Денис

Denys Melnyk
Edinburgh, Scotland | [open contact info](look above in the "contact info" section) | denysmelnyk.dev | github.com/TheDrakl | [open contact info](look above in the "contact info" section)

PROFESSIONAL SUMMARY
Backend developer with hands-on experience building and shipping production software. Recently launched PosylkaUA — a live marketplace with
escrow payments, a Celery/Redis background-job system and a React frontend — built solo from first commit to deployment. Strong with Python,
Django/DRF, FastAPI, PostgreSQL, Docker and AWS. Currently studying Software Development at Fife College.

CORE COMPETENCIES

Python Django & DRF FastAPI & Flask REST API Design PostgreSQL Celery & Redis Payment Integration

Docker & AWS

WORK EXPERIENCE

PosylkaUA Nov 2025 – Present
Founder & Engineer
Building and running a live parcel-delivery marketplace (posylkaua.com) end to end — product, engineering, deployment and operations
Launching solo: onboarding the first drivers and customers, payments/escrow setup, and organic marketing

Self-employed Apr 2024 – Present
Backend Developer (Freelance)
Built and delivered two full websites for recruitment agency clients, including payment gateway integration
Developed REST APIs with Django, FastAPI and Flask; integrated PostgreSQL databases for client projects
Handled the full lifecycle — scoping, development, deployment and post-launch fixes

Chingu Dec 2024 – Present
Backend Developer (Remote)
Built backend features and REST APIs using Django and DRF in a remote agile team
Implemented JWT-based authentication and contributed to code reviews and debugging

GreenCarLane May – Aug 2025
Python Developer Intern
Built and integrated GraphQL APIs with MongoDB to serve charging-station data; wrote Python scripts to automate data collection from live
datasets

PROJECTS
PosylkaUA Live · posylkaua.com

Production peer-to-peer parcel delivery marketplace (Ukraine ↔ EU), built and deployed solo.
Django 5 + DRF API and a React 18 + TypeScript frontend, running on a VPS with Docker Compose and Nginx
Escrow payment flow on Monobank — card payment held until the recipient enters a 4-digit code at handoff, then released — with a signature-verified
webhook, idempotency and automated refunds
Celery + Redis background jobs (auto-expire/refund unconfirmed orders, webhook backstop poller); JWT auth in HttpOnly cookies; Sentry monitoring,
AWS S3, SendGrid + Twilio; CI tests on every push
Viva FastAPI · AI

Full-stack movie app with AI recommendations: FastAPI + SQLAlchemy (Alembic migrations) backend, JWT auth and PostgreSQL; React +
TypeScript + Tailwind frontend
Async OpenAI (gpt-4o) integration for recommendations and conversational search; containerized with Docker
Crypto Delisting Monitor Async pipeline

Async Python service that watches crypto-exchange delisting announcements and pushes Telegram alerts within seconds — asyncio +
SQLAlchemy/asyncpg, Redis and Alembic migrations
Multi-exchange integration via ccxt; API credentials encrypted at rest (Fernet); Dockerized with Postgres + Redis

EDUCATION
Software Development — Fife College 2024 – Present

SKILLS
Backend: Python, Django, DRF, FastAPI, Flask
Databases: PostgreSQL, MongoDB
Tools & Infra: Docker, Celery, Redis, Nginx, Linux, AWS, Git, CI/CD, Sentry
Frontend: React, TypeScript, TailwindCSS, HTML/CSS
Languages: English (fluent), Ukrainian (native), Spanish (basic)