Curriculum Vitae of Jelte Jansen

Personal Information

Name: Jelte Jansen
Nationality: Dutch

Profiles

LinkedIn: Jelte Jansen
Mastodon: @jelte@mastodon.nl
GitHub: tjeb
Website: tjeb.nl

Experience

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

Publications

Smaller publications (blogs and non-reviewed articles) can be found on ionite.net and tjeb.nl

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:
  - Advice and technical support for Simplerinvoicing, regarding AS2, PEPPOL, EN-16931, NLCIUS, SMP, SML
  - Advice and technical support for the NPa, regarding AS4, PEPPOL, EN-16931, NLCIUS, SMP, SML
  - Developed the NLCIUS Schematron validation files
  - Developed and maintains the NPa Peppol Test Tool
  - Developed and maintains the ion-SMP service
  - Developed and maintains the open source ion-docval validation software
  - Developed and maintained the NPa Senders Directory until it was decommissioned.
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 (www.sidn.nl/a/internet-security), to extensions of the PEPPOL Transport network (www.peppol.eu)
  - Member of the Privacy Board at SIDN, as a technical expert
  - Editor for Privacy & Informatie (www.uitgeverijparis.nl) (2016-2018)
  - Program Committee Member for RIPE Meetings (meetings.ripe.net) (2015-2017, 2018-2021)
  - Member of the Board of Advisors for SIDN Fund (https://www.sidnfonds.nl/excerpt/)
2009-2013: Internet Systems Consortium www.isc.org
- 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 [http://www.isc.org/bind10](BIND 10) software.
  - Involved in standards work at the Internet Engineering Task Force http://www.ietf.org
  - 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 NLnetLabs.nl
- 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 (http://www.rfc-editor.org/rfc/rfc5155.txt)
  - 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. www.first8.nl (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. www.internlnet.nl (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 (www.uitgeverijparis.nl)
- Description: Review submitted articles on Privacy in the information sector, write news and opinion articles
- Function: Editor

Education

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

Other

Several personal projects can be found on http://tjeb.nl/Projects and http://www.tjeb.nl/blog
- 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’