Joaquim Silva
Systems Engineer at Cloudflare
Porto, Portugal
Summary
🤩
Rockstar🎓
Top SchoolJoaquim Silva is a systems engineer with a PhD in Computer Science and eight years of experience specializing in mobile edge computing, edge clouds, and distributed runtime systems. Currently on the Cloudflare Workers team, he has contributed core runtime features such as hibernatable WebSocket support and robust actor alarm handling for the widely used workerd project. His background blends academic research—authoring multiple peer-reviewed papers and building a flexible framework for studying mobile edge clouds—with hands-on product work, including the citation export system used by Authenticus. He has taught databases and systems at the Universidade do Porto and spent research time at Carnegie Mellon, reflecting a strong bridge between theory and practice. Comfortable in low-level systems and application-level tooling, Joaquim is adept at turning complex distributed systems research into production-ready features. Based in Porto, Portugal, he combines deep academic rigor with pragmatic engineering that improves real-world cloud runtimes.
8 years of coding experience
7 years of employment as a software developer
Master's degree, Ciência da Computação, Concluded with an 18 in 20 (B), Master's degree, Ciência da Computação, Concluded with an 18 in 20 (B) at Faculdade de Ciências da Universidade do PortoDoctor of Philosophy (PhD), Ciência da Computação, Approved, Doctor of Philosophy (PhD), Ciência da Computação, Approved at Universidade do Porto
Portuguese, English, Spanish
Github Skills (6)
c-language10
websocket10
cprogramming-language10
cloudflare-workers10
actor-model10
server-side9
Programming languages (3)
Github contributions (5)
cloudflare/workerd
Jan 2023 - Jan 2023
The JavaScript / Wasm runtime that powers Cloudflare Workers
Role in this project:
Back-end Developer
Back-end DeveloperContributions:71 reviews, 2 commits, 36 PRs in 1 day
Contributions summary:Joaquim contributed to the development of hibernatable web socket features, which involved modifications to the core runtime and API. Their work includes the implementation of auto-responses for web sockets, enabling ping/pong functionalities at the application level. They also addressed issues related to actor alarms, specifically dealing with crashes and ensuring correct behavior when deleting alarms inside their handlers. Further contributions included improvements to websocket pumping and related race conditions.
cloudflarejavascriptpowersruntimeservice-worker
jqmmes/Jay
Sep 2018 - Jan 2022
Contributions:140 commits, 8 pushes, 1 tag in 3 years 4 months
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