Олександр

Oleksandr Kalnyi
PYTHON DEVELOPER
[відкрити контакти](див. вище в блоці «контактна інформація») Lutsk, Ukraine, remote Linkedin Telegram GitHub

[відкрити контакти](див. вище в блоці «контактна інформація»)

SUMMARY
Backend Python Developer with practical experience in building RESTful APIs using Django, Django REST
Framework, and FastAPI. Implemented CRUD functionality, user authentication, role-based permissions. Worked
with SQLite for development, PostgreSQL as the primary database and Redis for caching and session management.
Familiar with API testing, debugging and code refactoring. Developed a number of pet-projects, including backend
systems for managing data and users. Able to work under deadlines, collaborate with teammates, and
continuously improve technical skills. Regularly work with technical documentation and conduct independent
research to evaluate and apply appropriate solutions.

EXPERIENCE

Python Developer, Technologies 08/2025 – Present
Technologies: Python, Django, Html/ Css, JavaScript, PostgreSQL
•Developed RESTful APIs for a project News Portal to manage newspapers and topics
using Django Rest Framework
•Implemented CRUD operations, business logic, and data validation for management
system
•Designed and optimized database models and queries
•Built and integrated RESTful APIs for frontend and third-party services
•Worked with Django ORM, migrations, and admin panel customization
•Implemented authentication and authorization mechanisms.
•Fixed bugs, improved code quality, and refactored existing modules
•Wrote and integration tests
•Participated in code reviews and followed coding standards
•Used Git for version control and team collaboration

Private Entrepreneur in the field of retail sales 05/2000 – Present
•Founded and managed a retail business, overseeing daily operations
•Managed sales processes, pricing, promotions, and customer relationships
•Conducted financial planning, budgeting, and cost control
•Worked with suppliers, negotiated contracts, and managed inventory
•Organized logistics and supply chain processes
•Maintained financial records, reporting, and tax documentation
•Ensured compliance with local regulations and business standards.

EDUCATION
Master of Philology with a Specialization in Germanic Languages and Literature, 1992 – 1997
Volyn State University
SKILLS
Object-Oriented Programming (OOP) SOLID principles, Design patterns
Python
Web Development Frameworks Python 3.10+, Advanced Python (Decorators, Iterators,
Django, Django ORM, Django Rest Framework, Generators), Asynchronous Python (asyncio,
FastAPI, Flask Concurrency, Parallelism)

Web Technologies Databases
HTML, CSS,, JavaScript (Basics) PostgreSQL, SQLite, Redis
Knowledge of SDLC, Waterfall, Agile concepts Version Control & Collaboration
(Scrum, Kanaban) Git/ Github
English Development Tools
Intermediate Debugging, Docker

Portfolio:

News Portal, Django web application for managing newspapers, editors and topics

•GitHub Code

Fitness-Club-Membership, DRF web application for managing Fitness Club
•GitHub Code

Cinema api, FastAPI web application for managing Cinema
•GitHub Code

ADDITIONAL EDUCATION

Python course at Mate academy
(OOP, Python, Django)

ACHIEVEMENTS

Built and scaled up a successful small business. Increased the sales
up to 15%. Implemented a new accounting system.