Willian Mitsuda
Ethereum Core Developer at Otterscan Labs
Brazil
Summary
🤩
Rockstar🎓
Top SchoolWillian Mitsuda is an Ethereum Core Developer and founder with two decades of experience delivering high-availability, mission-critical systems and a decade focused on blockchain and crypto infrastructure. Based in Brazil, he contributes to Erigon—an efficiency-focused Ethereum implementation—and built Otterscan, a blazing-fast local block explorer, showing strength across both backend consensus/data structures and frontend React-driven UIs. His career spans leadership roles in payments and R&D at PagSeguro and CTO experience at a Bitcoin payments startup, combining product ownership with deep operational reliability expertise. Willian is comfortable moving between database/schema work, protocol-level fixes, and polished UX components, a rare full-stack skill set in core blockchain engineering. He often tackles the less-glamorous but vital plumbing—contingency systems, issuance buckets, and API bug fixes—that keep decentralized finance robust in production.
10 years of coding experience
4 years of employment as a software developer
Universidade São Judas Tadeu
English, Portuguese
Stackoverflow
1,248reputation
86kreached
3answers
4questions
editor
top-5%
eclipse
top-5%
Github Skills (34)
typescript10
uid10
go10
front-end-development10
ethereum10
database-design10
blockchain10
typescript-types10
typescripts10
react10
editor9
apidoc9
ui-design9
tailwindcss9
api9
Programming languages (16)
Github contributions (5)
otterscan/otterscan
Jul 2021 - Jan 2023
A blazingly fast, local, Ethereum block explorer built on top of Erigon
Role in this project:
Front-end Developer
Front-end DeveloperContributions:37 releases, 209 reviews, 1062 commits in 1 year 6 months
Contributions summary:Willian's commits primarily focused on modifying and implementing React components within the Otterscan project, a block explorer built on top of Erigon. Their work included refactoring components like `AddressOrENSName`, adding new UI elements such as the `InputDecoder` and modifying existing components like `TransactionItem`, and developing components for the London hardfork dashboard. The user also worked on theming and styling elements, suggesting a strong emphasis on UI development and enhancements.
ethereumblockchainblockexplorer
erigontech/erigon
Jul 2021 - Jan 2023
Ethereum implementation on the efficiency frontier
Role in this project:Back-end Developer
Back-end DeveloperContributions:49 reviews, 8 commits, 132 PRs in 1 year 6 months
Contributions summary:Willian primarily contributed to the Ethereum implementation, focusing on backend logic and data structures. They added and modified data structures and database tables, such as the "issuance bucket" and other features related to block and transaction processing. Furthermore, the user addressed issues related to error message parameters and fixed bugs in Otterscan API, the system's API for fetching blockchain data. The user's contributions also involved fixing help messages and adding some features.
ethereumblockchain
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