# Denis Ostapenko

> Operations and logistics. AI agents and MCP infrastructure. UN Volunteer. Studying at the University of the People. Vintage motorcycles. Fishing. American football. I read a lot and write a little. Quiet faith.

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

I work on operations and AI workflows. Fifteen years in the field, then international logistics. These days I build tools and write about putting AI to work in real processes.

## Personal

I'm Denis. I like old motorcycles, fishing, and getting lost in a book. Fishing came from my father. With motorcycles, it's the quiet work on the machine that keeps me interested.

UN Volunteer. Student at the University of the People.

## Selected work

- [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. Work in progress · Node.js

## Now: September 2026

I'm working on bounded AI agents: how to give a system a clear job, check its work, and keep track of what changed. I'm also studying at the University of the People.

## 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)
- [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)
- [Blogspot](https://denisostapenko.blogspot.com)