"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
- GitHub Pushed code 6h agoGitHub
- Open this Popfeed review in a new tabPopfeed 13d agoSiloTv show · Apple TV10/10
- Smoke Signal Going 13d agoAtmosphereConf 2027Apr 29, 2027Open this Smoke Signal event in a new tab
- Tangled Pushed code 14d agoReads lag behind the web UI right after a writeOpen this Tangled code in a new tab
- Tangled Pushed code 14d agoLook up issues/PRs by their #number, not just record-keyOpen this Tangled code in a new tab
- Tangled Pushed code 15d agotest(ci): probe pull_request trigger (do not merge)Open this Tangled code in a new tab
- Smoke Signal Going 19d agoOff Protocol LIVE — with Atmosphere Conf '27 organizersSep 23, 2026Open this Smoke Signal event 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 2mo agoFuturamaTv show · FOX8/10
- Open this Popfeed review in a new tabPopfeed 2mo agoGodzillaFilm · Roland Emmerich8/10
- Open this Popfeed review in a new tabPopfeed 2mo 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 3mo agoSexistentialAlbum · Robyn8/10
- Open this Popfeed review in a new tabPopfeed 3mo agoDe vloek van PolyfemosBook · Evert Hartman9/10
- Tangled Pushed code 3mo 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 3mo agoLEAN STARTUP metodikaBook · Eric Ries7/10
- Open this Popfeed review in a new tabPopfeed 3mo agoThe Man from EarthFilm · Richard Schenkman10/10
- Open this Popfeed review in a new tabPopfeed 3mo agoThe Last of UsTv show · HBO9/10
- Tangled Pushed code 3mo agobsky-avatarDynamic avatar rotationOpen this Tangled code in a new tab
- Smoke Signal Going 4mo agoatproto.local federation formation working sessionMay 21, 2026Open this Smoke Signal event 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 6mo agosifa-lexiconsAT Protocol lexicon schemas for Sifa professional profiles (id.sifa.*)Open this Tangled code in a new tab
- Tangled Pushed code 7mo 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 7mo agobarazo-deployBarazo Docker Compose templates for self-hostingOpen this Tangled code in a new tab
- Tangled Pushed code 7mo agobarazo-lexiconsBarazo lexicon schemas and TypeScript typesOpen this Tangled code in a new tab
- Smoke Signal Going 7mo 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
"What stands out most is his ability to balance strong opinions with genuine psychological safety."
"He delivered results that mattered: developer feedback shaped our product roadmap, engineering teams connected directly with external developers, and our community became stronger after each challenge."
"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."
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. 28 countries, 207 talks so far.
Invite me to speakor just send me a note · follow on Sifa ID