Денис

Denys Kibalenko
Technical Support Engineer | Python Backend Developer
[open contact info](look above in the "contact info" section)

[open contact info](look above in the "contact info" section)

Prague, Czechia / Remote

SUMMARY
Technical Support Engineer with a strong backend engineering background (Python, FastAPI, Django) and
hands‑on experience debugging APIs, integrations, data workflows, and production systems. Skilled in explaining
complex technical issues in simple terms, supporting users, and resolving incidents with accuracy and empathy.
13 years of international maritime leadership shaped my discipline, communication, and ability to stay calm
under pressure - qualities I bring into every customer interaction.

SKILLS
Ticket Handling • Troubleshooting • Incident Investigation • Root Cause Analysis • Technical Documentation •
Knowledge Base Contributions • API Debugging • User Support • Log Analysis • SLA Awareness • Linux • Postman •
Git • Nginx • Swagger/OpenAPI • HTML/CSS • JSON • Data processing

EXPERIENCE
FREELANCE PYTHON DEVELOPER, Mar 2025 - Mar 2026
Supported clients integrating with a custom CRM API, helping understand endpoints, authentication, data flows.
Built and documented REST APIs using Django REST Framework.
Debugged customer issues related to tracking integrations, rate‑limited endpoints, and data inconsistencies.
Analyzed logs, reproduced issues in staging environments, documented findings, and communicated
resolutions to non-technical users while maintaining structured incident records.
Containerized services with Docker and maintained reproducible environments.

PYTHON DEVELOPER, Dec 2023 - Mar 2025
Built an asynchronous FastAPI backend with JWT auth, role‑based access, and background tasks.
Assisted users during onboarding and integration with the API, helping them resolve configuration and
data‑related issues.
Performed diagnostics of production incidents, including SQL bottlenecks, caching issues, and API
misconfigurations.
Wrote internal documentation and improved error messages to reduce support load.
Deployed applications to AWS and Render, monitored logs, and resolved user‑reported issues.

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.
Led international teams, managed safety‑critical operations, and maintained precise documentation.

PROJECTS
An Online Cinema Platform (Backend) - FastAPI • PostgreSQL • SQLAlchemy • Redis • Celery • Docker • MinIO
Built and documented a modular API, debugged async flows, caching, and user‑specific data issues
A Real-Time Nested Comments SPA (live: spa.meizuno.com): Django Channels • Docker • VPS deployment
Implemented WebSocket‑based live updates, maintained CI/CD and production stability
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)