Sean Lilley
Distinguished Architect at Cesium
Philadelphia, Pennsylvania, United States
Summary
🤩
Rockstar🎓
Top School
Top expert inGeospatial Technology and Web Mapping
Sean Lilley is a Distinguished Architect with 11 years of experience building and optimizing 3D graphics pipelines, currently splitting senior architecture roles between Cesium and Bentley Systems from Philadelphia. He specializes in glTF and 3D-tiles tooling—contributing substantial backend and full-stack work to high-profile open-source projects like CesiumGS/gltf-pipeline, obj2gltf, and the 3d-tiles-validator—where he implemented asset optimization, normals generation, material handling, and utility tooling. Sean’s background spans GPU and real-time graphics research (AMD) to game-engine and WebGL education projects, giving him deep practical knowledge of rendering, data formats, and large-scale content pipelines. Known for shaping internal data structures and build tooling, he combines hands-on coding with architecture-level thought leadership to drive performant, production-ready 3D systems.
11 years of coding experience
6 years of employment as a software developer
Bachelor of Science in Engineering (B.S.E.), Digital Media Design, Bachelor of Science in Engineering (B.S.E.), Digital Media Design at University of Pennsylvania
Github Skills (16)
data-structures10
typescript10
javascript10
c-language10
typescripts10
cprogramming-language10
gltf10
data-structure10
typescript-types10
code-generation9
algorithm9
unit-testing9
gulp9
algorithms9
nodejs8
Programming languages (10)
Github contributions (5)
CesiumGS/3d-tiles-validator
Aug 2016 - Jan 2023
Validator for 3D Tiles :vertical_traffic_light:
Role in this project:
Back-end Developer
Back-end DeveloperContributions:26 reviews, 285 commits, 169 PRs in 6 years 6 months
Contributions summary:Sean appears to be primarily responsible for initial project setup, including the addition of external dependencies and TypeScript definitions. Their commits reflect the addition of a Bluebird type definition file and the subsequent addition of validator and generator projects. Additionally, the user contributed to the implementation of a gzipTileset script within the tools directory, suggesting involvement in a utility for data compression and manipulation.
light3d-tilestraffic-lightvalidatortraffic
CesiumGS/gltf-pipeline
Jun 2016 - Jan 2023
Content pipeline tools for optimizing glTF assets. :globe_with_meridians:
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:6 reviews, 547 commits, 280 PRs in 6 years 8 months
Contributions summary:Sean primarily contributed to the content pipeline tools for optimizing glTF assets, a project related to 3D converter and glTF. Their contributions included adding features for running and debugging unit tests, fixing bugs related to JSON interfaces and name changes, and implementing code formatting. They also implemented the generation of smooth and face normals to the code.
globepipelinewebgl2playcanvas3d-converter
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