Hi, I'm Ondrej. I help fintech companies make AI actually useful.

I'm an engineer. I used to run engineering at a crypto trading firm. Now I help Ohpen build software with AI, and I teach teams to do it themselves.

Email me → LinkedIn
Ondrej Macko

How I help

What I can help with.

It usually starts with one of these and leads to another.

01

AI in engineering

Your team has AI tools. But is it shipping better software, or just more of it? I set up AI coding agents with proper checks, and measure whether they really help.

  • A plan for AI that fits your company
  • Coding agents you can trust
  • Measuring results without spying on people
02

Fintech platforms

I design and build lending, banking and trading systems. The kind where money has to add up to the cent, and you have to be able to explain every decision.

  • Architecture reviews
  • Hands-on building, mostly in Rust
  • Faster, stricter build and release pipelines
03

Education and training

Practical training on AI and good engineering. Built from real work, not slides about the future. For developers, managers and leaders.

  • Talks, workshops, longer programmes
  • Practice on your own code
  • In Slovak, Czech, English or German
04

Engineering leadership

Someone to think things through with, if you're a CTO or lead engineers. How to set up teams, what to measure, how to hire and bring people in well.

  • Running a team when AI writes a lot of the code
  • Fairer hiring
  • Onboarding that works

Recent results

Some numbers from this year.

37% → 68%of AI coding-agent runs that finish the job, after I found and fixed why they kept failing
0% → 57%of code written with AI help, across 26 codebases in six months. Measured without spying on anyone.
1,066business rules dug out of an old lending system, each one backed by evidence
~5 minto build and test a change on a lending platform, down from about 17

All from 2026, counted from real records. No estimates.

Consulting and education

I advise and teach at the same time.

I don't drop off a report and leave. I work with your people on your real problems, so the know-how stays after I'm gone.

Advise · leaders

AI without the hype

Where AI pays off in your business, what it really costs, and how to tell if it's working.

Build together · engineering teams

Learn on your own code

I work next to your engineers on real tasks until they can do it without me.

Teach · engineers and managers

Workshops and programmes

Working with AI coding agents, leading a team that uses AI, good engineering habits in fintech. A talk, a day, or a few weeks.

Ways to start

  1. Half a dayLeadership briefingWhere AI pays off for you, what it costs, how to measure it.
  2. 1 dayWorkshopHands-on, up to 15 people, ideally on your own code.
  3. 2–3 weeks · fixed priceAI reviewI look at how you really use AI today and what's risky, then give you a clear 90-day plan. Most clients start here.
  4. 1–6 monthsBuild togetherI join your team until they can run it themselves.
  5. MonthlyAdvisoryTwo days a month with your leaders: decisions, reviews, a second opinion.

In person in Slovakia and Czechia. Remote anywhere in Europe.

Background

What I've done.

  1. 2025 – now

    Founder, Nuvoa

    My own company. I consult and teach on AI and fintech.

  2. Building now

    Nuvoa Health

    With my wife, who's a physiotherapist, I'm building software that helps physios plan treatment and helps patients actually do their exercises at home. It starts in her practice.

  3. 2025 – now

    Engineering manager, Ohpen

    I lead AI projects and help design their new lending platform. I got their AI coding agents working reliably, measured how the teams really use AI, and mapped the rules of an old system before it's replaced.

  4. 2022 – 2024

    Engineering manager, Wincent

    I ran engineering at one of the world's top 10 crypto market makers. Systems that trade 24/7, where speed and getting it right both count.

  5. Studies

    MSc in Cloud Computing Engineering

    I studied engineering in Austria: a bachelor's in Vienna, then a master's in cloud computing in Eisenstadt.

  6. 2014 – now

    Teaching kids to build robots

    I coached a youth robotics team for four years, and I've judged at the FIRST LEGO League since 2018. I also supervised students' service projects in the International Baccalaureate. That's where I learned I like teaching as much as building.

How I work

No hype, no guessing.

  • Show the evidenceIf I say something works, I can show you why. If I'm not sure, I say so.
  • Measure firstAI gets more responsibility only when the numbers back it up. Not because a demo looked good.
  • Make myself unnecessaryThe goal is that your team doesn't need me anymore.

Want to talk about AI, a fintech platform or training your team?

Drop me a line. A short call is usually enough to see if I can help. If I can't, I'll tell you.

[email protected] → LinkedIn