"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
189
events spoken at
27
countries presented in
Right now
via
Sifa ID
- Bluesky Post 4d ago
w000000000 🥳
Open this Bluesky post in a new tab - Bluesky Post 1d ago
Totally forgot about my 2nd Atprotoversary when I was in Helsinki for Rebuild.... Oh well, here's a balloon 🥳
Open this Bluesky post in a new tab - Bluesky Post 10h ago
Finally got to importing all (2.284) old Instagram posts to @grain.social, and also embedding it on my Now page: gui.do/now/
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- Bluesky Post 5d ago
I can't take these fights over colors anymore
Open this Bluesky post in a new tab - Bluesky Post 3d ago
Funny story: I had several people warning me that the apple developer program takes forever to get in. Turns out I registered for this back in 2011 (only paid once, totally forgot about it). It was dormant ever since and I could just reactivate it without any hassle 😅
Open this Bluesky post in a new tab - Bluesky Post 3h ago
Did I rate-limit myself (again) doing this? Yes, yes I did
Open this Bluesky post in a new tab - Bluesky Post 5d ago
My board is turning green, what is happening? 🍃
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- Bluesky Post 3d ago
Can we get the post below to at least 487 likes to make it the most liked post about ATmosphereConf? Or should we save that for the actual date/location announcement? 😄
Open this Bluesky post in a new tab - Bluesky Post 3d ago
Whoah I mean I think I've seen most of these datapoints on separate maps/services, but this one throws them all togeher
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- Bluesky Post 1d ago
@atstore.fyi would it be possible to add an optional "builder location" field? That way it can be used to create "locally built atproto apps", which is useful for local atproto community websites, e.g. atproto.nl/tools/ (And also building this for be, no and eu-wide)
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- Bluesky Post 5d ago
Looks like the long awaited @zurichjs.com fomo season has arrived
Open this Bluesky post in a new tab - Bluesky Post 2d ago
I heard you all like voting
Open this Bluesky post in a new tab - GitHub Pushed code 10h agoGitHub
- Tangled Pushed code 10d 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 1mo 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 1mo agoFuturamaTv show · FOX8/10
- Open this Popfeed review in a new tabPopfeed 1mo agoGodzillaFilm · Roland Emmerich8/10
- Open this Popfeed review in a new tabPopfeed 1mo agoSugarTv show · Apple TV9/10
- Open this Popfeed review in a new tabPopfeed 2mo agoFinal SpaceTv show · Adult Swim10/10
- Open this Popfeed review in a new tabPopfeed 2mo agoPantheonTv show · Netflix10/10
- Open this Popfeed review in a new tabPopfeed 2mo agoSexistentialAlbum · Robyn8/10
- Open this Popfeed review in a new tabPopfeed 2mo agoDe vloek van PolyfemosBook · Evert Hartman9/10
- Tangled Pushed code 2mo 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 2mo agoLEAN STARTUP metodikaBook · Eric Ries7/10
- Open this Popfeed review in a new tabPopfeed 2mo agoThe Man from EarthFilm · Richard Schenkman10/10
- Open this Popfeed review in a new tabPopfeed 2mo agoThe Last of UsTv show · HBO9/10
- Open this Popfeed review in a new tabPopfeed 2mo agoBeat SaberVideo game9/10
- Tangled Pushed code 3mo agobsky-avatarDynamic avatar rotationOpen this Tangled code in a new tab
- Smoke Signal Going 3mo agoatproto.local federation formation working sessionMay 21, 2026Open this Smoke Signal event in a new tab
- Tangled Pushed code 5mo agoatproto-plc-counterAT Protocol PLC directory counterOpen this Tangled code in a new tab
- Smoke Signal Going 5mo agoCreating the ATmosphereMar 27, 2026Open this Smoke Signal event in a new tab
- Tangled Pushed code 6mo agosifa-lexiconsAT Protocol lexicon schemas for Sifa professional profiles (id.sifa.*)Open this Tangled code in a new tab
- Tangled Pushed code 6mo 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 6mo agobarazo-deployBarazo Docker Compose templates for self-hostingOpen this Tangled code in a new tab
- Tangled Pushed code 6mo agobarazo-lexiconsBarazo lexicon schemas and TypeScript typesOpen this Tangled code in a new tab
- Tangled Pushed code 6mo agobarazo-webBarazo default frontendOpen this Tangled code in a new tab
- Tangled Pushed code 6mo agobarazo-apiBarazo AppView backendOpen this Tangled code in a new tab
- Smoke Signal Going 7mo agoATmosphereConf 2026Mar 26, 2026Open this Smoke Signal event in a new tab
- Grain Gallery · 13 photos Oct 2024Just like @sander_mangel we went mushroom 🍄 spotting today 😄🌳
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- Grain Gallery · 10 photos Sep 2024Day at the zoo
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- Grain Gallery · 5 photos Sep 2024About last Friday.... #aliceinwonderland @spryker Pictures by @livplotz
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- Grain Photo Sep 2024Another WFH perk: walking/cycling your kids to school 💚 🏡
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- Grain Photo Aug 2024Campsite excitement: Thunderclouds! 🌩️
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- Grain Photo Jul 2024Mandatory monument picture
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- Grain Photo Jul 2024I may have underestimated how well courgette/zucchini germinate... Courgette soup 🥣 in…
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- Grain Gallery · 3 photos May 2024Transportation practice, Dutch version 🚲
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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
189 talks, 27 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
"From the very first moment, he welcomed me with his enthusiasm and passion for e-commerce, community, and the Spryker product."
"From the start I got a lot of responsibilities and freedom, which made it a valuable time learning about growth hacking, UX and conversion optimization."
"What stands out most is his ability to balance strong opinions with genuine psychological safety."
let's make something
Work with me
A handful of engagements each year. Pick the format that fits what you're trying to achieve.
Event speaker
Keynotes and workshops at your conference, company event or developer meetup. 27 countries, 189 talks so far.
Invite me to speakor just send me a note · follow on Sifa ID