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Blazej Mrozinski, PhD
Science gives us clarity, but product work gives it purpose.
Psychologist · Psychometrician · Product Leader · Data Scientist
I'm a psychometrician and product designer with a PhD in social cognition who spent twenty years in the lab studying how people think — then started building products that use that science. Think of me as a human translator between science and product — curious by default, never fully satisfied with easy answers.
What I Can Help With
Problems I solve — as an independent consultant or through my companies
Psychometric Assessment & Matching
Career quizzes, competency batteries, personality instruments, cognitive ability tests — designed with IRT and CTT, validated before deployment. Plus the scoring and matching systems that make results actionable. Used by LSEG, EPAM, and HSE Ireland.
See GyftedGrowth Engineering & SEO
Programmatic SEO at scale (1,200+ pages for Prawomat, 1.2M users for Gyfted), AI/LLM optimization for ChatGPT and Google AI Overviews, and product-led growth systems. Zero paid spend — all organic, all compounding.
See Digital SavagesProduct Consulting
From concept to production — scoping, specification, and product direction for assessment platforms, workforce development systems, AI editorial tools, and legal tech. I lead product, engineering teams handle code.
See my workStatistical Modeling & Research
SEM, multilevel modeling, latent class analysis for complex research. Published in JPSP, Self and Identity, Frontiers in Psychology. Teaching stats and research methods at SWPS University since 2006.
See SWPSWhy these worlds belong together
Psychometrics, product consulting, growth engineering, and statistical modeling sit on the same page because they run on the same engine: measurement, systems thinking, and turning fuzzy human problems into testable product logic. The gap between "we think this works" and "we measured that this works" is where most products fail — and where all of this work lives.
15
Peer-Reviewed Papers
4
Ventures Co-Founded
6+
Products Shipped
20+
Years in Academia
Selected clients & partners
LSEG EPAM gr8.tech Relativity HSE Ireland UCL esportsLABgg
Case Studies
How I approach problems — the methodology, the results, and what I learned
"I'm not a developer. I'm a psychologist who builds products. The science disappears into the product — that's the point."
Companies
Things I started, run, or helped build from the ground up
Writing
AI as CTO · infrastructure from scratch · psychometrics in production · growth systems · rigorous experimentation
Why Every Project Gets a Design Spec: A Product Spec Template for AI-Driven Development
Design specs aren't documentation overhead. When your CTO is an AI, the spec is your management layer. Here's why the same pattern works across six projects in wildly different domains.
WordPress Security on VPS: Nginx Rate Limiting, Fail2ban Jails, and SSL Hardening
Two-layer WordPress VPS security: Nginx blocks wp-login brute force and scanner probes before PHP runs, fail2ban bans repeat offenders at the kernel level. Full SSL/TLS and WooCommerce hardening.
Not ready to talk yet? Start here instead.
Let's talk
If any of this maps to a problem you're working on — pick a 30-minute slot. No pitch, no deck. Just a conversation about what you're trying to solve.
Prefer email? Drop a line below — I read everything.