Harry Kalodner
CTO And Co-Founder at Offchain Labs
New Jersey, United States
Summary
🤩
Rockstar🎓
Top SchoolHarry Kalodner is a CTO and co-founder with 11 years of engineering experience building core infrastructure for blockchain scaling at Offchain Labs, the team behind Arbitrum. He blends deep backend expertise in EVM-related components and smart contract correctness with hands-on frontend work—contributing to both Arbitrum's token-bridge UI and low-level gateway and parsing libraries. A Princeton PhD candidate in computer science and Bowdoin alumnus, he pairs rigorous academic training with practical production skills and testing discipline. Based in New Jersey, he has roots in systems and web development dating back to internships at Apple and earlier web services work, demonstrating a durable mix of research, product focus, and ship-it engineering.
11 years of coding experience
1 year of employment as a software developer
Bachelor's Degree Computer Science Mathematics, Bachelor's Degree Computer Science Mathematics at Bowdoin CollegeLoomis ChaffeeDoctor of Philosophy (Ph.D.) Computer Science, Doctor of Philosophy (Ph.D.) Computer Science at Princeton University
Latin
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (18)
javascript10
solidity10
testing10
user-interface10
arb10
go10
ethereum10
html10
smart-contracts10
react10
lib9
css9
bootstra8
bootstrap8
web3js7
Programming languages (12)
Github contributions (5)
OffchainLabs/arbitrum-classic
Feb 2019 - Oct 2022
Powers fast, private, decentralized applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:29 releases, 976 reviews, 4558 commits in 3 years 8 months
Contributions summary:Harry contributed to the core functionality of the Arbitrum Classic repository, specifically focusing on typesafe implementations for SoliditySHA3. They also refactored existing code. The user's work included enhancing the gas estimation test and addressing issues related to the handling of deposits and reorgs. Their commits demonstrate an understanding of EVM-related components and testing methodologies within the Arbitrum ecosystem.
ipfsethereump2ppowersblockchain
OffchainLabs/arbitrum-token-bridge
Feb 2020 - Sep 2022
💙 Interface for bridging assets to and from Arbitrum chains
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:67 reviews, 58 commits, 44 PRs in 2 years 7 months
Contributions summary:Harry primarily worked on the frontend of the Arbitrum token bridge, contributing to the user interface and user experience. The commits show the implementation of UI elements, including the addition of a loading message, and the modification of existing components. The user also addressed UI issues and implemented improvements related to token display. The user demonstrated a clear understanding of frontend technologies.
ethereumbridgeblockchainweb3token
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