Justin Chang
Summary
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RockstarJustin Chang is a senior full-stack software engineer based in New York with 7 years of experience building scalable web and backend systems. He specializes in Node.js and C++ and has hands-on experience across SQL and NoSQL datastores, containerized deployments, and cloud platforms like AWS and Heroku. Justin has led dev teams and optimized developer workflows to accelerate product delivery, most recently contributing backend work at Aptos where he implemented NFT metadata parsers, gRPC parallelization, and image optimization for a layer-1 blockchain project. His background spans startups and research-facing platforms—helping launch Halo Science’s marketplace for researchers and industry—and includes building robotics fleet services and ML-driven analytics during internships. Comfortable across the full stack, he pairs system-level engineering with product sensibility to move features from prototype to production.
7 years of coding experience
Github Skills (14)
google-cloud-storage10
json-parser10
json10
jsonp10
storage10
rust10
parsing10
cloud-object-storage10
google-cloud10
image-optimization10
grpc9
ipfs9
blockchain8
smart-contracts7
Programming languages (11)
Github contributions (5)
aptos-labs/aptos-core
Feb 2023 - Dec 2025
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:122 reviews, 162 PRs, 580 pushes in 2 years 10 months
Contributions summary:Justin's commits primarily focused on the development and enhancement of the NFT metadata crawler. Their contributions included the implementation of various parsers for NFT metadata, such as JSON and URI parsers, along with image optimization functionalities. They integrated these components, including gRPC parallelization, with GCS. Further, the user added and configured aspects like configurable image quality and handling of the CDN prefix.
blockchainblockchain-networksmart-contractsaptos
UCSB-Theta-Tau/Website
Sep 2021 - Dec 2024
Contributions:1 review, 78 PRs, 81 pushes in 3 years 3 months
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