"Guido is a thought leader in community building and developer relations. Any company serious about building an ecosystem should talk to him."
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.
21+
years building communities
500+
experiments run
207
events spoken at
28
countries presented in
Right now
via
Sifa ID
- Bluesky Post 2d ago
NLNet grants have an interesting new rule: "It is not allowed to use generative AI for producing artefacts of any kind, including code, design, and documentation." nlnet.nl/foundation/p... Well good luck with that in 2026
Open this Bluesky post in a new tab - Bluesky Post 6d ago
Big +1 for Zen
Open this Bluesky post in a new tab - Bluesky Post 6d ago
Found out that cal.eu (a 🇪🇺 service by cal.com) is shutting down 💀 at the end of the month, so... ...now selfhosing cal.rs for the scheduling 📅 and using meet.ffmuc.net for the video part 💪 DM me if you have something fun to talk about and I'll send you the link 😀 #FirstTimeRust
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- Bluesky Post 4h ago
Welkom Guus(je)! 🪿
Open this Bluesky post in a new tab - Bluesky Post 2d ago
I've reached the fine age of "need-to-take-my-glasses-off-to-read-something-closeby"
Open this Bluesky post in a new tab - Bluesky Post 1d ago
"if you look closely at this thing, you'll see it has a shape!" My kid is going places people
Open this Bluesky post in a new tab - Bluesky Post 16h ago
I see the #MozFest Fomo Days have started!
Open this Bluesky post in a new tab - Bluesky Post 3d ago
Seem accurate
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- Bluesky Post 5d ago
I think if I'd only eat my kids leftovers I'd be perfectly fine
Open this Bluesky post in a new tab - Bluesky Post 1h ago
@scarnecchia.net your website is broken 😥
Open this Bluesky post in a new tab - Bluesky Post 3h ago
@tangled.org know you guys are very busy these days and probably already know this but just in case: login is broken (for me at least) Good luck with all the changes and fixes! 💙
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- Bluesky Post 19h ago
Gheh 😅
0 Open this Bluesky post in a new tab - GitHub Pushed code 1d agoGitHub
- Smoke Signal Going 4d agoDWeb atproto.nl meetup: AtmosphereConf lookoutMar 24, 2027Open this Smoke Signal event in a new tab
- Smoke Signal Going 4d agoDWeb atproto.nl meetup: Preservation and data ownershipFeb 16, 2027Open this Smoke Signal event in a new tab
- Smoke Signal Going 4d agoDWeb atproto.nl meetup: New Year borrelJan 22, 2027Open this Smoke Signal event in a new tab
- Smoke Signal Going 4d agoDWeb atproto.nl meetup: SpacesDec 4, 2026Open this Smoke Signal event in a new tab
- Smoke Signal Going 4d agoFOSDEM 2027Jan 30, 2027Open this Smoke Signal event in a new tab
- Open this Popfeed review in a new tabPopfeed 1mo agoSiloTv show · Apple TV10/10
- Tangled Pushed code 1mo agoReads lag behind the web UI right after a writeOpen this Tangled code in a new tab
- Tangled Pushed code 1mo agoLook up issues/PRs by their #number, not just record-keyOpen this Tangled code in a new tab
- Tangled Pushed code 1mo agotest(ci): probe pull_request trigger (do not merge)Open this Tangled code in a new tab
- Tangled Pushed code 1mo ago2048.socialSimple atproto game, 2048 tiles with the avatars of your friendsOpen this Tangled code in a new tab
- Open this Bookhive review in a new tabBookhive 2mo agoWhy None Of My Books Are Available On Audible: And why Amazon owes me $3,218.55
- Open this Popfeed review in a new tabPopfeed 3mo agoFuturamaTv show · FOX8/10
- Open this Popfeed review in a new tabPopfeed 3mo agoGodzillaFilm · Roland Emmerich8/10
- Open this Popfeed review in a new tabPopfeed 3mo agoSugarTv show · Apple TV9/10
- Open this Popfeed review in a new tabPopfeed 3mo agoFinal SpaceTv show · Adult Swim10/10
- Open this Popfeed review in a new tabPopfeed 3mo agoPantheonTv show · Netflix10/10
- Open this Popfeed review in a new tabPopfeed 4mo agoSexistentialAlbum · Robyn8/10
- Open this Popfeed review in a new tabPopfeed 4mo agoDe vloek van PolyfemosBook · Evert Hartman9/10
