Guido X Jansen

Bullish on atproto 🏗️ sifa.id | barazo.forum | singi.dev 🪿 * 20+ years community building (Joomla!, Magento, Spryker, CRO.CAFE) * Cognitive Psychologist turned DevRel * Open source & automation enthusiast * Former competitive swimmer 🏊‍♂️ 🇪🇺 🇳🇱 👨‍👩‍👦‍👦 🏡 gui.do

2353 followers5144 following50 stories

Longform Stories

Outsource your GitHub CI to a VPS: cheaper, faster, and a free backup server too

Self-hosted GitHub Actions runners on a small Hetzner VPS cut my CI wall-clock from ~12 minutes to ~3 minutes for about half the price of the GitHub-hosted minutes I was burning. Here's the full setup…

3d ago·14 min read·2623 words

Make links to your blog render the custom "View publication" card + CTA

Short guide. The mechanism is simpler than it looks, and it doesn't involve any /.well-known file or DNS TXT record.

4d ago·9 min read·1725 words

ATmosphere Conf 2026: the internet built for people, not platforms

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.

Mar 31·3 min read·537 words

Running Doom over the 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.

Mar 30·11 min read·2024 words

AI slop is drowning communities. Verifiable track records can fix it.

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.

Mar 6·13 min read·2441 words

Barazo: community forums where members own their data

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.

Feb 14·7 min read·1280 words

Better Not Waste It

A story about token limits, AI companions, and the sunk cost of unused mana.

Feb 4·5 min read·960 words

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.

Jan 5·5 min read·923 words

A practical guide to building your own 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.

Dec 4·6 min read·1196 words

Start building Anti-Fragile communities, your community deserves it

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 …

Oct 29·12 min read·2297 words

Ditching "One community idea per month": Our hackathon path to 80+ community projects

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…

Oct 16·10 min read·1855 words

How I reduced my BigTech dependencies in 2025 (and why you should too)

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.

Oct 1·10 min read·1940 words

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.

Sep 4·3 min read·436 words

7 Hard-(l)earned lessons for building reliable AI workflows

Practical insights and lessons learned from building and deploying AI workflows in production environments.

Jun 8·5 min read·855 words

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.

Feb 26·7 min read·1212 words

Concerns with AI programming

An analysis of the potential challenges and concerns surrounding AI in software development over the medium to long term.

Jan 24·3 min read·479 words

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.

Jan 10·4 min read·734 words

Website moved to Astro

After almost 7 years, it was time for another switch: Moved the website from Webflow to Astro.

Dec 31·2 min read·292 words

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.

Apr 24·4 min read·719 words

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.

Mar 19·3 min read·433 words

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.

May 28·6 min read·1060 words

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.

Feb 12·17 min read·3325 words

Often Confused Commerce Terms

Let's set the record straight about some often mixed up terms in commerce

Mar 15·9 min read·1752 words

Optimization hierarchy of evidence

A CRO/Experimentation variant of the scientific hierarchy of evidence

Aug 10·1 min read·83 words

Are you LEFT or RIGHT brain? Surprise: you're both

>-

Jul 9·1 min read·11 words

The Story of Spryker with CEO Boris Lokschin

Building the commerce platform of the future

Dec 23·2 min read·284 words

First episode of CRO.CAFÉ is live!

>-

Jan 7·1 min read·111 words

Recording: Creating An Optimization Culture

Recording of my session about creating an optimization culture

Oct 23·1 min read·49 words

Website moved to Webflow

Amazing new visual SaaS CMS system!

Feb 15·1 min read·27 words

Can you afford not to know? Can you afford to be wrong?

>-

Jan 22·3 min read·449 words

Texas sharpshooter fallacy

>-

Dec 11·4 min read·638 words

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.

Oct 24·2 min read·390 words

New domain and CMS!

Switched to gui.do and Grav CMS

Oct 5·1 min read·78 words

Questions on Experimentation

Designing great experiments

Sep 20·2 min read·281 words

Learnings from Shenzhen

Some (random) notes/learnings from my trip to Shenzhen China

Sep 3·3 min read·453 words

Proving the monetary value of A/B testing

>-

Jul 28·6 min read·1089 words

The CRO Process

White-paper on the CRO Process

Feb 6·3 min read·493 words

Intervju: Guido Jansen ska ta reda på varför kunderna inte handlar

This is a re-post of an interview with me by the Swedish magazine eHandel

Mar 21·6 min read·1007 words

Combining personal & business online: 5 guidelines/tips.

>-

Dec 17·4 min read·775 words

Compute required Sample Size for your A/B tests

Google Sheet calculator for your AB test sample size

Oct 24·3 min read·418 words

Trustlogo onderzoek

Dutch Research towards e-commerce trust logo's

Jan 27·6 min read·1095 words

How Color Persuasion Works

How to (not) use colors in your website

Nov 22·5 min read·897 words

One year .com in retrospect

One year ago, I moved my blog to a .com

Jul 19·2 min read·290 words

Persuasion profiling: Dawn of a New Marketing Era

PersuasionAPI: A new tool that makes your website much more persuasive

May 29·2 min read·396 words

Update: 101 ways to optimize Magento for speed

Guess Magento and it's speed is a hot issue :).

Jun 1·1 min read·187 words

101 ways to speed up your Magento e-commerce website

Let's optimize your webshop for speed!

May 18·11 min read·2055 words

Top 8.5 tips for getting started in ecommerce

>-

Jan 4·5 min read·888 words

9.999 on 09.09.09 09:09

Fun coincidence!

Sep 9·1 min read·102 words

New Website Online

Created a new website based on Mambo CMS

Dec 30·3 min read·572 words

Website Online

My first personal website!

Feb 8·1 min read·153 words