Categories: 3d printing (14) arcade cabinet (6) arduino (2) backup (4) blogofile (4) dns (8) mailbox alert (62) making (12) projects (116) RAID (4) rants (24) raspberry pi (2) site (26) ultimaker (4)

Curriculum Vitae of Jelte Jansen

Personal Information

  • Name: Jelte Jansen
  • Nationality: Dutch



  • Hands-on experience in protocol and standards implementation

    • DNS, DNSSEC, TCP/IP, HTTP(s), AS2, AS4, PEPPOL, SMTP, S/MIME, PKCS#11, X509, XSD, Schematron
  • Experienced with the following Programming languages

    • C, C++, Go, Python, Perl, Java, Javascript, Lua


Smaller publications (blogs and non-reviewed articles) can be found on and

Employment History

  • 2018-present: Ionite

    • Description: Consultancy, technology development, and services regarding electronic invoicing
    • Function: Founder, Consultant
    • Tasks: Management, Consultancy, Protocol development, Software development
    • Specifics:
  • 2013-2023: Stichting Internet Domeinregistratie Nederland

    • Description: Foundation that administrates the .nl country-code top-level domain
    • Function: Research Engineer
    • Tasks: Technical Advisor, Internet protocol research and development
    • Specifics:
      • Technical project lead of SPIN
      • Technical project lead of SIDN Valibox
      • Involved in protocol design and standardization (IETF, RIPE)
      • Technical Lead SimplerInvoicing (SI-UBL and PEPPOL transport) (2017-2018)
      • Prototype Development for new protocols and services, this ranges from brand new services, such as the Domain name Surveillance system (, to extensions of the PEPPOL Transport network (
      • Member of the Privacy Board at SIDN, as a technical expert
      • Editor for Privacy & Informatie ( (2016-2018)
      • Program Committee Member for RIPE Meetings ( (2015-2017, 2018-2021)
      • Member of the Board of Advisors for SIDN Fund (
  • 2009-2013: Internet Systems Consortium

    • Description: Non-profit public benefit organization that produces and distributes quality Open Source software, and provides professional services based on that software.
    • Function: Software Engineer
    • Tasks: Software design, Software development, Protocol engineering, Scrum Master, member of Best Practices board
    • Specifics:
      • Design and development of the [](BIND 10) software.
      • Involved in standards work at the Internet Engineering Task Force
      • Scrum master. Since ISC is a very distributed company, with small teams consisting of people working all over the world, this involved applying the Scrum methodology as befits our team, which posed a unique set of challenges.
      • Represented my engineering team at a best practices board, where common practices from different teams were combined and formed into a set of company-wide best practices for software engineering.
  • 2004-2009: NLnet Labs

    • Description: Foundation to develop, implement, evaluate, and promote new protocols and applications for the Internet.
    • Function: Developer
    • Tasks: Research, development, protocol engineering, application testing, systems maintenance
    • Specifics:
      • One of the two original developers of the ldns DNS library, a C library to simplify DNS programming. It supports RFCs like the DNSSEC documents (RFC4033-4035). Apart from being a general library, this contains several specific tools, amongst which:
        • Simple Resolver and debugging tool (drill)
        • DNSSEC signer (ldns-signzone)
        • DNSSEC validator (drill)
        • DNS traffic analyzer (ldns-dpa)
        • DNSSEC zone walker (ldns-walk)
      • With ldns, created an example and interoperability testing implementation for the DNSSEC extension NSEC3 (
      • Involved in the creation and validation of several RFCs, most notably RFC4033-4035, RFC4648 and RFC5155.
      • Developer and maintainer of a second iteration of NLnet Labs’ and RIPE NCC’s DISTEL Testlab, a test setup for performance and regression testing of DNS authoritative servers. Created a way to do basic classifications of differences between server implementations. Reimplemented the control and configuration tools of the testlab in Python.
      • Provided assistance with the design and code reviews of NSD 3, an authoritative name server.
      • Provided assistance with the design and code reviews of Unbound, a validating recursive name server
      • Involved in the first iteration of the OpenDNSSEC software suite. Mainly responsible for the initial signing engine, and transparent abstraction from HSM devices.
  • 2000-2004: First8 B.V. (part-time)

    • Description: ICT Company specialized in creating inter- and intra-net applications
    • Function: Software Engineer
    • Tasks: Design and development of Java-based Internet applications
  • 1998-2000: InterNLnet B.V. (part-time)

    • Description: Internet Provider
    • Function: Helpdesk for an Internet provider.
    • Tasks: Provide technical help to customers with their network and Internet connections

Other Functions

  • 2019-2022: RIPE Programme Committee
    • Description: Planning and presentation selection for RIPE meetings
    • Function: Member
  • 2017-2023: SIDN Fonds Advisory Board
    • Description: Review project proposals and funding requests, general advice for SIDN Fonds
    • Function: Member
  • 2016-2018: Editor for Privacy & Informatie (
    • Description: Review submitted articles on Privacy in the information sector, write news and opinion articles
    • Function: Editor


  • High school: Gymnasium Beekvliet
  • University: University of Nijmegen (now known as Radboud University)
    • Master’s degree in Computing Science
    • Graduated on Security and Development
    • Aia Master award for master thesis Slicing Midlets


  • Several personal projects can be found on and
    • One notable personal project is Mailbox Alert (AMO link), an addon for Thunderbird with over 16.000 daily users.
  • 1999 - 2001: Chair of Thalia, the student association for Computing Science at the University of Nijmegen
  • 2000 - 2001: Treasurer of ‘Stichting Beet’, a student association encompassing the technology studies at the University of Nijmegen
  • 2001 - 2002: Chair of ‘Stichting Beet’