JJ Kasper
Software Engineer at Vercel
San Francisco, California, United States
Summary
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Top expert inFull-Stack JavaScript Development
JJ Kasper is a software engineer with nine years of experience focused on Next.js and modern web deployment, currently building and maintaining core pieces of the Vercel platform. At Vercel he contributes across the stack—optimizing build and trace systems, improving routing and caching for the Next.js framework, and refining CLI and deployment behavior. He’s an active open-source maintainer whose work on performance-sensitive projects (like vercel/nft and terraform-aws-next-js) shows a deep understanding of build pipelines, serverless lambda packaging, and dependency tracing. Based in San Francisco, he combines practical full-stack engineering with thoughtful refactors (e.g., modernizing SDKs and async file ops) that reduce friction for both platform users and developers. A detail-oriented contributor, he often surfaces and fixes subtle URL/routing and build-edge cases that improve reliability at scale.
9 years of coding experience
Computer Science/Information Systems, Computer Science/Information Systems at Johnson County Community College
English
Github Skills (37)
asynchronous10
dependency-management10
url-routing10
caching10
filesystem10
javascript10
back-end-development10
apidoc10
async10
typescript10
build-system10
nextjs10
file-operations10
terraform10
notion10
Programming languages (9)
Github contributions (5)
vercel/next.js
Dec 2018 - Jan 2023
The React Framework
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:690 releases, 8065 reviews, 2344 commits in 4 years 2 months
Contributions summary:JJ primarily contributed to Next.js framework development, focusing on features such as adding and refining caching strategies for app router, enhancing the handling of request parameters, and optimizing build and trace handling. Their work involved modifying the core framework code, including additions and adjustments to the server and client-side components. These contributions improve the performance and stability of the framework, particularly related to server-side rendering and dynamic routing.
reactbrowserssgserver-renderingjavascript
milliHQ/terraform-aws-next-js
Aug 2019 - Jan 2021
Terraform module for building and deploying Next.js apps to AWS. Supports SSR (Lambda), Static (S3) and API (Lambda) pages.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:206 commits in 1 year 4 months
Contributions summary:JJ focused on optimizing the lambda creation process for Next.js applications deployed to AWS, particularly regarding build and deployment processes. They introduced features such as pseudo layer utilities and the use of the JSZip library to address a bug in the existing code. The commits involved significant changes to the build process and related utilities, specifically optimizing the zipping of lambda functions, API pages, and server-side components. Their work also included addressing build issues and ensuring proper type checking.
deployingapireactnext-jsserverless
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