Danno Ferrin - Principal Software Engineer at Swirlds Labs

Danno Ferrin

Principal Software Engineer at Swirlds Labs

Louisville, Colorado, United States

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Summary

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Rockstar

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Top School

Danno Ferrin is a Principal Software Engineer with 19 years of experience building low-level systems, developer tooling, and blockchain infrastructure from JavaFX packaging to EVM execution. He led EVM equivalence work for Hedera/Swirlds Labs—architecting ERC-20/721 compatibility and the JSON-RPC bridge—and previously headed protocol work on the Hyperledger Besu/ConsenSys Quorum Ethereum client. Comfortable across backend, full-stack and core language projects, his open-source footprint spans Groovy, OpenJFX, ControlsFX and high-impact crypto repos where he implemented and optimized EVM opcodes and gas logic. A pragmatic systems thinker, he focuses on the “nougat” of software: the invisible mechanics that make interactive experiences reliable and performant. Based in Louisville, Colorado, he pairs production-grade engineering with a knack for packaging and deployment nuances that many protocol engineers overlook. He also brings an idiosyncratic sense of humor—self-aware typos included—reflecting a down-to-earth approach to complex technical challenges.

19 years of coding experience

22 years of employment as a software developer

Green Mountain High School

BS, Computer Science, BS, Computer Science at Brigham Young University

Stackoverflow

Stats

5,338reputation

657kreached

41answers

7questions

Badges

swing

top-5%

closures

top-5%

java

top-5%

groovy

top-1%

Github Skills (39)

solidity10

groovy10

evm10

maven-plugin10

javafx10

virtual-machine10

networking10

java10

openjdk10

javas10

ethereum10

controlsfx10

blockchain10

maven10

swing10

Programming languages (22)

C#JavaCSSC++JinjaRustScalaIo

Github contributions (5)

hyperledger/besu

Oct 2018 - Jan 2023

An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu

Role in this project:

Backend Developer

Contributions:12 releases, 993 reviews, 466 commits in 4 years 4 months

Contributions summary:Danno contributed to the core functionality of the Besu Ethereum client, specifically focusing on Solidity code processing and EVM execution. The commits demonstrate a proficiency in debugging and improving gas calculations and handling potential errors that could arise during runtime. They enhanced functionality of the EVM, including handling of EIPs and specific byte code optimizations, highlighting expertise in low-level Ethereum Virtual Machine operations.

besuhyperledgerlicensedethereump2p

hiero-ledger/hiero-consensus-node

Aug 2021 - Dec 2022

Crypto, token, consensus, file, and smart contract services for a Hiero based network

Role in this project:

Back-end Developer

Contributions:320 reviews, 156 commits, 103 PRs in 1 year 3 months

Contributions summary:Danno's contributions centered on developing and testing EVM opcode functionalities. They implemented and tested Ethereum Virtual Machine (EVM) opcodes within the context of a Hiero-based network, creating contracts for specific opcode exercises and focusing on transaction size and gas limits. These efforts included setting up test environments, building upon existing contracts, and addressing related gas issues. The user also performed several upgrades.

consensussmart-contractethereumcontractblockchain

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