Sebastiaan Janssen

Sebastiaan Janssen

MVP × 1
  • 2011

umbraco

From fostering contributions to learning what makes our developer community tick ☑️, to hosting a weekly open coding session to making coffee ☕ for colleagues. I do it all. But I do need my kayak 🛶 sessions and live music 🎸too.

Featured

Activity over the last 12 months

  • Nov 2025: nothing
  • Dec 2025: 1 item
  • Jan 2026: nothing
  • Feb 2026: nothing
  • Mar 2026: 9 items
  • Apr 2026: 4 items
  • May 2026: 1 item
  • Jun 2026: 1 item
  • Jul 2026: 4 items
  • Aug 2026: 1 item
  • Sep 2026: 6 items
  • Oct 2026: 3 items
  • Nov 2026: 2 items

Timeline

Nov 2026

  1. Meet-ups:
    Umbraco Builders Day Umbraco Builders Day brings Umbraco community and HQ folks together for a relaxed day of building - helping each other shape ideas, get unstuck and find people to team up w · RSVP'd yes to
  2. Meet-ups:
    Umbraco Builders Day Umbraco Builders Day brings Umbraco community and HQ folks together for a relaxed day of building - helping each other shape ideas, get unstuck and find people to team up w · Attended

Oct 2026

  1. Packages:
    Released Hangfire dashboard for Umbraco v5.5.5
  2. Meet-ups:
    Umbraco Meetup (Copenhagen) Join us at Charlie Tango, Østerbro on **Thursday 22 October 2026, 16:30-20:xx** for an afternoon of Umbraco conversations, practical talks, food, and networking. Hosted by · Attended
  3. Meet-ups:
    Umbraco UK Conference - Pre-Party Umbraco London is hosting a small get-together before the [Umbraco UK Conference](https://2026.umbracofoundation.co.uk/), and you're invited! Whether you want to catch up w · Attended

Sep 2026

  1. Meet-ups:
    Dutch Umbraco Alliance Festival ORDER YOUR FREE TICKET HERE: [https://www.eventbrite.nl/e/dutch-umbraco-alliance-festival-tickets-1991350547092](https://www.eventbrite.nl/e/dutch-umbraco-alliance-festival · Attended
  2. Meet-ups:
    Umbraco Community Hour - Virtual Meetup The Umbraco Community Hour is a fortnightly virtual lunchtime meetup! There's no fixed agenda, just an hour to chat about anything Umbraco. So grab your lunch, log on to · Attended
  3. Social activity:
    RE: https://umbracocommunity.social/@24DaysInUmbraco/117201464455249005 I am SO looking forward to ... RE: https://umbracocommunity.social/@24DaysInUmbraco/117201464455249005 I am SO looking forward to seeing your (crazy?) ideas, interesting projects, creative thoughts and cryptic Umbraco puzzles again this year! If you did something, anything, you enjoyed very much this past year then I'd LOVE […] · bluesky
  4. Social activity:
    RE: https://umbracocommunity.social/@24DaysInUmbraco/117201464455249005 I am SO looking forward to ... · mastodon
  5. Meet-ups:
    Umbraco Meetup (Odense) Join us for the next Umbraco Meetup in Odense! We’re bringing the community **together** for an afternoon and evening filled with **insightful** **talks**, real-world case · Attended
  6. Meet-ups:
    Umbraco Community Hour - Virtual Meetup The Umbraco Community Hour is a fortnightly virtual lunchtime meetup! There's no fixed agenda, just an hour to chat about anything Umbraco. So grab your lunch, log on to · Attended

Aug 2026

  1. Meet-ups:
    Umbraco Meetup (Copenhagen) **An evening of Umbraco, snacks, dinner and knowledge-sharing** Come for the talks, stay for the food, leave with an idea or two you'll pretend you had all along. . **16: · Attended

Jul 2026

  1. Social activity:
    The end of an era: after 15+ years, I've switched off our.umbraco.com. I wrote up some of the story... The end of an era: after 15+ years, I've switched off our.umbraco.com. I wrote up some of the story, the karma, the spam wars and a few fond arguments https://community.umbraco.com/blog/2026/07/an-hour-on-our-one-last-time/ #Umbraco #H5YR Our. · bluesky
  2. Social activity:
    The end of an era: after 15+ years, I've switched off our.umbraco.com. I wrote up some of the stor... Attached: 1 image The end of an era: after 15+ years, I've switched off our.umbraco.com. I wrote up some of the story, the karma, the spam wars and a few fond arguments https://community.umbraco.com/blog/2026/07/an-hour-on-our-one-last-time/ #Umbraco #H5YR Our. · mastodon
  3. Packages:
    Released Hangfire dashboard for Umbraco v5.5.4 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco
  4. Packages:
    Released Hangfire dashboard for Umbraco v5.5.3 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco

Jun 2026

  1. Meet-ups:
    Umbraco Hackathon (Post-Codegarden) Join us for a post-Codegarden Umbraco Hackathon before heading home from Codegarden! **🚀 The Event** We’re gathering the community for three hours of focused, collaborati · RSVP'd yes to

May 2026

  1. Blog posts:
    Bootstrapping Umbraco ModelsBuilder on an empty site Fair warning: this post was written with Claude AI, and it's helpful! Here's the simple problem I seem to get myself into often: I have views that need a strongly typed model, but modelsbuilder hasn't put the models on disk so Umbraco completely fails to start. dotnet run just f… · blog

