John
New York, New York, United States
Summary
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RockstarJohn Chang is a Senior Software Engineer based in New York with nine years of experience building blockchain and distributed systems. He has held roles at Chainlink Labs, Aptos Labs, and AWS, bringing deep practical expertise in Move, Rust, and smart contract infrastructure. His open-source contributions to Aptos Core include adding vector range functionality, object code deployment and upgrade features, and collection mutation events—work that touches core layer-1 blockchain behavior and indexer metadata. Comfortable in both startup and enterprise settings, he blends low-level protocol work with production-grade backend engineering. Known as a web3 engineer on GitHub, he focuses on making smart-contract platforms more usable and auditable. Colleagues rely on him for pragmatic design and shipping robust system-level features that enable broader developer and user adoption.
9 years of coding experience
Github Skills (9)
aptos10
smart-contracts10
move10
blockchain10
testing9
algorithms8
data-structures8
algorithm8
data-structure8
Programming languages (12)
Github contributions (5)
aptos-labs/aptos-core
Nov 2023 - Dec 2024
Aptos is a layer 1 blockchain built to support the widespread use of blockchain through better technology and user experience.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:98 reviews, 31 PRs, 53 pushes in 1 year 1 month
Contributions summary:John contributed to the Aptos blockchain's core functionality by implementing and testing features within the Move programming language. They added a range function to the vector module, enhancing its utility. The user also worked on object code deployment features, including deployment, upgrade, and permissioning, indicating a focus on smart contract and system-level development. Additionally, the user added collection mutation events, adding metadata for indexers.
blockchainblockchain-networksmart-contractsaptos
JohnChangUK/Payment-Choreography-Saga
Dec 2020 - Jan 2022
Contributions:29 commits, 2 PRs, 27 pushes in 1 year
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