Justin Florentine
Staff Protocol Engineer at ConsenSys
Philadelphia, Pennsylvania, United States
Summary
🤩
Rockstar🎓
Top SchoolJustin Florentine is a seasoned protocol engineer with 11 years of experience building and leading high-scale platform and backend systems, currently implementing Ethereum protocol features at ConsenSys as Staff Protocol Engineer. He has a strong track record in distributed systems and video delivery platforms from senior roles at ESPN and Elsevier, where he led multi-team initiatives, managed multimillion-dollar budgets, and delivered services supporting hundreds of millions of monthly video starts. An active contributor to the Hyperledger Besu project, Justin has worked on core blockchain logic—adding London hardfork support, updating protocol schedules, and fixing consensus-critical state root issues—demonstrating deep expertise in consensus and block validation. Based in Philadelphia, he blends hands-on engineering with cross-organizational leadership, driving developer advocacy and inner-sourcing programs to improve long-term technical health. Notably, his background spans both consumer-scale media systems and foundational blockchain client engineering, giving him a rare mix of product-facing resilience and protocol-level rigor.
11 years of coding experience
20 years of employment as a software developer
Bachelor of Arts (BA) Computer Science, Bachelor of Arts (BA) Computer Science at Drew University
English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (7)
javas10
protocols10
ethereum10
java10
blockchain10
implement10
evm9
Programming languages (17)
Github contributions (5)
hyperledger/besu
Jun 2021 - Jan 2023
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
Role in this project:
Back-end Developer
Back-end DeveloperContributions:15 releases, 751 reviews, 82 commits in 1 year 7 months
Contributions summary:Justin's primary contributions revolve around enhancing the Besu Ethereum client, specifically by adding and modifying code related to processing transactions and block validation. The user added support for the London hardfork to testnets, and included code changes for new network configurations. The contributions involve updating protocol schedules and validating block data, indicating a focus on core blockchain logic and consensus mechanisms. The user also implemented fixes related to state root mismatches during block processing.
besuhyperledgerlicensedethereump2p
jflo/besu
Jun 2021 - Apr 2025
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
Contributions:31 releases, 21 reviews, 194 PRs in 3 years 10 months
besuhyperledgerlicensedethereumenterprise-grade
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