Building technical ecosystems that create real business value. I build community functions - the strategy, the systems, and the teams to run them.https://gui.do/en-usoptimization,psychology,cro,uxTechnologyhttps://gui.do/post/atmosphere-conf-2026/https://gui.do/post/atmosphere-conf-2026/370 people in Vancouver, 500 online, all working on the same question: what does the internet look like when users own their data? Highlights from the AT Protocol community conference.Tue, 31 Mar 2026 00:00:00 GMT370 people in Vancouver, 500 online, all working on the same question: what does the internet look like when users own their data? Highlights from the AT Protocol community conference.TechnologyAT ProtocolCommunityOpen Sourcegxjansenhttps://gui.do/post/doom-over-at-protocol/https://gui.do/post/doom-over-at-protocol/Every keystroke becomes a record. Every frame becomes a blob. A technical walkthrough of making the AT Protocol do something it was never designed for.Mon, 30 Mar 2026 00:00:00 GMTEvery keystroke becomes a record. Every frame becomes a blob. A technical walkthrough of making the AT Protocol do something it was never designed for.TechnologyAT Protocolgxjansenhttps://gui.do/post/ai-slop-reputation/https://gui.do/post/ai-slop-reputation/AI-generated junk content is flooding every community platform. Traditional moderation can't keep up. Portable, cross-platform contribution history is a structural fix that addresses the root cause.Fri, 06 Mar 2026 00:00:00 GMTAI-generated junk content is flooding every community platform. Traditional moderation can't keep up. Portable, cross-platform contribution history is a structural fix that addresses the root cause.AICommunityOpen Sourcegxjansenhttps://gui.do/post/introducing-barazo-community-forums/https://gui.do/post/introducing-barazo-community-forums/I'm building an open source forum platform on the AT Protocol. Members log in with their Bluesky account, posts live on their own data server, and reputation follows them across communities.Sat, 14 Feb 2026 00:00:00 GMTI'm building an open source forum platform on the AT Protocol. Members log in with their Bluesky account, posts live on their own data server, and reputation follows them across communities.CommunityOpen SourceDevRelgxjansenhttps://gui.do/post/better-not-waste-it/https://gui.do/post/better-not-waste-it/A story about token limits, AI companions, and the sunk cost of unused mana.Wed, 04 Feb 2026 00:00:00 GMTA story about token limits, AI companions, and the sunk cost of unused mana.AIFictiongxjansenhttps://gui.do/post/bigtech-independence-update-cleaning-house-for-local-ai/https://gui.do/post/bigtech-independence-update-cleaning-house-for-local-ai/Three months after my original BigTech independence article, here's what changed and why I'm building infrastructure for local AI.Mon, 05 Jan 2026 00:00:00 GMTThree months after my original BigTech independence article, here's what changed and why I'm building infrastructure for local AI.PrivacyOpen SourceTechnologySelf-hostedAIgxjansenhttps://gui.do/post/practical-guide-to-building-antifragile-tech-stack/https://gui.do/post/practical-guide-to-building-antifragile-tech-stack/Seven principles for evaluating technology choices, reducing vendor lock-in, and building a more resilient digital setup. The decision-making framework behind the tools.Thu, 04 Dec 2025 00:00:00 GMTSeven principles for evaluating technology choices, reducing vendor lock-in, and building a more resilient digital setup. The decision-making framework behind the tools.PrivacyOpen SourceTechnologygxjansenhttps://gui.do/post/start-building-anti-fragile-communities/https://gui.do/post/start-building-anti-fragile-communities/Over 20 years building communities around open-source platforms, I've watched a pattern repeat. Communities feel invincible until the moment they collapse. Learn how to build anti-fragile communities that gain strength from change instead of breaking under stress.Wed, 29 Oct 2025 00:00:00 GMTOver 20 years building communities around open-source platforms, I've watched a pattern repeat. Communities feel invincible until the moment they collapse. Learn how to build anti-fragile communities that gain strength from change instead of breaking under stress.CommunityDevRelOpen Sourcegxjansenhttps://gui.do/post/ditching-one-community-idea-per-month/https://gui.do/post/ditching-one-community-idea-per-month/Learn how we transformed community engagement through hackathons instead of monthly idea quotas, creating 80+ community projects while