Timo Sirainen
Chief Architect at Open-Xchange
Helsinki, Finland
Summary
🤩
RockstarTimo Sirainen is a seasoned C and Linux systems architect with 23 years of experience, currently serving as Chief Architect at Open-Xchange in Helsinki. He is best known as the original author of widely used open-source projects Irssi and Dovecot and continues to focus on secure, protocol-level engineering—particularly IMAP and other Internet protocols. Timo blends hands-on systems programming with long-term product thinking, often treating paid work as fuel for his open-source pursuits; recent contributions include compatibility and low-level fixes to projects like mosh and libfaketime. Known for pragmatic, security-conscious C code and attention to platform quirks (e.g., forkpty/cfmakeraw and stat-like APIs), he brings deep expertise in portability and robustness across CPU architectures.
23 years of coding experience
Github Skills (16)
c1710
c-language10
system-programming10
c1110
cprogramming-language10
datetimes9
posix9
posixct9
datetime9
cross-platform8
system8
networking8
multiplatform8
sys8
wrapper8
Programming languages (10)
Github contributions (5)
wolfcw/libfaketime
Feb 2022 - Feb 2022
libfaketime modifies the system time for a single application
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 1 PR, 7 comments in 1 day
Contributions summary:Timo primarily focused on enhancing the `libfaketime` project by refactoring and implementing new features related to system time manipulation. Their commits involved renaming variables for clarity, fixing issues related to disabling stat-like function faking, and introducing macros to streamline the handling of stat-like functions. The contributions include adding fstat(), stat() and lstat() calls and leveraging macros to improve code organization and maintainability.
datetimeld-preloadreproducible-buildssingle-applicationintercept-calls
mobile-shell/mosh
Aug 2012 - Aug 2012
Mobile Shell
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 commits in 1 day
Contributions summary:Timo primarily contributed to the mobile-shell/mosh project by implementing and fixing compatibility issues. Their commits include adding fallback implementations for `forkpty()` and `cfmakeraw()` functions, removing non-standard code, fixing compiler issues, and addressing alignment problems for specific CPU architectures. The user also refactored the code by removing the `__STRING()` macro usage, streamlining code and compatibility.
shelllinuxandroid
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