Apr 2026

  1. Social activity:
    If you're trying to get up to speed with Umbraco AI then this month's umbraCoffee has you covered! ... If you're trying to get up to speed with Umbraco AI then this month's umbraCoffee has you covered! A great walk through with @matt on everything that's new and upcoming in Umbraco AI. 📽️ Watch it here: https://www.youtube.com/live/uY9pZz5NHaQ?si=_ZDaegyWNkOyjyBo #Umbraco · bluesky
  2. Social activity:
    If you're trying to get up to speed with Umbraco AI then this month's umbraCoffee has you covered! ... Attached: 1 image If you're trying to get up to speed with Umbraco AI then this month's umbraCoffee has you covered! A great walk through with @matt@umbracocommunity.social on everything that's new and upcoming in Umbraco AI. 📽️ Watch it here: https://www.youtube.com/live/uY9pZz5NHaQ?si=_ZDaegy · mastodon
  3. Social activity:
    🚨 New DevRel Deep Dive dropped earlier this week! This week @lotte and me were joined by Head of C... 🚨 New DevRel Deep Dive dropped earlier this week! This week @lotte and me were joined by Head of CMS Andy Butland to talk about what is new and improved in Umbraco version 17.2 and 17.3. 📽️ Watch it here: https://youtu.be/nBEgfifIP0o?si=mKDEc5_ea770dsZW #Umbraco · bluesky
  4. Social activity:
    🚨 New DevRel Deep Dive dropped earlier this week! This week @lotte and me were joined by Head of ... Attached: 1 image 🚨 New DevRel Deep Dive dropped earlier this week! This week @lotte@umbracocommunity.social and me were joined by Head of CMS Andy Butland to talk about what is new and improved in Umbraco version 17.2 and 17.3. 📽️ Watch it here: https://youtu.be/nBEgfifIP0o?si=mKDEc5_ea770ds · mastodon

Mar 2026

  1. Packages:
    Released Hangfire dashboard for Umbraco v5.5.2
  2. Packages:
    Released Hangfire dashboard for Umbraco v5.5.1 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco
  3. Packages:
    Released Hangfire dashboard for Umbraco v5.2.1 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco
  4. Social activity:
    The Umbraco Spark conference is drawing to a close and it's been a brilliant edition again this year... The Umbraco Spark conference is drawing to a close and it's been a brilliant edition again this year. Great talks, record crowd, inspirational hackathon before, impeccable organisation.. am I using too many superlatives? 😇 #Umbraco · bluesky
  5. Social activity:
    The Umbraco Spark conference is drawing to a close and it's been a brilliant edition again this year... Attached: 4 images The Umbraco Spark conference is drawing to a close and it's been a brilliant edition again this year. Great talks, record attendance, impeccable organisation, inspirational hackathon before.. am I using too many superlatives? 😇 #Umbraco · mastodon
  6. Packages:
    Released Hangfire dashboard for Umbraco v5.5.0
  7. Packages:
    Released Hangfire dashboard for Umbraco v5.4.0 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco
  8. Packages:
    Released Hangfire dashboard for Umbraco v5.3.0 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco
  9. Blog posts:
    Setting Up a New Umbraco Package Dev Environment with Umbraco.AI This guide walks through setting up a new Umbraco package project called Umbraco.Community.AI.Woowoo that extends Umbraco.AI. Rather than starting from scratch with a blank solution, the goal is a proper package structure from day one: the right project layout, a frontend build… · blog

Dec 2025

  1. Packages:
    Released Hangfire dashboard for Umbraco v5.2.0 This installs Hangfire and a dashboard in Umbraco, the dashboard is secured and is only available for users with access to the Settings section of Umbraco

Apr 2025

  1. Blog posts:
    Running Umbraco sites in Docker, still on a Raspberry Pi in my closet at home · blog

Sep 2023

  1. Blog posts:
    How I run this very website on a Raspberry Pi in my closet at home · blog

Jul 2023

  1. Blog posts:
    Using JWT tokens to access an UmbracoApiController So far, JWT has been eluding me, I haven't had the time to look into them, I just knew they existed and worked by sending a header. Today, I was following a question from Navorski about using JWT authentication on an UmbracoApiController, I enjoyed the responses from Dennis who… · blog

Nov 2022

  1. Blog posts:
    Create a plain dotnet, routed API controller in Umbraco This is a very quick blog post, blink and you'll miss it! 😉 While building something the other day I suddenly had the need for a route that would output some JSON data. I didn't need anything from Umbraco, just some plain old (modern!) dotnet - yes this is for Umbraco 9+. I tho… · blog

Oct 2022

  1. Blog posts:
    TIL: mime types and static assets in Umbraco A few months ago I wrote a post about learnings from the Umbraco Discord that week and then.. it went quiet 😅 With the best of intentions to keep that series going, it turns out there's just not enough hours in the day! I have ideas though to open up the information from Discor… · blog

Sep 2022

  1. Blog posts:
    Debugging your custom website against the Umbraco source code Imagine this scenario: you're weeks into building a new website in Umbrco and encounter a bug. You step into Umbraco's source code (available through SourceLink) and you learn what's going on. Even better you spot the problem and you have a good idea of how to fix it! Now in the… · blog

May 2022

  1. Blog posts:
    Umbraco Discord wrap-up week 18 Every week I realize what a wealth of information gets shared in the Umbraco Discord and the many things I might want to look up again later, so I've started keeping a list! CORS How to modify CORS on Umbraco netcore, asks Sean. My teammate Paul has the answer: services.Configur… · blog

Mar 2022

  1. Blog posts:
    Using Hangfire to update Umbraco content · blog