building better understanding between community and product teams.Thu, 16 Oct 2025 00:00:00 GMTLearn how we transformed community engagement through hackathons instead of monthly idea quotas, creating 80+ community projects while building better understanding between community and product teams.CommunityDevRelProduct Managementgxjansenhttps://gui.do/post/how-i-reduced-my-bigtech-dependencies-in-2025/https://gui.do/post/how-i-reduced-my-bigtech-dependencies-in-2025/A detailed guide on moving away from vendor lock-in and Big Tech subscriptions to build a more robust, privacy-friendly, and antifragile tech setup using open source alternatives.Wed, 01 Oct 2025 00:00:00 GMTA detailed guide on moving away from vendor lock-in and Big Tech subscriptions to build a more robust, privacy-friendly, and antifragile tech setup using open source alternatives.PrivacyOpen SourceTechnologygxjansenhttps://gui.do/post/rpi-pirate-audio-side-project/https://gui.do/post/rpi-pirate-audio-side-project/Building a custom audio project with Raspberry Pi and Pirate Audio hardware - a fun side project exploring hardware and software integration.Thu, 04 Sep 2025 00:00:00 GMTBuilding a custom audio project with Raspberry Pi and Pirate Audio hardware - a fun side project exploring hardware and software integration.HardwareDevelopmentgxjansenhttps://gui.do/post/7-hard-learned-lessons-for-building-reliable-ai-workflows/https://gui.do/post/7-hard-learned-lessons-for-building-reliable-ai-workflows/Practical insights and lessons learned from building and deploying AI workflows in production environments.Sun, 08 Jun 2025 00:00:00 GMTPractical insights and lessons learned from building and deploying AI workflows in production environments.AIDevelopmentgxjansenhttps://gui.do/post/the-collapse-of-traditional-commerce-why-innovation-is-no-longer-optional/https://gui.do/post/the-collapse-of-traditional-commerce-why-innovation-is-no-longer-optional/Explore how traditional commerce models are being disrupted and why businesses must innovate to survive in the rapidly evolving landscape of global commerce.Wed, 26 Feb 2025 00:00:00 GMTExplore how traditional commerce models are being disrupted and why businesses must innovate to survive in the rapidly evolving landscape of global commerce.CommerceBusinessInnovationgxjansenhttps://gui.do/post/mid-to-long-term-concerns-with-ai-programming/https://gui.do/post/mid-to-long-term-concerns-with-ai-programming/An analysis of the potential challenges and concerns surrounding AI in software development over the medium to long term.Fri, 24 Jan 2025 00:00:00 GMTAn analysis of the potential challenges and concerns surrounding AI in software development over the medium to long term.AIDevelopmentgxjansenhttps://gui.do/post/4-options-to-customize-your-llm/https://gui.do/post/4-options-to-customize-your-llm/Explore four great ways to customize Large Language Models for your specific use case, from prompt engineering to fine-tuning and RAGs & MCPs.Fri, 10 Jan 2025 00:00:00 GMTExplore four great ways to customize Large Language Models for your specific use case, from prompt engineering to fine-tuning and RAGs & MCPs.AIDevelopmentgxjansenhttps://gui.do/post/website-moved-to-astro/https://gui.do/post/website-moved-to-astro/After almost 7 years, it was time for another switch: Moved the website from Webflow to Astro.Tue, 31 Dec 2024 00:00:00 GMTAfter almost 7 years, it was time for another switch: Moved the website from Webflow to Astro.Website Updategxjansenhttps://gui.do/post/the-art-of-clear-messaging-at-trade-shows-what-we-can-learn-from-food-trucks/https://gui.do/post/the-art-of-clear-messaging-at-trade-shows-what-we-can-learn-from-food-trucks/How food trucks master clear, instant communication and what trade show exhibitors can learn from their approach to messaging.Wed, 24 Apr 2024 00:00:00 GMTHow food trucks master clear, instant communication and what trade show exhibitors can learn from their approach to messaging.BusinessMarketinggxjansenhttps://gui.do/post/beyond-code-software-developers-in-the-age-of-ai/https://gui.do/post/beyond-code-software-developers-in-the-age-of-ai/Exploring how software developers can adapt and thrive in an era where AI is transforming the development landscape.Tue, 19 Mar 2024 00:00:00 GMTExploring how software developers can adapt and thrive in an era where AI is transforming the development landscape.AIDevelopmentgxjansenhttps://gui.do/post/why-every-moment-looks-like-a-turning-point-in-exponential-growth/https://gui.do/post/why-every-moment-looks-like-a-turning-point-in-exponential-growth/Discover