Денис

Denys Shcherbatyi
Python Backend Engineer | FastAPI · PostgreSQL · Docker
St. Pölten, Austria · Remote (CET) | [open contact info](look above in the "contact info" section)
Telegram: @Zebaro24 | [open contact info](look above in the "contact info" section) | github.com/Zebaro24 | zebaro.dev

SUMMARY
Python backend engineer (FastAPI) with 2+ years of experience. Over the last year I built and launched a
production AI SaaS from the first commit: REST API, background processing, Stripe subscriptions, CI/CD with
safe migrations and cloud deployment. I use AI dev tools such as Claude Code every day and know how to get
the most out of them.

TECHNICAL SKILLS
Backend: Python, FastAPI, Pydantic, asyncio, Django / DRF, REST APIs, WebSockets, background jobs
Databases: PostgreSQL, SQLAlchemy, MongoDB
DevOps & Quality: Docker, GitHub Actions CI/CD, Google Cloud, Linux, pytest, mypy, Ruff
AI & LLM: LLM APIs, multi-agent pipelines, structured outputs, MCP, Claude Code
Frontend: TypeScript, Next.js, React

WORK EXPERIENCE

Fullstack Engineer (Python / TypeScript) | Contract · US-based company (NDA)
Sep 2025 – Aug 2026 | Remote
Commercial AI-powered SaaS platform for content analysis, from the first commit to production.
• Designed the architecture and built the FastAPI backend, plus the Next.js / TypeScript frontend
• Designed fault tolerance for non-deterministic AI output: incomplete results never reach users, and failed runs
recover without repeating costly steps
• Optimized resource usage for heavy processing workloads, keeping the service stable under concurrent jobs
• Built automated CI/CD with secure deployments, safe database migrations and isolated environments
• Implemented subscription billing with usage quotas, real-time progress, admin console and data export
• Integrated LLM processing as a parallel multi-agent pipeline with validated structured outputs
• Built AI-native dev tooling: Claude Code subagents, skills and hooks behind one shared quality gate
Scale: 1,300+ backend tests · 80+ documentation pages incl. 20+ ADRs · 1,100+ commits

Freelance Fullstack Developer | Self-employed
May 2024 – Sep 2025
Check-Point-SHOP — Telegram bot for ordering products with delivery
• Built customer and admin flows: catalog, orders, payment confirmation, order status, inventory, roles
Stack: Python, pyTelegramBotAPI, SQLAlchemy, PostgreSQL
Campus-Navigate-3D — Interactive 3D campus map built for a university · Live demo · Backend
• Django REST API and admin panel for locations, camera routes and 3D models; React + Three.js frontend
Stack: React, Three.js, Django, DRF, PostgreSQL, Docker

PROJECTS
Zebaro Core — personal platform on my own server: Telegram bot, FastAPI services, MCP server and site
2025 – present
• Job search: Playwright scrapers for 9 job boards (1,700+ vacancies in 2 months) with tiered filtering
• FastAPI service: Jobs API with keyset pagination, webhooks for GitHub, Telegram and Monobank
• Server tooling from Telegram: Docker control, WireGuard VPN management, scheduled jobs
• Deployed MCP server (Streamable HTTP, bearer auth) used daily with AI assistants to track applications
Stack: Python, FastAPI, Playwright, MongoDB, SQLAlchemy, Docker Compose, GitHub Actions, pytest (650+ tests)

EDUCATION & LANGUAGES
FH St. Pölten, Austria | Erasmus+ exchange semester, Computer Science | Feb 2025 – Jul 2025
Chernihiv Polytechnic National University | BSc in Computer Engineering (AI Systems) | 2021 – 2025
Ukrainian — Native | English — B2 (daily written work, spoken daily in Austria)