Ulyssa Mello
Staff Engineer at Fastly
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolUlyssa Mello is a Staff Engineer in San Francisco with 13 years of systems and backend engineering experience, currently leading projects at Fastly. She has deep expertise in operating systems and networking—demonstrated by sustained contributions to illumos and SmartOS (including IPv6, DHCPv6 fixes, and new tooling like ndp)—and a strong history of hardening language runtimes and tools such as awk and the Pyret language. Her background blends production engineering at Joyent with years of teaching and systems support at Brown University, giving her a rare mix of production-scale debugging skill and clear technical communication. Known on GitHub as @ulyssa, she focuses on subtle correctness fixes and protocol-level improvements that quietly raise reliability for large systems.
13 years of coding experience
9 years of employment as a software developer
Rogers High SchoolBachelor of Science (B.Sc.), Computer Science, Bachelor of Science (B.Sc.), Computer Science at Brown University
Github Skills (40)
debugging10
network-configuration10
debug10
javascript10
il10
strings10
awk10
programming-language10
text-manipulation10
net10
c1110
networking10
c1710
regular-expression10
manage10
Programming languages (16)
Github contributions (5)
TritonDataCenter/smartos-live
Jul 2015 - Jul 2019
For more information, please see http://smartos.org/ For any questions that aren't answered there, please join the SmartOS discussion list: https://smartos.topicbox.com/groups/smartos-discuss
Role in this project:
Back-end Developer
Back-end DeveloperContributions:77 commits, 1 PR, 40 pushes in 4 years
Contributions summary:Ulyssa made various contributions to the SmartOS live repository. They worked on adding support for IPv6 addresses, which included changes to vmadm and SmartOS zones. These changes involved modifications to core VM management logic and networking components, specifically within the VM.js and nic.js files. Further contributions included fixes for gateway handling during upgrades and support for IPv6 resolvers.
groupssmartosjoindiscussiot
onetrueawk/awk
Sep 2018 - Jun 2019
One true awk
Role in this project:Back-end Developer
Back-end DeveloperContributions:14 commits, 12 PRs, 3 comments in 9 months
Contributions summary:Ulyssa primarily focused on bug fixes and improvements to the core functionality of the awk interpreter. They addressed issues related to format character precision, overflow protection during string conversions, and assignment during concatenation operations. Furthermore, the user implemented fixes for numeric values related to SUBSEP, FS, RS, OFS, and ORS, alongside improvements to error messages and handling of regular expressions.
awk
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