why exponential growth charts can be misleading and why "today" isn't a special turning point despite what many trend analyses suggest.Sun, 28 May 2023 00:00:00 GMTDiscover why exponential growth charts can be misleading and why "today" isn't a special turning point despite what many trend analyses suggest.DataGrowthAnalysisgxjansenhttps://gui.do/post/how-to-build-an-online-b2b-community/https://gui.do/post/how-to-build-an-online-b2b-community/Learn how to create and maintain a successful B2B community, overcome unique challenges, and leverage the benefits for your business growth and customer engagement.Sun, 12 Feb 2023 00:00:00 GMTLearn how to create and maintain a successful B2B community, overcome unique challenges, and leverage the benefits for your business growth and customer engagement.CommunityBusinessB2Bgxjansenhttps://gui.do/post/often-confused-commerce-terms/https://gui.do/post/often-confused-commerce-terms/Let's set the record straight about some often mixed up terms in commerceTue, 15 Mar 2022 00:00:00 GMTLet's set the record straight about some often mixed up terms in commerceOpen SourceSprykergxjansenhttps://gui.do/post/optimization-hierarchy-of-evidence/https://gui.do/post/optimization-hierarchy-of-evidence/A CRO/Experimentation variant of the scientific hierarchy of evidenceMon, 10 Aug 2020 00:00:00 GMTA CRO/Experimentation variant of the scientific hierarchy of evidenceExperimentationgxjansenhttps://gui.do/post/are-you-left-or-right-brain-surprise-youre-both/https://gui.do/post/are-you-left-or-right-brain-surprise-youre-both/You've probably heard about this divide between the functions of the Left Brain versus the Right Brain. There is no divide.Thu, 09 Jul 2020 00:00:00 GMTYou've probably heard about this divide between the functions of the Left Brain versus the Right Brain. There is no divide.Psychologygxjansenhttps://gui.do/post/the-story-of-spryker-with-ceo-boris-lokschin/https://gui.do/post/the-story-of-spryker-with-ceo-boris-lokschin/Building the commerce platform of the futureMon, 23 Dec 2019 00:00:00 GMTBuilding the commerce platform of the futureSprykergxjansenhttps://gui.do/post/first-episode-of-cro-cafe-is-live/https://gui.do/post/first-episode-of-cro-cafe-is-live/As announced in November I would be starting a new (Dutch) podcast series this year about CRO. Today the first episode launched!Mon, 07 Jan 2019 00:00:00 GMTAs announced in November I would be starting a new (Dutch) podcast series this year about CRO. Today the first episode launched!PodcastExperimentationgxjansenhttps://gui.do/post/recording-creating-an-optimization-culture/https://gui.do/post/recording-creating-an-optimization-culture/Recording of my session about creating an optimization cultureTue, 23 Oct 2018 00:00:00 GMTRecording of my session about creating an optimization cultureVideogxjansenhttps://gui.do/post/website-move-to-webflow/https://gui.do/post/website-move-to-webflow/Amazing new visual SaaS CMS system!Thu, 15 Feb 2018 00:00:00 GMTAmazing new visual SaaS CMS system!Website Updategxjansenhttps://gui.do/post/can-you-afford-not-to-know-can-you-afford-to-be-wrong/https://gui.do/post/can-you-afford-not-to-know-can-you-afford-to-be-wrong/How far do you go? What do you test? And is it sometimes ok NOT to test something?Mon, 22 Jan 2018 00:00:00 GMTHow far do you go? What do you test? And is it sometimes ok NOT to test something?StatisticsExperimentationPsychologygxjansenhttps://gui.do/post/texas-sharpshooter-fallacy/https://gui.do/post/texas-sharpshooter-fallacy/To help remember statistical constructs I've started telling stories about statistics and the first one is about the Texas SharshooterMon, 11 Dec 2017 00:00:00 GMTTo help remember statistical constructs I've started telling stories about statistics and the first one is about the Texas SharshooterStatisticsExperimentationPsychologygxjansenhttps://gui.do/post/data-driven-decisions-meets-psychology/https://gui.do/post/data-driven-decisions-meets-psychology/On October 24th, I gave a session at Nomad Mage about using psychology and data to make the decisions to improve your webshop.Tue, 24 Oct 2017 00:00:00 GMTOn October 24th, I gave a session at Nomad Mage about using psychology and data to make the decisions to improve your webshop.Psychologygxjansenhttps://gui.do/post/new-domain-and-cms/https://gui.do/post/new-domain-and-cms/Switched to gui.do and Grav CMSThu, 05 Oct 2017 00:00:00 GMTSwitched to gui.do and Grav CMSWebsite