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co-Founder / CTO
AI is analyzing your overall score…
Identifying your key strengths…
Evaluating your skill match against the job requirements…
Assessing your cultural and operational fit
The average developer follows big tech practices. Big tech has high downside risk, low upside, and infinite runway. That's the opposite of a startup. I'm a developer / CTO / co-founder who specializes in seed stage SaaS & AI startups. I build fast. I focus on product-market fit and interaction with customers. I make sane choices on security, compliance and architecture that don't require months of implementation time. I'm experienced with client and VC calls. I have good-enough design skills. I work primarily for equity.
Utrecht University
Bachelor's degree, Artificial Intelligence
January 1, 2013 – January 1, 2018
KSG De Breul
VWO, Economie&Maatschappij
January 1, 2006 – January 1, 2012
Twinshape
CTO / co-founder
April 1, 2026 – Present
Amsterdam, North Holland, Netherlands
EnFoldr
CTO / co-founder
March 1, 2025 – Present
Amsterdam, North Holland, Netherlands · Hybrid
Toon Alfrink Consulting
Freelance Software Developer
April 1, 2023 – May 1, 2026
Amsterdam · Remote
Surebird
Technical Founder
May 1, 2022 – March 1, 2023
The Randstad, Netherlands
BNG Bank
Application Specialist
November 1, 2019 – January 1, 2022
Den Haag
Harvest
Consultant
November 1, 2019 – October 1, 2020
Driebergen
EA Hotel
Manager
September 1, 2018 – June 1, 2019
Blackpool, United Kingdom
Road to AI Safety Excellence
Founder
July 1, 2017 – June 1, 2019
Institute of Exponential Sciences
Chief Science Officer (AI)
March 1, 2015 – May 1, 2018
http://iescience.org/
Universiteit Utrecht
Student assistent
September 1, 2014 – July 1, 2015
Utrecht Area, Netherlands
Vrije Universiteit Amsterdam
Programmer
December 1, 2011 – September 1, 2014
Amsterdam Area, Netherlands
COSMIC Foundation Level
Common Software Measurement International Consortium
June 23, 2026 – Present
Economics of Money and Banking
Columbia University
June 23, 2026 – Present
Microsoft Certified: Azure Fundamentals
Microsoft
June 23, 2026 – Present
Advanced Distributed System Design
Particular Software
June 23, 2026 – Present
Professional Scrum Master I (PSM I)
Scrum.org
June 23, 2026 – Present
Cultural Fit Analysis
The candidate's experience as a founder and CTO in multiple startups, coupled with freelance work, suggests a strong entrepreneurial drive and comfort with fast-paced, high-responsibility environments. Their involvement in 'Effective Altruism' and 'AI Safety' initiatives indicates a mission-driven mindset and an interest in ethical and societal impact, which could align well with organizations focused on responsible technology. However, the direct alignment with a dedicated Security Engineer role, which often requires deep specialization in specific security domains (e.g., network security, application security, incident response), is not explicitly detailed in their project diversity. While 'security and privacy hardening' is mentioned, dedicated security projects or roles are not prominent, which might indicate a broader, rather than specialized, security focus.
Soft Skills & Operational Fit
The candidate demonstrates strong leadership, product ownership, and mentoring skills from their CTO and founder roles. Their experience in iterating scrum implementations and coaching founders suggests a proactive and collaborative operational fit. The diverse project experience indicates strong problem-solving and adaptability.