Денис

Denys Shcherbatyi
AI-Native Fullstack Engineer | Python · FastAPI · TypeScript · Next.js
St. Pölten, Austria · Remote | [відкрити контакти](див. вище в блоці «контактна інформація»)
Telegram: @Zebaro24 | [відкрити контакти](див. вище в блоці «контактна інформація») | github.com/Zebaro24

SUMMARY
Fullstack engineer with 2+ years of experience in Python and TypeScript. Recently built a commercial AI-powered
SaaS platform end to end: architecture, FastAPI backend, Next.js frontend, Google Cloud infrastructure, CI/CD,
Stripe billing, and a multi-agent LLM pipeline. I work through an agent-driven workflow: custom AI subagents
handle codebase research, test writing and first-pass review, while I own the architecture, specify the
implementation and review every change behind automated quality gates. Also shipped the product as an MCP
server for AI assistants.

TECHNICAL SKILLS
Backend: Python, FastAPI, Pydantic, Django / DRF, REST APIs, asyncio, SSE, WebSockets, Background Tasks
Frontend: TypeScript, JavaScript, Next.js, React, TanStack Query, Tailwind CSS, Three.js, Browser Extensions
Databases: MongoDB (MongoEngine), PostgreSQL, SQLAlchemy, Redis, MySQL, SQLite
AI & LLM: Multi-agent LLM Pipelines, AI Agents, MCP, Vertex AI, Structured Outputs, Prompt Engineering
AI-Native Workflow: Claude, Claude Code (custom subagents, skills, hooks), Gemini, GPT
Cloud & DevOps: Google Cloud (Cloud Run, Tasks, Storage, Secrets), Docker, GitHub Actions CI/CD, Linux
Integrations: Stripe, Sentry, PostHog, Mailgun
Auth & Security: OAuth 2.0, JWT, NextAuth, Argon2
Testing & Quality: pytest, Vitest, Playwright, mypy, Ruff, ESLint, Bandit, SOLID
Tools: Git, GitHub, PyCharm, WebStorm

SOFT SKILLS
Clear communication with both technical and non-technical colleagues — management, project managers,
designers, content creators and marketing. Turning product concepts into architecture, task breakdowns and
shipped features in close collaboration with stakeholders. Ownership of technical decisions and delivery. Fast
learner — picks up new tools and frameworks as projects demand.

WORK EXPERIENCE

AI-Native Fullstack Engineer | Contract · US-based company (NDA)
Sep 2025 – Aug 2026 | Remote
Commercial AI-powered SaaS platform for content analysis — from first commit to production.
• Designed the architecture and built the platform end to end — Python / FastAPI backend and Next.js /
TypeScript frontend with a shared design system
• Built a multi-agent LLM pipeline: specialised agents work in parallel, and their structured outputs are
combined into a single scored report
• Designed fault tolerance for non-deterministic AI output — incomplete results never reach users, and failed
runs recover without repeating costly steps
• Optimised resource usage for heavy processing workloads, keeping the service stable under concurrent jobs
• Delivered an MCP server with secure OAuth 2.0 authorization, letting AI assistants work with the product on
users' behalf
• Built automated CI/CD with secure deployments, safe database migrations and isolated environments
• Implemented subscription billing with usage quotas, real-time progress updates, an admin console and
privacy features (data export, account deletion, data retention)
• Moved development to an AI-native workflow: custom subagents for research, testing, review and
documentation checks, backed by one automated quality gate (linting, typing, security scans, architecture
rules, test coverage) shared by local runs and CI
Scale: 1,300+ backend tests · 80+ documentation pages incl. 20+ ADRs · 1,100+ commits
Stack: Python, FastAPI, MongoDB, LLM APIs, MCP, TypeScript, Next.js, React, Tailwind CSS, Docker, Google Cloud

Freelance Fullstack Developer | Self-employed
May 2024 – Sep 2025
Sync-Mate-Extension — Browser extension for synchronized video watching with friends
• Built a cross-browser extension with a FastAPI WebSocket backend for real-time play, pause and seek sync
across shared sessions
• Set up Vitest tests and automated builds with GitHub Actions
Stack: TypeScript, React, Tailwind CSS, WXT, FastAPI, WebSockets, Vitest
Campus-Navigate-3D — Interactive 3D university campus map with guided tours · Live demo · Backend
• Built a React + Three.js frontend with animated camera routes, bounded free-camera controls and location
info panels, optimised for large 3D models
• Developed a Django REST API with an admin panel for locations, flight paths and 3D models; containerised
with Docker
Stack: React, Three.js, Vite, Django, DRF, PostgreSQL, Docker
University-Moderation — Cross-platform Discord & Telegram bot for a university community
• Built moderation and role management, schedule sync across platforms, event scheduling, music streaming
and a multiplayer mini-game
• Integrated Spotify and OpenWeatherMap APIs, a FastAPI service and a PostgreSQL backend
Stack: Python, discord.py, pyTelegramBotAPI, FastAPI, PostgreSQL, Lavalink
Check-Point-SHOP — Telegram bot for ordering products with dormitory delivery
• Built customer and admin flows: catalog, orders, payment confirmation, live order status and inventory
management with role-based access
Stack: Python, pyTelegramBotAPI, SQLAlchemy, PostgreSQL
Other projects: Neural-Network-Labyrinth — maze game where a neural network learns to navigate
procedurally generated levels (TensorFlow, Keras) · Miner-2D — multiplayer 2D sandbox with procedural worlds
and client-server sync over sockets (Pygame)

EDUCATION
FH St. Pölten (University of Applied Sciences)
Erasmus+ Exchange Semester, Computer Science | Feb 2025 – Jul 2025 | St. Pölten, Austria

National University of Chernihiv Polytechnic (NUChP)
Bachelor’s Degree in Computer Science | Sep 2021 – Jun 2025 | Chernihiv, Ukraine

LANGUAGES
Ukrainian — Native | English — Intermediate (B1)