Bill Zissimopoulos
Founder And Owner at secfs.net
Kirkland, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolBill Zissimopoulos is a founder-led software engineer and entrepreneur with 25 years of systems and product engineering experience and over a decade of business leadership running Navimatics and secfs.net. He blends deep low-level expertise in filesystems, systems programming and networking with product-minded execution—shipping mobile and desktop navigation apps that reached Apple's top-grossing lists and millions in sales. An author of WinFsp and a frequent trending open-source maintainer on GitHub, he has contributed critical fixes to libfuse, Git for Windows and other cross-platform filesystem projects. His background includes research OS kernel work, patents in networking and security, and senior engineering roles at Microsoft and Netscape, reflecting a rare mix of research, product and shipping experience. Based in Kirkland, WA, he also brings practical team-building and mentoring skills from recruiting through delivery. Outside engineering he’s an aviator and sailor, a hint at his appetite for complex systems and disciplined risk-taking.
11 years of coding experience
15 years of employment as a software developer
BSc, Mathematics, BSc, Mathematics at Ethnikon kai Kapodistriakon Panepistimion AthinonUniversity College London
Stackoverflow
555reputation
25kreached
5answers
11questions
Github Skills (36)
symlink10
filesystem10
posixct10
wp-api10
freebsd10
windows10
c1110
winapi10
c1710
go10
github-api10
posix10
fileio10
file-processing10
file-handling10
Programming languages (18)
Github contributions (5)
winfsp/winfsp
Nov 2015 - Jan 2023
Windows File System Proxy - FUSE for Windows
Role in this project:
Back-end Developer & Systems Engineer
Back-end Developer & Systems EngineerContributions:73 releases, 11 reviews, 2924 commits in 7 years 3 months
Contributions summary:Bill made several contributions focused on enhancing the WinFsp project's capabilities. They addressed a bug related to directory entries in the FUSE implementation, corrected the handling of file attributes, and refactored the code to add improved file handling semantics, including support for the `FILE_DELETE_ON_CLOSE` and POSIX unlink operations. The contributions also included the implementation of a new FSP_FSCTL_QUERY_WINFSP control code and improved performance.
kerneldriverfusewindowswindows-kernel
winfsp/hubfs
Mar 2021 - May 2022
File system for GitHub & GitLab
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 release, 277 commits, 290 pushes in 1 year 2 months
Contributions summary:Bill implemented a core back-end component for the file system, focusing on interaction with the GitHub API. They added the necessary functionality to authenticate against GitHub and interact with the REST API to fetch user and repository information. The user also made improvements to caching and organization of the retrieved data. The primary focus appears to be establishing the foundation for a Git-based file system interacting with GitHub's services.
git-addonsgitlabfilesystemfile-system
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.