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Hi, I'm Guido 👋

I build community functions for tech products.

For 21+ years I've helped tech teams turn developer & customer intelligence into product strategy, grounded in cognitive psychology and a habit of testing my assumptions. I help build communities, and the teams that run them.

Work with me Invite me to speak Follow me on Sifa ID (opens in new tab)
21+
years building communities
500+
experiments run
188
events spoken at
27
countries presented in
Right now via Sifa ID
See what I’m up to

Brands I've worked with

From retail to telecom to financial services, I've helped teams across industries build stronger communities.

ANWB logo
Bol.com logo
Canal Digital logo
eBay logo
Euroflorist logo
Favorite Gifts logo
Heineken logo
Helly Hansen logo
ING logo
KPN logo
O'Neal logo
Randstad logo
Sanoma logo
Sara Lee logo
T-Mobile logo
freshly published

Writing

All articles
AT ProtocolIdentity

Your identity isn't your username

Your username is a label; your identity is a key you own. atproto splits who you are from what you're called, so you can rename freely, prove who you are with a domain you control, and carry one identity across the apps you use. Part of 'Apps as Views, Not Vaults': the things you make are yours; apps are just the viewers.

Jul 1, 2026 9 min Read
AT ProtocolCommunity

Who actually owns your network?

Jun 25, 2026 8 min
TechnologyDevOps

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

Jun 1, 2026 11 min
TechnologyAT Protocol

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

May 31, 2026 10 min
188 talks, 27 countries

Talks & speaking

All talks
From optimisation to ecosystem thinking
Talk · ATmosphere Conf · Vancouver, CA
2026
Communities that matter to the business
Keynote · Meet Magento NL · Amsterdam, NL
2025
The psychology of contribution
Keynote · DevRelCon · London, UK
2025
Anti-fragile communities
Workshop · Spryker Excite · Berlin, DE
2024
7 hard-learned lessons for reliable AI workflows
Talk · ProductTank · Amsterdam, NL
2025
Proving the monetary value of A/B testing
Keynote · Conversion Hotel · Texel, NL
2024
Guido X Jansen that's me
the psychology edge

Why this approach works

I lean on two things that don't always sit together: a cognitive-psychology read on how developers and customers actually behave, and an experimentation habit (those 500+ A/B tests at Randstad & JDE) to check what works instead of guessing. I'm still learning, mostly in the open.

Cognitive psychology
Why developers and customers actually behave the way they do.
Business experimentation
500+ A/B tests at Randstad & JDE. Measure what matters, prove what works.
Community building
Helped grow the Joomla!, Magento, CRO.CAFE and Spryker communities.
(AI) automation
Reliable AI workflows and local-first tooling that earns its keep.
Guido has a rare ability to translate community insights into tangible business intelligence, and to bring the business closer to the community.
Svitlana Kulynych Head of Learning Experience, Spryker · worked with me at Spryker
things I'm building

Projects

Sifa Building

Portable professional identity on AT Protocol. A track record built from real community contributions.
Barazo Building

Open-source community forums where members own their data. Log in with Bluesky; reputation follows you.
CRO.CAFE Hosting

200+ conversations on growth, experimentation & optimization. One of the longest-running CRO podcasts.
learn by building

Training

All training
For engineering teams of 5–12 · Workshop · in-company or cohort

Agentic Engineering

co-led with Execuro

Stop typing better prompts. Start delegating to AI agents that ship.

  • Delegate to AI agents with clear specs, context and rules instead of better prompts
  • Build a complete app together: frontend, backend and API, hands-on
  • Walk away with reusable agentic workflows and AI coding rulesets you keep
Find out more
Beginner / intermediate · Workshop · half or full day

Intro to Building on AT Protocol

Open social tech for developers

  • What AT Protocol actually is, and why it matters for your product
  • Set up a PDS, create records, wire a simple Bluesky client
  • How communities on open networks are different (and why that's an advantage)
Find out more
kind words

What my colleagues say

Recommendation excerpts written by colleagues on LinkedIn

"Guido is a thought leader in community building and developer relations. Any company serious about building an ecosystem should talk to him."
Boris Lokschin
Co-Founder & CEO • Spryker
CEO who hired me
"Guido consistently brought energy and openness, making it easy to connect on both professional topics and personal interests like AI and podcasting. He also excelled at connecting people across business and technology, turning community exchanges into actionable collaboration. Guido showed real leadership without ever being my manager, creating alignment and momentum simply by bringing people together."
Andreas Lummerzheim
Partner Manager • Shopware
Colleague in the same division, but different team
"Guido knows his area of expertise and wants to create long-term and meaningful optimization teams and culture in organizations."
Henrik Feld-Jakobsen
Chief Strategy Officer • Vaimo
Former manager
"I'm amazed at how quickly he adopts new technologies. For example, he rapidly mastered cutting-edge topics like Agentic Development, Vibe Coding, and workflow automation. Bringing this to Spryker resulted in higher efficiency and quicker improvements, lowering our TCO."
Christian von Schassen
Senior Director, Partner Success • Spryker
Leadership peer
View the full, 80+ recommendations on my LinkedIn profile (login required)
let's make something

Work with me

A handful of engagements each year. Pick the format that fits what you're trying to achieve.

Retainer

Ongoing community strategy, DevRel leadership or fractional community-function work. Typically 1–2 days/week over 3–6 months.

Talk about a retainer

Training

Bespoke in-company workshops on Agentic Engineering or Building on AT Protocol. Public cohorts run a few times a year.

Book a training

Event speaker

Keynotes and workshops at your conference, company event or developer meetup. 27 countries, 188 talks so far.

Invite me to speak

or just send me a note · follow on Sifa ID