Seriously coding since the mid 90s. My early projects include:

• Writing the ALSA(9) driver layer for MPlayer, which is a software media player for POSIX platforms. ALSA is the audio driver layer of the Linux kernel. Succeding the former more simple driver layer called OSS: https://github.com/mpv-player/mpv/blob/master/audio/out/ao_alsa.c
• Writing CMS systems based on Plone/Zope: http://www.zope.org/