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Chernihiv, Ukraine to St. Pölten, Austria

Denys ShcherbatyiAI-Native Fullstack Engineer

I build AI products that survive production.

Fullstack engineer in Python and TypeScript. Most recently I took a commercial AI SaaS from its first commit to production.

Explore workWrite on Telegram(opens in a new tab)

Main stack: Python / FastAPI / TypeScript / Next.js

Selected work

Three projects that show the range: a live multiplayer canvas, a 3D product and an AI experiment.

Two browser windows side by side: a pixel drawn in one appears in the other at once.
1 / 1Real-time sync between two clientsSource

LivePausedLast commit May 2026

Pixel Battle

A shared pixel canvas where people draw together in real time.

My role
Frontend engineer in a team of two
What I built
  • Built the Next.js canvas: wheel zoom, panning, a grid overlay and a colour palette.
  • Pixels arrive over STOMP/SockJS WebSockets, so every change shows up without a reload.
  • Login, registration and token refresh flows against the backend API.
Stack
Next.js / React / TypeScript / Tailwind CSS / STOMP / SockJS / Docker / Nginx

Backend (Java, Spring Boot) by Dmitro Itsko.

Open live site(opens in a new tab)Frontend source(opens in a new tab)Backend source(opens in a new tab)Project page: Pixel Battle
The 3D main building of the campus with a location panel: a photo of the real building and its description.
1 / 4Location panelSource

LiveIn developmentLast commit Sep 2026

Campus Navigate 3D

An interactive 3D map of a university campus with guided tours.

My role
Fullstack developer: frontend and backend
What I built
  • React and Three.js frontend with animated camera routes, bounded free-camera controls and location panels.
  • Optimised for a large 3D model: Draco-compressed glTF and a loading screen with real progress.
  • Django REST API with an admin panel for locations, flight paths and 3D models.
Stack
React / Three.js / Vite / Django / DRF / PostgreSQL / Docker

The 3D model of the campus by Maksym Sydorenko, 3D modeler.

Open live site(opens in a new tab)Frontend source(opens in a new tab)Backend source(opens in a new tab)Project page: Campus Navigate 3D
A generated brick maze with buttons to train or start the neural network.
1 / 2Manual controlSource

CompletedLast commit Jul 2025

Neural Network Labyrinth

A maze game where a neural network learns to navigate procedurally generated levels.

My role
Author
What I built
  • A TensorFlow/Keras network steers the character and learns to find the exit.
  • Procedurally generated mazes with adjustable complexity.
  • Manual play and AI mode side by side, with training on demand.
Stack
Python / TensorFlow / Keras / Pygame / NumPy
Source code(opens in a new tab)Project page: Neural Network Labyrinth
All 8 projects

What I bring

The same four areas as the system map — each backed by work that is in production or in the open.

  • AI systems

    MCP + OAuth 2.0

    Multi-agent LLM pipelines with structured outputs, and fault tolerance for results that are not deterministic. Products exposed to AI assistants through MCP.

    LLM APIs / Vertex AI / MCP / Structured outputs

  • Backend

    FastAPI + async

    Async Python services with background work, real-time progress over SSE and WebSockets, and subscription billing with usage quotas.

    Python / FastAPI / Pydantic / MongoDB / PostgreSQL / Redis

  • Product UI

    Next.js + Three.js

    Next.js and React interfaces on a shared design system, admin consoles, browser extensions, and 3D where it earns its place.

    TypeScript / Next.js / React / Tailwind CSS / Three.js

  • Infra & delivery

    Docker + CI/CD

    Automated CI/CD with secure deployments, safe database migrations and isolated environments, plus one quality gate shared by local runs and CI.

    Docker / GitHub Actions / Google Cloud / Linux

Experience

  1. Sep 2025 – Aug 2026

    AI-Native Fullstack Engineer

    Contract with a US-based company (NDA), Remote

    Commercial AI-powered SaaS platform for content analysis, from first commit to production.

    • Architecture, FastAPI backend and Next.js frontend with a shared design system
    • Multi-agent LLM pipeline and an MCP server with OAuth 2.0
    • CI/CD, subscription billing, real-time progress, admin console and privacy features
    • 1,300+ backend tests, 80+ documentation pages including 20+ ADRs, 1,100+ commits

  2. May 2024 – Sep 2025

    Freelance Fullstack Developer

    Self-employed, Remote

    Browser extensions, 3D web apps and bots — built and shipped end to end.

  3. Feb 2025 – Jul 2025Education

    Erasmus+ exchange semester, Computer Science

    FH St. Pölten, St. Pölten, Austria

  4. Sep 2021 – Jun 2025Education

    Bachelor’s degree in Computer Science

    National University of Chernihiv Polytechnic, Chernihiv, Ukraine

Open to work

Let’s talk

Open to remote fullstack and AI engineering roles. Telegram is the fastest way to reach me. Email and CV work just as well.

Write on Telegram @Zebaro24(opens in a new tab)Download CV (PDF)
zebaro.work@gmail.com
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It lands in my Telegram. I answer where you tell me to.

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