Joanne Koong
Software Engineer at Meta
United States
Summary
🤩
Rockstar🎓
Top SchoolJoanne Koong is a software engineer with a decade of experience building high-performance back-end systems at Meta and Netflix, and a CS background from Harvard. She has deep kernel and systems expertise, contributing to flagship open-source projects like the Linux kernel and libfuse to improve FUSE performance and buffer management. Her work on libbpf added dynamic pointer support and verifier enhancements for BPF, reflecting strong skills in low-level tooling and observability infrastructures. Joanne moves fluidly between production systems at hyperscalers and upstream open-source maintenance, focusing on efficiency, robustness, and dynamic configuration. Colleagues know her for practical refactors that reduce complexity and for shipping subtle but impactful fixes in core I/O paths. She combines academic rigor with hands-on systems engineering to tackle demanding storage and networking challenges.
11 years of coding experience
7 years of employment as a software developer
Computer Science, Computer Science at Harvard University
Github Skills (11)
c1710
libbpf10
filesystem10
c1110
system-programming10
linux-kernel10
bpf10
ring-buffer10
fuse10
tracer9
trace9
Programming languages (7)
Github contributions (5)
libfuse/libfuse
Jul 2024 - Oct 2025
The reference implementation of the Linux FUSE (Filesystem in Userspace) interface
Role in this project:
Back-end Developer
Back-end DeveloperContributions:35 reviews, 22 PRs, 69 comments in 1 year 3 months
Contributions summary:Joanne primarily contributed to the libfuse project by implementing features and fixing bugs related to file system interactions and buffer management. They introduced functionality for handling directory entries, initialized session buffer sizes dynamically based on system configuration, and added a wrapper function for more robust string-to-long conversions. Furthermore, the user refactored the code to use internal functions. These changes improve the performance and reliability of FUSE-based file systems.
filesystemlinuxuserspace
libbpf/libbpf
May 2022 - Jul 2022
Automated upstream mirror for libbpf stand-alone build.
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits in 1 month
Contributions summary:Joanne primarily contributed to the development of BPF (Berkeley Packet Filter) functionalities within the libbpf repository. Their work focused on adding and implementing dynamic pointer (dynptr) support, including helper functions like `bpf_dynptr_read`, `bpf_dynptr_write`, and `bpf_dynptr_from_mem`. They also added verifier support for these dynptrs and data slices, enhancing the capabilities of BPF programs for ring buffer operations. Furthermore, the user corrected documentation for specific BPF helpers.
libbpfbpftracing
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