Overview
Willem Groef is a co-founder and the CTO of e-invoice, a role he has held since January 2025, and is based in Brussels. In January 2026 he also became a co-founder of SevenYoken. Since January 2017 he has worked as a fractional CTO at wdg.sh.
Between May 2022 and April 2024 he was a co-founder and CTO of Airobi. He co-founded Elimity in January 2017 and remained a co-founder until April 2022, serving as its CEO from October 2018 to February 2022.
Groef studied at KU Leuven, where he completed a Master of Science in Computer Science with the Secure Software option between 2009 and 2011, followed by a Doctor of Philosophy in Computer Science from 2011 to 2016.
Career history
In the news
- The Peppol directory is having a hard time #France #Peppol
- So much is cooking in Peppol land
- 𝐍𝐨𝐛𝐨𝐝𝐲 𝐰𝐚𝐧𝐭𝐬 𝐭𝐨 𝐡𝐞𝐚𝐫 𝐭𝐡𝐢𝐬, 𝐛𝐮𝐭 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐟𝐚𝐬𝐭 𝐢𝐬 𝐭𝐡𝐞 𝐫𝐞𝐚𝐬𝐨𝐧 𝐲𝐨𝐮𝐫 𝐒𝐚𝐚𝐒 𝐢𝐬 𝐠𝐨𝐢𝐧𝐠 𝐭𝐨 𝐝𝐢𝐞. Because if the whole product can be cloned in 48 hours, then the product was never the hard part. The building wasn't the moat. Roughly half of new code is already written by AI. Shipping fast used to actually mean something. Now it's just the price of entry. The second everyone can do a thing, that thing stops setting you apart. That's how it goes. So all those late nights grinding
- 𝐒𝐦𝐚𝐥𝐥 𝐭𝐞𝐚𝐦. 𝐓𝐞𝐧 𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐩𝐚𝐜𝐤𝐚𝐠𝐞𝐬. That was the count at an accounting firm Tom Van Asbroeck and I spoke earlier this week. The partner had a word for it: a "lappendeken." A patchwork quilt. He wasn't proud of it, he was tired of it. Pre-accounting here, ledger there, dashboards in a third thing, then a CRM, practice management, tax software, some portal the clients half-use. Each with a subscription. Each with a login someone forgot. And the question the whole sector keeps circling: are AI agents
- While Fable 5 is still available for us poor EU / Belgian / Flemish startups, spend your tokens wisely! #ai #eu
- The more we approach AGI the more we see human behaviour popping up
- Something the American mind can’t comprehend: spending your Saturday at an e-invoicing hackathon Thanks Collibra Stripe Lovable Cursor Cedric Sounard SevenYoken Stijn (Stan) Christiaens Tibo Wiels BOND (YC X25) #peppol #hackathon
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