Updatesgxjansenhttps://gui.do/post/questions-on-experimentation/https://gui.do/post/questions-on-experimentation/Designing great experimentsWed, 20 Sep 2017 00:00:00 GMTDesigning great experimentsExperimentationgxjansenhttps://gui.do/post/learnings-from-shenzhen/https://gui.do/post/learnings-from-shenzhen/Some (random) notes/learnings from my trip to Shenzhen ChinaSun, 03 Sep 2017 00:00:00 GMTSome (random) notes/learnings from my trip to Shenzhen ChinaTravelgxjansenhttps://gui.do/post/proving-the-monetary-value-of-a-b-testing/https://gui.do/post/proving-the-monetary-value-of-a-b-testing/How to go from “4% conversion uplift” to “€636K — €854K extra profit this year”Fri, 28 Jul 2017 00:00:00 GMTHow to go from “4% conversion uplift” to “€636K — €854K extra profit this year”Experimentationgxjansenhttps://gui.do/post/the-cro-process/https://gui.do/post/the-cro-process/White-paper on the CRO ProcessMon, 06 Feb 2017 00:00:00 GMTWhite-paper on the CRO ProcessExperimentationgxjansenhttps://gui.do/post/intervju-guido-jansen-ska-ta-reda-pa-varfor-kunderna-inte-handlar/https://gui.do/post/intervju-guido-jansen-ska-ta-reda-pa-varfor-kunderna-inte-handlar/This is a re-post of an interview with me by the Swedish magazine eHandelMon, 21 Mar 2016 00:00:00 GMTThis is a re-post of an interview with me by the Swedish magazine eHandelInterviewgxjansenhttps://gui.do/post/personal-brand-combining-personal-business-online-5-guidelinestips/https://gui.do/post/personal-brand-combining-personal-business-online-5-guidelinestips/My 5 tips on building your personal brand by having a healthy personal + business presence on your social media channels.Thu, 17 Dec 2015 00:00:00 GMTMy 5 tips on building your personal brand by having a healthy personal + business presence on your social media channels.Brandinggxjansenhttps://gui.do/post/compute-required-sample-size-for-your-ab-tests/https://gui.do/post/compute-required-sample-size-for-your-ab-tests/Google Sheet calculator for your AB test sample sizeSat, 24 Oct 2015 00:00:00 GMTGoogle Sheet calculator for your AB test sample sizeExperimentationgxjansenhttps://gui.do/post/trustlogo-onderzoek/https://gui.do/post/trustlogo-onderzoek/Dutch Research towards e-commerce trust logo'sFri, 27 Jan 2012 00:00:00 GMTDutch Research towards e-commerce trust logo'sResearchgxjansenhttps://gui.do/post/color-persuasion/https://gui.do/post/color-persuasion/How to (not) use colors in your websiteTue, 22 Nov 2011 00:00:00 GMTHow to (not) use colors in your websitePersuasiongxjansenhttps://gui.do/post/one-year-com-in-retrospect/https://gui.do/post/one-year-com-in-retrospect/One year ago, I moved my blog to a .comTue, 19 Jul 2011 00:00:00 GMTOne year ago, I moved my blog to a .comWebsite Updategxjansenhttps://gui.do/post/persuasion-profiling-dawn-of-a-new-marketing-era/https://gui.do/post/persuasion-profiling-dawn-of-a-new-marketing-era/PersuasionAPI: A new tool that makes your website much more persuasiveSun, 29 May 2011 00:00:00 GMTPersuasionAPI: A new tool that makes your website much more persuasivetoolsPersuasiongxjansenhttps://gui.do/post/optimize-magento-for-speed/https://gui.do/post/optimize-magento-for-speed/Guess Magento and it's speed is a hot issue :). Tue, 01 Jun 2010 00:00:00 GMTGuess Magento and it's speed is a hot issue :). Magentogxjansenhttps://gui.do/post/101-ways-to-speed-up-your-magento-e-commerce-website/https://gui.do/post/101-ways-to-speed-up-your-magento-e-commerce-website/Let's optimize your webshop for speed!Tue, 18 May 2010 00:00:00 GMTLet's optimize your webshop for speed!Magentogxjansenhttps://gui.do/post/top-tips-for-getting-started-in-ecommerce/https://gui.do/post/top-tips-for-getting-started-in-ecommerce/For business owners that have a retail store or a complete new business model but have little to no experience in the e-commerce field: this post is for you.\Mon, 04 Jan 2010 00:00:00 GMTFor business owners that have a retail store or a complete new business model but have little to no experience in the e-commerce field: this post is for you.\E-commercegxjansenhttps://gui.do/post/999999999/https://gui.do/post/999999999/Fun coincidence!Wed, 09 Sep 2009 00:00:00 GMTFun coincidence!gxjansenhttps://gui.do/post/nieuwe-website-online/https://gui.do/post/nieuwe-website-online/Created a new website based on Mambo CMSThu, 30 Dec 2004 00:00:00 GMTCreated a new website based on Mambo CMSWebsite Updatesgxjansenhttps://gui.do/post/website-online/https://gui.do/post/website-online/My first personal website!Thu, 08 Feb 2001 00:00:00 GMTMy first personal website!Website Updategxjansen