Join Me in Building the
Future of AI Reasoning
ReasonKit is growing faster than I can build alone. I'm looking for a technical co-founder who's excited about structured thinking, cognitive engineering, and making AI more reliable.
Who I Am
Len P. van der Hof, MSc
27 years old, based in Rotterdam, Netherlands. I hold a Master's degree in Strategic Entrepreneurship and have been deep in the AI reasoning space for the past year. I built ReasonKit because I was frustrated with how LLMs give confident but shallow answers. The research showed a better way (Tree-of-Thoughts: 74% vs 4% success), and I'm making it accessible to every developer.
What I Bring / What I'm Looking For
What I Bring
- Product vision & strategy
- Business development & sales
- Research translation (academic > practical)
- Early traction (12K+ installs, enterprise interest)
- MSc in Strategic Entrepreneurship
- Full commitment to this mission
What I'm Looking For
- Strong Rust and/or Python skills
- Experience with AI/ML systems
- Ability to ship production code fast
- Product sense (not just engineering)
- Passion for structured reasoning
- Ready to go all-in on this
The Opportunity
Significant Equity
True co-founder equity split. We build this together.
Ground Floor
Shape the product, culture, and company from day one.
Cutting-Edge Work
Work on problems at the frontier of AI reasoning.
What We're Building
ReasonKit brings Tree-of-Thoughts research to practical AI development.
The Problem
- LLMs give confident but shallow answers
- Chain-of-thought prompting: 4% success on hard tasks
- Developers waste hours on prompt engineering
- Critical decisions get surface-level analysis
The Solution
- 5 specialized reasoning modules (ThinkTools)
- Tree-of-Thoughts: 74% success rate
- Works with Claude, Gemini, OpenAI
- Rust-first for performance (< 100ms)
Interested? Let's Talk
I'm looking for someone who gets excited reading about this. If that's you, reach out.
cofounder@reasonkit.sh- Include in your email:
- 1. Your GitHub/portfolio
- 2. Why you're excited about ReasonKit
- 3. One feature you'd want to build first