# Denis Ostapenko

> I organize people, responsibilities, and processes. My background is in commercial cleaning, industrial production, and logistics, with AI as a tool for practical automation. At NF ELIT, I am Head of AI & Automation and Head of Logistics. I read widely, look after old motorcycles, go fishing, train at the gym, and follow American football and the NFL. I am also a UN Volunteer and a student at the University of the People.

This is a summary of Denis Ostapenko's public profile. It reflects the same content presented on the site's English and Brazilian Portuguese pages.

## Professional

My background is in commercial cleaning, industrial production, and logistics. I work out how a process runs, agree on responsibilities with the people involved, and make the work easier to follow. AI is one of the tools I use for that.

I prefer a calm, direct conversation. If something is unclear, I ask, listen, and work through it with the people involved. I want us to leave with an agreement we can act on: who will do what, what needs checking, and when we come back to it.

## Personal

I like old motorcycles and the quiet work of looking after them. I go fishing, train at the gym, and follow American football and the NFL. I read widely: art history, anthropology, consciousness, the history of civilizations, and whatever question has caught my attention.

I value straightforward conversations and being clear with people. I like listening, understanding another point of view, and having room to think before answering.

I am a UN Volunteer. Separately, I write for HowUSA, a public information project connected to the Ostapenko Foundation. I also study at the University of the People.

## Books and companions

- [Books by Denis Ostapenko](https://denisostapenko.com/books)
- [The Word Machine](https://denisostapenko.com/books/the-word-machine): A book about language models and putting them to work. Free English PDF and EPUB. Also published in English paperback and Kindle editions. ORCID: https://orcid.org/0009-0006-2630-7280.
- [Download PDF](https://denisostapenko.com/books/the-word-machine/the-word-machine-en-US.pdf)
- [Download EPUB](https://denisostapenko.com/books/the-word-machine/the-word-machine-en-US.epub)
- [The Word Machine: English paperback](https://www.amazon.com/dp/B0HK527LKR): ISBN 9798173827562.
- [The Word Machine: Kindle (English)](https://www.amazon.com/dp/B0HMJB148F)
- [AI Personas: Character, Memory, and Development](https://denisostapenko.com/books/ai-personas): An English monograph on character, memory and development in AI personas. Free PDF and EPUB.
- [AI Personas: companion](https://denisostapenko.com/books/ai-personas/companion): Persona, Home Repair Advisor, Mara; local applications with source code and a teaching laboratory.
- [Your App Has to Work](https://denisostapenko.com/books/your-app-has-to-work): A published English book about the work from a prototype to a usable application. 28 chapters; paperback and Kindle editions.
- [Your App Has to Work: English paperback](https://www.amazon.com/dp/B0HMJ6C3MS): ISBN 9798161181843.
- [Your App Has to Work: Kindle (English)](https://www.amazon.com/dp/B0HMJCFPZ6)
- [AI Academy](https://denis-ostapenko.github.io/ai-academy/): Companion courses for The Word Machine in English and Brazilian Portuguese.
- [Your App Has to Work: companion guide](https://guide.denisostapenko.com/guide/): Free English guide with stages, roles, and supporting materials. It accompanies the book; it is not the full book text.

## Work and related projects

- [Denis AI Services](https://services.denisostapenko.com/): A separate site for Denis's services work in applications, business systems, and automation.
- [NF ELIT](https://nfelitwood.com/team): Denis is Head of AI & Automation and Head of Logistics. The company has its own identity and channels.
- [HowUSA](https://howusa.org/ru/about): Public information project with writing by Denis in Russian, Ukrainian, and Belarusian.

## Open projects

- [English ↔ Português](https://denis-ostapenko.github.io/english-portuguese-learning-app/): The language app I wanted for myself. American English and Brazilian Portuguese, with audio, visual vocabulary, and practice in both directions. 2,774 learning items · Free to use
- [AI Academy](https://denis-ostapenko.github.io/ai-academy/): A course on how language models and the systems around them work. From the basic mechanism to RAG, infrastructure, and implementation. 5 courses · 103 lessons · 172 primary sources
- [Agent Run Checkpoints](https://github.com/denis-ostapenko/agent-run-checkpoints): A public companion to my notes on bounded AI agents: task contracts and checkpoints for keeping agent work traceable. Open-source templates · Node.js
- [Modern Python](https://denis-ostapenko.github.io/modern-python-course/): A practical Python course with exercises, checkpoints, and a capstone project. Optional AI labs sit alongside the programming work. 17 milestones · Exercises and a capstone
- [Truck Driver English](https://truck-driver-english-eug.pages.dev/): English practice for truck drivers, built around the situations they face on the road: loading, inspections, dispatch, and roadside conversations. 40 situations · Offline practice

## Now: October 2026

I work in AI, automation, and logistics at NF ELIT and study at the University of the People. My books, learning projects, and notes reflect what I'm working through and learning.

## Pages

- [Professional](https://denisostapenko.com/)
- [Personal](https://denisostapenko.com/personal)
- [About me: Professional](https://denisostapenko.com/about)
- [About me: Personal](https://denisostapenko.com/personal/about)
- [Projects](https://denisostapenko.com/vibe-coded)
- [Books](https://denisostapenko.com/books)
- [All materials](https://denisostapenko.com/blog/all)
- [All professional notes](https://denisostapenko.com/blog)
- [All personal notes](https://denisostapenko.com/blog/personal)
- [Photos](https://denisostapenko.com/photos)
- [Email me](mailto:denis.alex.ostapenko@gmail.com)

## Public profiles

- [LinkedIn](https://www.linkedin.com/in/denisostapenko1985)
- [GitHub](https://github.com/denis-ostapenko)
- [X](https://x.com/daostapenko)
- [Bluesky](https://bsky.app/profile/denisostapenko.bsky.social)
- [Threads](https://www.threads.net/@denis.ostapenko.1985)
- [Medium](https://medium.com/@denisalexostapenko)
- [ORCID](https://orcid.org/0009-0006-2630-7280)
- [Instagram](https://instagram.com/denis.ostapenko.1985)
- [Facebook](https://facebook.com/denis.ostapenko.1985)
- [YouTube](https://youtube.com/@denis.ostapenko.1985)
- [Reddit · u/Rakamy](https://reddit.com/user/Rakamy)
- [Blogspot](https://denisostapenko.blogspot.com)