge proof systems, and cross-chain functionality.

Delivered a speech on extending Ethereum with meta transactions, detailing their structure, use cases for privacy, and security challenges.

Participated in a panel on the shift from privacy infrastructure to end-user applications in the crypto space.