Stefan Tobias Walter
http://stef.thewalter.net/
stef@thewalter.net
+1 505 926 1827
Expert developer and project manager with over 10 years of development and project management
experience. Significant involvement with open source contributions and projects.
Able to draw on extensive experience to find best and most cost effective solution to problem at hand. Keen
interest in mastering and contributing to new technologies. Self motivated, takes initiative to add value to
your organization, and is committed to delivering quality work.
Technical Skills
Languages: C, C++, Java, Javascript, PHP, Python, shell scripting, SQL, Vala, VBA, X86 assembly
Markup: Docbook, HTML, CSS, RTF, SGML, XML, XSLT
Databases: Document/XML databases, graph databases, MySQL, PostgreSQL, LDAP, RDF, SQL Server
Operating Systems: FreeBSD, Linux, Windows
Platforms: GObject, GNOME, GTK+, Mozilla, Posix, Unix, Win32
Networking and Protocols: 802.11a, D-Bus, DNS, DNS-SD, IMAP, firewalls, high availability, HTTP, OSI,
OSPF, routing, SNMP, SMTP, sockets, TCP/IP, tunnelling, VPN
Security: ASN.1, DER, IPSEC, OpenID, PKCS#11, PKI, SSO, SSL/TLS, X.509, VPN
Project Management: Bugzilla, CVS, Git, internationalization, Subversion, Trac, Unicode
Open Source
GNOME: Module Maintainer and Foundation Member




Maintainer of gnome-keyring and seahorse modules.
Also contributed to GTK+ and several other projects.
Well versed in GObject and various other GTK+ and Glib technology.
Spoke at GUADEC 2010 about gnome-keyring and the crypto storage in GNOME.
Other Open Source Contributions





2004 – present
2000 – present
FreeBSD: kernel patches for networking, IPSEC, USB, virtualization
Mozilla Firefox: layout enhancements and bug fixes
PostgreSQL: enhancements to access control
OpenLDAP: bug fixes
... and other projects.
Some of My Open Source Projects





RRDbot: an SNMP polling daemon, used in at least one commercial firewall device
ClamSMTP: anti-virus mail proxy using ClamAV
Scrounge NTFS: data recovery for corrupted NTFS file systems
PKCS#11 Test: module test suite
... and many others.
Page 1 of 3
Research and Standards



Secret Service API: Co-author of Free Desktop specification
PKCS#11 URI's: Contributor to IETF RFC Draft
PKCS#11 Trust Assertions: In progress, author of IETF BCP Draft
Professional Experience
Family Mission Critical: System and Network Architect
2004 – present
Amsterdam, Netherlands / Guadalajara, Mexico / Other locations






Applying open source solutions to real world needs, and adapting software as necessary.
Network development including: kernel, monitoring, sockets, security.
Involved in contracts and procuring of networking resources, equipment, colocation and IP transit.
Build-out of systems and racks in various data centers.
Managing a team of system administrators.
Development and deployment of: low overhead virtualization, high availability, firewalls, etc.
The Family International: Development Project Manager
2006 – 2010
Guadalajara, Mexico








Led development of a single-sign-on system based on OpenID using Python and Django.
Development of an XUL, Javascript, and RDF based evaluation/survey app and web service.
Led development, research, and deployment of a PKI (public key infrastructure) using Python.
Led complex projects to match time and resource constraints.
Experience with distributed version control used for development and code review.
Coordinated feature specifications and expectations with clients.
Used unit testing, test coverage, bug tracking to help team build robust software.
Developed a custom client application for a NoSQL database using graph databases and gtkmm.
The Family International: Network Architect
2005-2006
Guadalajara, Mexico





Surveyed, built, and installed a network of wireless point to point links over a wide area.
Used open source software to build embedded systems for radio links.
Deep understanding of TCP/IP, routing protocols, tunneling, traffic monitoring.
Designed, developed, and deployed a dynamic multi-point VPN for connecting offices based on
OpenVPN, OSPF and custom mesh addressing software.
Research and development of cost effective networking alternatives.
World Services: Developer





2001 – 2005
Implemented XML document storage database.
Developed RTF to XML document conversion tools.
Developed application to watermark copyrighted media.
Designed and implemented an LDAP based authentication system used by multiple protocols.
Built a file storage and transfer website using Python and ProFTP.
Personal

German national with a native speaker's command of English.
Page 2 of 3




Diploma from Christian Vocational College, Thailand (2000)
National Association of the Blind, India: Volunteered for aid concerts, graphic designer.
Volunteered to help with Drug Awareness Campaigns in Thailand.
Pro-bono work for aid organizations and missionaries.
Page 3 of 3