- Tangled Pushed code 4mo agoFix sifa id logomark: replace Singi Labs mark with Sifa'sOpen this Tangled code in a new tab
- Open this Popfeed review in a new tabPopfeed 4mo agoLEAN STARTUP metodikaBook · Eric Ries7/10
- Open this Popfeed review in a new tabPopfeed 4mo agoThe Man from EarthFilm · Richard Schenkman10/10
- Open this Popfeed review in a new tabPopfeed 4mo agoThe Last of UsTv show · HBO9/10
- Tangled Pushed code 4mo agobsky-avatarDynamic avatar rotationOpen this Tangled code in a new tab
- Tangled Pushed code 6mo agoatproto-plc-counterAT Protocol PLC directory counterOpen this Tangled code in a new tab
- Tangled Pushed code 7mo agosifa-lexiconsAT Protocol lexicon schemas for Sifa professional profiles (id.sifa.*)Open this Tangled code in a new tab
- Tangled Pushed code 8mo agobarazo-workspacepnpm workspace root for Barazo forum development — shared configuration, tooling, and cross-package dependency managementOpen this Tangled code in a new tab
- Tangled Pushed code 8mo agobarazo-deployBarazo Docker Compose templates for self-hostingOpen this Tangled code in a new tab
- Tangled Pushed code 8mo agobarazo-lexiconsBarazo lexicon schemas and TypeScript typesOpen this Tangled code in a new tab
- Smoke Signal Going 8mo agoATmosphereConf 2026Mar 26, 2026Open this Smoke Signal event in a new tab
- Grain Photo Oct 2026Guus in his hut
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- Grain Photo Sep 2026For those who though I was joking about wearing clogs at @atmosphereconf.org: here's pict…
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- Grain Photo Sep 2026Amsterdam by night
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- Grain Photo Sep 2026It's @thealexlichter.com starting his Vite+ talk at the @vitest.dev x @npmx.dev meetups i…
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- Grain Photo Sep 2026lunchtime!
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- Grain Gallery · 2 photos Sep 2026Helsinki 🇫🇮
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- Grain Gallery · 10 photos Sep 2026Helsinki 🇫🇮
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- Grain Gallery · 5 photos Sep 2026Helsinki 🇫🇮
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Brands I've worked with
From retail to telecom to financial services, I've helped teams across industries build stronger communities.
freshly published
All articles Writing
207 talks, 28 countries
All talks Talks & speaking
From optimisation to ecosystem thinking
Talk · ATmosphere Conf · Vancouver, CA
Communities that matter to the business
Keynote · Meet Magento NL · Amsterdam, NL
The psychology of contribution
Keynote · DevRelCon · London, UK
Anti-fragile communities
Workshop · Spryker Excite · Berlin, DE
7 hard-learned lessons for reliable AI workflows
Talk · ProductTank · Amsterdam, NL
Proving the monetary value of A/B testing
Keynote · Conversion Hotel · Texel, NL
that's me the psychology edge Svitlana Kulynych Head of Learning Experience, Spryker
· worked with me at Spryker
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.
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.
kind words
What my colleagues say
Recommendation excerpts written by colleagues on LinkedIn
"Guido is an excellent public speaker who gives his audience practical tips on how to create a company culture that embraces evidence-based decision making."
"He has had a pivotal role in helping shape our CRO success platform Effective Experiments through detailed actionable feedback."
"From the very first moment, he welcomed me with his enthusiasm and passion for e-commerce, community, and the Spryker product."
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
Community strategy, DevRel leadership or running an event or conference, as an advisor or hands-on for 1–2 days a week. Typically 6–9 months.
Talk about a retainerEvent speaker
Keynotes and workshops at your conference, company event or developer meetup. 28 countries, 207 talks so far.
Invite me to speakor just send me a note · follow on Sifa ID