Raphaël Zumer
Senior Video Transcoding Engineer at Vimeo
Pittsburgh, Pennsylvania, United States
Summary
🤩
Rockstar🎓
Top SchoolRaphaël Zumer is a Senior Video Transcoding Engineer with 11 years of experience building backend systems for high-performance multimedia processing and large-scale cloud platforms. Based in Pittsburgh, he specializes in video compression, digital signal processing, spherical video reprojection, spatial audio mixing and rate-controlled animated GIF compression, often bridging low-level codec work with product and platform needs. At Vimeo he drives cross-functional projects, from custom color-space conversions to metrics-driven scalability efforts, and represents engineering externally through conference talks and blog posts. An active open-source contributor, he has helped optimize the AV1 encoder rav1e and improved emulation and ROM-identification tooling in RetroArch and melonDS—work that reflects a mix of algorithmic rigor and pragmatic systems engineering. He brings a research-minded curiosity (including past ML-based computer vision work) to production problems, pairing hardware-emulation and signal-processing know-how with practical developer tooling.
11 years of coding experience
6 years of employment as a software developer
Bachelor of Engineering (B.Eng.), Information Technology, Bachelor of Engineering (B.Eng.), Information Technology at École de technologie supérieureDiploma of College Studies, Computer Science Technology, Diploma of College Studies, Computer Science Technology at Vanier College
French, English, Spanish, Japanese
Github Skills (29)
algorithm10
algorithms10
md510
c-language10
video-encoding10
rc10
c1110
device-emulation10
c1710
arch10
av1-codec10
libretro10
nes10
rust10
flash-memory10
Programming languages (17)
Github contributions (5)
xiph/rav1e
Jun 2018 - Feb 2021
The fastest and safest AV1 encoder.
Role in this project:
Back-end Developer & Algorithm Engineer
Back-end Developer & Algorithm EngineerContributions:2 releases, 35 reviews, 216 commits in 2 years 9 months
Contributions summary:Raphaël focused on implementing and testing the Paeth predictor, including adding the predictor and its corresponding tests. They also contributed to the RDO (Rate-Distortion Optimization) functionality, adding a decision for partition splitting. Additionally, the user made optimizations and refactorings to the RDO functions and data structures to improve the efficiency of the AV1 encoder. Further contributions include implementing smooth and directional prediction methods.
av1-encoderencoderfastestav1
melonDS-emu/melonDS
Dec 2019 - May 2021
DS emulator, sorta
Role in this project:Backend Developer
Backend DeveloperContributions:10 reviews, 43 commits, 12 PRs in 1 year 5 months
Contributions summary:Raphaël significantly contributed to the development of the melonDS emulator, specifically focusing on improving GBA cartridge emulation. They implemented Flash memory reading and writing, handled GBA GPIO operations including solar sensor processing, and added support for various GBA save types. Furthermore, they refactored the cartridge loading and saving logic, incorporating the necessary UI hooks for GBA cartridge support, and addressed character encoding issues, ensuring consistent GBA cartridge behavior.
emulatoremulationdsinds
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