Sijmen Mulder
Sr. Developer at Securify B.V.
Purmerend, North Holland, Netherlands
Summary
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SeniorSijmen Mulder is a curious, all-round senior developer with 13 years of experience building robust, portable backend systems from the Netherlands. Currently at Securify B.V., he focuses on pragmatic engineering and cross-platform compatibility, often diving into low-level issues that make software reliably portable across Unix-like systems. His open-source work includes meaningful fixes to prominent terminal tools like nnn and sc-im, where he tackled platform-specific build issues, buffer overflows, and missing system calls to broaden support for SmartOS and OpenBSD. Comfortable across systems and C-level tooling, he brings both deep technical troubleshooting skills and a preference for practical, long-lived fixes that reduce future maintenance.
13 years of coding experience
Stackoverflow
5,809reputation
985kreached
34answers
29questions
case-sensitive
top-5%
git
top-5%
objective-c
top-5%
nsarray
top-1%
Github Skills (33)
debug10
ncurses10
system-programming10
multiplatform10
terminal-emulator10
cross-platform10
c1110
terminal-application10
openbsd10
c1710
command-line10
nsarray10
git9
objective-c9
c-libraries9
Programming languages (13)
Github contributions (5)
jarun/nnn
Dec 2018 - Nov 2022
n³ The unorthodox terminal file manager
Role in this project:
Backend Developer & Systems Engineer
Backend Developer & Systems EngineerContributions:9 reviews, 18 commits, 16 PRs in 4 years
Contributions summary:Sijmen primarily focused on fixing bugs and improving the codebase's compatibility across various operating systems. Their contributions involved addressing compiler warnings related to signed/unsigned integer comparisons and fwrite errors. They also worked on resolving build issues on SmartOS by adding necessary definitions and adapting code for platform-specific limitations. Furthermore, the user addressed buffer overflows in the `strftime` function and replaced `dprintf()` calls with `fprintf()` or `write()` for broader platform support.
unicornsvimbatch-renamedeveloper-toolsmulti-platform
andmarti1424/sc-im
Jun 2018 - Dec 2019
sc-im - Spreadsheet Calculator Improvised -- An ncurses spreadsheet program for terminal
Role in this project:Back-end Developer
Back-end DeveloperContributions:13 commits, 9 PRs, 29 comments in 1 year 6 months
Contributions summary:Sijmen primarily focused on enhancing the software's compatibility and functionality, particularly concerning system dependencies and file handling. A significant contribution was the addition of code paths to support OpenBSD systems by addressing the absence of `wordexp()`. Other commits addressed missing calls to `wordexp()`, fixing typos and improving portability by replacing `strlcpy` with `memcpy`. These changes demonstrate a focus on improving the codebase's robustness and platform compatibility.
terminal-appvimconsolecalculatorconsole-application
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