Денис

Denys Kibalenko
Python Backend Developer
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Prague, Czechia / Remote

SUMMARY
Builds production-ready backend systems tested under real-world load, designing RESTful APIs with Django and
async FastAPI, and optimizing PostgreSQL databases for performance. Strong foundation in OOP, SOLID
principles, concurrency, and async programming. Experienced with Dockerized multi-service environments,
AWS, and Linux. Former maritime chief officer with 13 years of international crew leadership - brings
operational discipline, safety-critical decision-making, and cross-cultural collaboration to software engineering.

SKILLS
PYTHON (CONCURRENCY & PARALLELISM), OOP, SOLID, DJANGO, DJANGO ORM, DJANGO REST, FASTAPI, PYDANTIC,
SQLALCHEMY, ALEMBIC, CELERY, REDIS, POSTGRESQL, WEBSOCKETS, POSTMAN, HTML/CSS, LINUX, AWS, POETRY, DOCKER,
DEBUGGING, LOGGING, PYTEST, GIT, SQL (MODELLING & QUERY OPTIMIZATION), ENGLISH (ADVANCED)

EXPERIENCE
FREELANCE PYTHON DEVELOPER, Mar 2025 - Mar 2026
Technologies: Django, Django REST framework, Django ORM, PostgreSQL, SQL, OOP, GIT, Docker, Swagger.
Responsibilities:
Implemented a scalable RESTful API backend for a CRM platform using Django REST Framework
Built a multi-tenant tracking architecture with strict account isolation & ownership enforcement logic
Integrated with external tracking engine through a custom Python client & built public rate-limited endpoints
Designed relational SQL data models and optimized PostgreSQL queries for performance
Containerized backend services using Docker, enabling reproducible development environments

PYTHON DEVELOPER, Dec 2023 - Mar 2025
Technologies: Django, Django REST, Django ORM, FastAPI, SQLAlchemy, PostgreSQL, SQL, OOP, Git, Nginx, Locust
Responsibilities:
Built an asynchronous FastAPI backend with a clean layered project structure, robust custom authentication
system with JWT, refresh tokens, account activation, & secure password handling, Role-based Access Control
Implemented background task pipeline using Celery for email notifications and account lifecycle events
Designed relational database models & optimized queries using PostgreSQL, Django ORM and SQLAlchemy
Containerized applications with Docker, built CI pipelines & deployed applications on Render & AWS

CHIEF OFFICER - Royal Wagenborg HQ, March 2009 - May 2023
Description:
Senior maritime officer responsible for cargo operations, vessel stability, navigation, and safety management
aboard international cargo vessels.

PROJECTS
An Online Cinema Platform: A fully asynchronous backend built with FastAPI, PostgreSQL, SQLAlchemy 2.0,
Pydantic, Alembic, Redis, Celery, Flower, WebSockets, MinIO, CI/CD, Nginx.
A Real-Time Nested Comments SPA (live: spa.meizuno.com): A production-deployed SPA with live WebSocket
comment threading via Django Channels and Redis pub/sub, and CI/CD pipeline deploying to a live VPS.
EDUCATION
Master’s Degree in Navigation & Innovative Technologies
Kherson State Maritime Academy (2004–2010)

ADDITIONAL EDUCATION
MATE ACADEMY - PYTHON DEVELOPER (2023-2025) Books:
Udemy - Python 3: Deep Dive (Functional) Python Tricks. The book, Dan Bader
Udemy - Python 3: Deep Dive (Iterators, Generators) Functional Programming in Python, David Mertz
Udemy - Python Django - The Practical Guide
Udemy - The Complete SQL Bootcamp
LinkedIn Learning - DevOps Foundations

ACHIEVEMENTS LANGUAGES
18 years of international teamwork Ukrainian - Native
Strong communication and leadership background English - Advanced
Typing speed ~60 WPM
Sports achievements (football, athletics)