Marek Pizner
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I help companies put AI and custom software to work — from a small tool that kills a manual routine, to production ML systems running on a factory floor. 9+ years of building the unglamorous parts that actually have to work.
// What I Can Help With
Most people find me somewhere between “we have an idea but no one to build it” and “this is broken and we’re out of ideas”. Both are fine starting points.
Strategy: working out what's actually worth building
The hardest part usually isn't the code — it's naming the real problem. We map how the work flows through your business today, find where time and money leak out, and decide what technology (if any) is worth pointing at it. You get a plan you could hand to anyone, not just me.
- Sessions to map your current process end to end
- Where AI genuinely helps — and where it's hype
- A prioritised roadmap: quick wins first, big bets later
- Build vs. buy, and which tools are worth paying for
- Honest cost, effort and payback estimates
- A written plan you own, with or without me
AI in your business
You know AI could help somewhere, but not where to start. I find the one workflow worth automating first, then build it.
- Assistants that answer from your own documents
- Agents that handle repetitive back-office work
- Email, invoice & report processing
- Honest advice on what AI won't fix
Custom tools & automation
That spreadsheet everyone is scared to touch, the report someone rebuilds by hand every Monday — those become software.
- Internal dashboards & admin tools
- Scripts that replace manual routine
- Integrations between systems that don't talk
- Small web apps, built and handed over
Data & ML engineering
The heavier end: pipelines that don't break at 3am and models that survive contact with production.
- Data pipelines & warehouse setup
- Forecasting and predictive models
- Computer vision on camera / video streams
- Deployment on Docker & Kubernetes
Consulting & second opinions
Sometimes you don't need a build — you need someone who has shipped this before to tell you if the plan holds.
- Architecture & code reviews
- Technical due diligence
- Getting a stalled project moving
- Team mentoring on data & ML
// How Working Together Looks
A free 30-minute call
Tell me the problem in plain language. No prep, no slides. If I'm not the right person, I'll say so and point you elsewhere.
Fixed scope and price
Within a few days you get a short written proposal: what gets built, what it costs, when it lands. No open-ended hourly billing.
Built, delivered, yours
Working software with the source, documentation, and a handover session. You own it — no lock-in to me or anyone else.
// Technical Arsenal
// About Me
Currently a Senior Data Scientist at U.S. Steel Košice, building computer vision systems for industrial granulometry — UNet segmentation models analyzing real-time conveyor belt video streams, deployed end-to-end on Kubernetes.
Previously 6 years as a Senior Data Scientist at Zoniq, designing automated pipelines processing millions of records, building ML models end-to-end, and delivering client dashboards used for real business decisions.
Master’s in Intelligent Software Systems from STU Bratislava. Outside work: weightlifting, running, books, and building finance tools that make data accessible to everyone.
I take on a small number of freelance projects alongside that — which means I’m selective, but the ones I take get proper attention.
// Things I’ve Built
All of these are live and shipped by me end to end — design, code, deployment. Click any of them to try it.
Saturn Lab
Self-hosted ML pipeline management — visual canvas, experiment tracking, and notebook orchestration for data teams.
PollenPal
Real-time pollen forecasts and personalized allergy alerts to help users survive pollen season.
SpotPilot
Live electricity spot price tracker for central European markets — hourly charts, price alerts, and consumption cost estimator.
MealBox
Box-tracking platform for canteens and catering companies — QR scan in/out, live dashboard, overdue alerts, and multi-location management.
FIRE Calculator
Financial independence forecasting based on income, savings rate, and target expenses.
Rent or Sell
Financial decision engine comparing property rent vs. sell returns and opportunity costs.
Portfolio Advisor
Asset allocation analyzer using Modern Portfolio Theory and risk-return optimization.
Black-Scholes
Interactive option pricing via Black-Scholes formula with live parameter visualization.
Netflix Calculator
Determines subscription value by actual viewing time and entertainment cost per hour.
LexiBoost
Fun language-learning tool for English and Italian with spaced repetition.
Chat Control Check
Register of chat and email services showing which ones the EU can legally scan under Chat Control — searchable, in four languages.
Pigeon Empire
Idle clicker game — recruit a flock, feed the pigeons, and build your empire one poop at a time.
Got something that needs building?
Book a free 30-minute call and describe the problem in your own words. You’ll leave with a straight answer on whether it’s worth doing, roughly what it takes, and whether I’m the right person for it. No pitch deck, no obligation.
Remote worldwide · English & Slovak · Usually reply within a day