Timothy Caswell
Principal Software Engineer at Vercel
Mountainburg, Arkansas, United States, Other
Summary
🤩
Rockstar🎓
Top SchoolTimothy Caswell is a Principal Software Engineer with over three decades of programming experience and 17 years in senior engineering roles, currently helping maintain and optimize Vercel’s global hosting platform. A longtime open-source leader and one of the original core contributors to Node.js (and creator of nvm), he builds across the full stack—from HTTP and websocket stacks and V8-based JS runtimes in C++ to browser frameworks, compilers, and bespoke data serialization formats. He has led embedded and distributed systems work at companies like Magic Leap and Kubos, shipping firmware, cloud backends, OTA update infrastructure, and even satellite networking stacks. Comfortable in Rust, Lua, C++, JavaScript and systems-level languages, he pairs deep implementation experience with operational rigor—on-call rotations, runbooks, and developer tooling—to deliver reliable, scalable platforms. Based in Arkansas, he also brings a maker’s ethos to product design and hardware work, having shipped IoT devices, AR headsets, and satellite systems.
17 years of coding experience
12 years of employment as a software developer
Bachelors of Science, Software Engineering, Bachelors of Science, Software Engineering at The University of Texas at DallasMath and Science, Math and Science at Texarkana CollegePre-Engineering, Physics, Chemistry, Pre-Engineering, Physics, Chemistry at Southern Arkansas UniversityComputer Science, Programming, General Education, Computer Science, Programming, General Education at University of Central Arkansas
Spanish
Stackoverflow
46reputation
4kreached
1answer
0questions
Github Skills (48)
asynchronous10
javascript10
middleware10
lib10
postgresql10
compilation10
back-end-development10
api-design10
scripting10
async10
css10
manager10
bash10
rails10
haml10
Programming languages (25)
Github contributions (5)
luvit/luv
Oct 2012 - Nov 2018
Bare libuv bindings for lua
Role in this project:
Back-end Developer
Back-end DeveloperContributions:30 releases, 2 reviews, 576 commits in 6 years 2 months
Contributions summary:Timothy primarily worked on modifying the Lua library "luv" to create bare libuv bindings. Their contributions included breaking down methods, adding new functions for TCP, timer, and stream functionalities, and addressing deprecated function calls. Additionally, they refactored the codebase to enable a method form for the various handle types, showing a good understanding of the project's requirements and structure.
lualuarocksluvitlibuvbare
creationix/step
Apr 2010 - Jan 2017
An async control-flow library that makes stepping through logic easy.
Role in this project:Back-end Developer
Back-end DeveloperContributions:20 commits, 4 PRs, 5 pushes in 6 years 10 months
Contributions summary:Timothy primarily worked on enhancing the `step` library, an async control-flow library. Their contributions involved refactoring the core logic, adding features like synchronous result handling and exception catching, and improving the `Step.fn` function to generate step chains. Furthermore, they added features such as a group helper that allows for handling results in parallel operations, along with relevant test suites. Throughout the commits, they addressed bugs and improved code reliability.
asynchronouscontrol-flowasynclogicasync-flow-control
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