Oleksii

Oleksii Parkhomchuk
Software engineer
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)

Professional Skills:
Python, Django, DRF, FastAPI, REST, Grafana, Celery, PostgreSQL, Clickhouse, Redis, ElasticSearch, Docker Compose, Kubernetes, Github Actions, Nginx, pytest, Sentry.
Summary:
I am a Python Backend Engineer with 4 years of professional experience designing, developing, and maintaining robust software solutions across multiple business domains, including E-commerce, Dating, and Real Estate. I have a strong foundation in object-oriented programming, clean architecture, and database management, with a proven track record of building high-performance web applications, multi-site architectures, and secure third-party integrations.

Throughout my career, I have successfully delivered complex projects by leveraging frameworks like Django and DRF, optimizing heavy queries, and implementing background task workflows. I am highly proficient in containerization and modern deployment practices, ensuring smooth production releases. Combining strong analytical problem-solving with a collaborative teamwork mindset, I am passionate about engineering clean, scalable code and continuously adopting new technologies to solve business challenges.
Work experience:
Backend Python Developer (exist.ua/ 2407.pl/ exist.ae | February 2025 - now)
Description: Maintained and expanded a high-traffic e-commerce infrastructure for a major automotive parts marketplace, developing a unified backend that powers multiple platforms and websites simultaneously.
Responsibilities: Engineered a multi-site (multi-tenant) architecture, allowing a single Django backend to efficiently serve several different e-commerce storefronts and brands. Developed a scalable multi-platform API using Django REST Framework to seamlessly power both web frontends and mobile applications from a shared codebase. Enhanced internationalization (i18n) and multi-language routing to deliver localized content across different domains based on user region. Integrated a wide range of external logistics and delivery APIs (including Nova Poshta, InPost, Uklon Delivery, DHL, and FedEx) to automate multi-region shipping calculations. Implemented secure integrations with global and local payment gateways (such as Monobank, LiqPay, Portmone, Privat24, and PayPal), ensuring reliable checkout and transactional workflows. Was responsible for managing production releases, deploying updates, and ensuring the overall stability of the live platforms.
Tech: Python, Django, DRF, Celery, Redis, PostgreSQL, ElastickSearch, ClickHouse, Kubernetes, i18n, Multi-site Architecture, Logistics APIs (Nova Poshta, InPost, DHL), Payment Gateways (Mono, LiqPay, PayPal), Grafana, Prometeus, Sentry.
Backend Python Developer (THE Capital | March 2024 - December 2024)
Description: Participated in the development and maintenance of an internal Real Estate CRM system focused on automated lead acquisition and third-party service integrations.
Responsibilities: : Implemented custom Webhooks to instantly capture and process incoming customer leads from Facebook, Instagram, and external marketing landing pages. Integrated the platform with IP-telephony APIs (Binotel/Ringostat) to automatically log customer calls, generate client cards, and store interaction history. Developed a corporate Telegram Bot that triggered real-time alerts for agents whenever new customer requests or critical system updates occurred. Managed and structured application data within PostgreSQL, ensuring high performance for search queries and fast retrieval of customer interaction logs.
Tech: Python, Django, DRF, Celery, Redis, PostgreSQL, Webhooks, Telegram Bot API, Telephony API, JavaScript.

Full Stack Web Developer (Heaven Group | June 2022 - March 2024)
Description: Developed an internal ERP/CRM system using Django and Django REST Framework to automate employee management and financial tracking.
Responsibilities: Built a custom Payroll Module that automatically calculated salaries, shifts, and bonuses for all employees, completely replacing manual Excel spreadsheets. Created a background Balance Scraping Service with Celery and Redis to automatically collect financial data and earnings from multiple external websites every hour. Managed corporate accounts and proxy servers in a PostgreSQL database, implementing proxy rotation to prevent IP bans and security blocks from external platforms. Was fully responsible for the deployment process, containerizing the application using Docker and successfully shipping tested code to the production environment.
Tech: Python, Django, DRF, Celery, Redis, PostgreSQL, Sentry,bs4, pytest, Docker Compose, Linux, AngularJS, JavaScript, HTML, CSS, Nginx

Education:
The National Aviation University, Faculty of Biomedical Engineering, Medical Engineering
⦁ 2011 – 2016 (Master’s degree)
Languages:
• Ukrainian (native)
• English (Upper-intermediate)