Toru Maesaka
Founder And CEO at Chrono Technologies
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolToru Maesaka is a founder and seasoned software engineer with 14 years of experience building high-performance, secure internet infrastructure from startups to Fastly-level scale. Based in San Francisco, he combines hands-on protocol and backend engineering with leadership as Founder & CEO of Chrono Technologies and as the first hire who built Thistle’s server platform. His open-source contributions to prominent projects like H2O, picotls, and quicly show deep expertise in HTTP/2/3, QUIC, and TLS—improving core server behaviors, hardening TLS handling, and adding robust ACK decoding with unit tests. He has a track record of shipping pragmatic, security-conscious code, and driving org-level improvements such as bringing eBPF into production at Fastly. Comfortable across startup and large-company environments, he turns low-level protocol work into reliable, production-ready systems.
14 years of coding experience
17 years of employment as a software developer
Postgraduate Diploma in Science Computer Science, Postgraduate Diploma in Science Computer Science at University of Otago
Stackoverflow
1reputation
0reached
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Github Skills (14)
c1710
it-security10
http10
error-handling10
c1110
tls1310
quic10
network-protocol10
openssl10
security10
networking9
testing9
proxy9
mruby7
Programming languages (6)
Github contributions (5)
h2o/h2o
Jan 2019 - Jan 2021
H2O - the optimized HTTP/1, HTTP/2, HTTP/3 server
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 reviews, 298 commits, 36 PRs in 2 years
Contributions summary:Toru focused on improving the H2O server's HTTP/2 and HTTP/1 client functionalities. Their contributions included adding an API to get the underlying socket, implementing a close-connection setting for the proxy, and handling the setting in the proxy loop. They also addressed a buffer overrun bug in the mruby middleware. The user demonstrated the ability to modify core server functionalities, encompassing both client and proxy logic.
h2ohttp-clientfiddlerhttp2optimized
h2o/quicly
Jun 2019 - Feb 2021
A modular QUIC stack designed primarily for H2O
Role in this project:Back-end Developer
Back-end DeveloperContributions:10 reviews, 64 commits, 13 PRs in 1 year 7 months
Contributions summary:Toru's contributions primarily involve modifying the `lib/frame.c` and `include/quicly/frame.h` files, indicating a focus on the QUIC protocol's frame handling mechanisms. They introduced and refined the implementation of ACK frame decoding, including adding bounds checks and improving the decoding logic to handle various scenarios. Additionally, they refactored the ACK frame decoder to enhance readability and included unit tests to ensure the correct decoding of ACK frames. These changes directly impact the core functionality of the QUIC stack.
quich2ohttp3protocolh3
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