Oleksandr

OLEKSANDR IVANCHUK
[відкрити контакти](див. вище в блоці «контактна інформація») ✦ Telegram

SUMMARY
A results-driven Python Developer with 3+ years of experience crafting robust, automated backend systems and industrial IoT
solutions. Proven track record of owning the full project lifecycle, from concept to deployment via SSH, Linux VPS management,
and CI/CD pipelines (Docker, GitHub Actions). Specializing in scalable web applications and microservices with FastAPI, as well
as hardware integration, PLC/controller automation, and edge computing.

WORK EXPERIENCE

Python Developer / Automation Specialist (Part-time) Oct. 2025 – Present
• Industrial IoT & Hardware: Programmed KSP controllers and Coolmay PLCs (GX Works2) via RS-485 / Modbus RTU for
real-time polling and control of industrial sensors, rotary encoders, and Variable Frequency Drives (VFDs).
• Software & HMI: Developed a PyQt HMI control panel for extruder machinery and sensor calibration workflows.
• Edge Computing & ML: Took over and refactored a legacy project to production-ready state, deploying a custom-trained ML
model to run fully offline on standalone, resource-constrained mini-PCs.
• ERP & Automation: Customized Frappe 16 / ERPNext modules (DocTypes, Workspaces, Roles) and implemented
automated Git workflows for dev instances.

Payex24 Feb. 2023 – Oct. 2025
Python Developer
An innovative online currency exchange platform facilitating efficient and secure transactions.
• Built an autonomous system integrating a Telegram bot and website to process currency exchanges.
• Automated workflow updates for exchange rates using Python, requests, and aiohttp to increase data accuracy and reduce
manual intervention.
• Designed and maintained scalable APIs that ensure seamless integration between the bot and the website, enabling real-
time data processing for enhanced services.
• Configured the system's deployment on Linux servers via SSH and Docker.
• Implemented a CI/CD process via GitHub Actions for automated project deployment, ensuring seamless updates and
reduced downtime during releases.
• Implemented third-party APIs and Webhooks into the core logic of the system for data processing and synchronization to
enhance functionality and user experience.
• Managed the full project lifecycle, from initial idea and logic design to final deployment and ongoing support, resulting in
increased efficiency and team collaboration.
• Optimized database queries and structure for improved speed and efficiency in data retrieval, leading to a better user
experience.

PROJECTS

High-Traffic Bot Refactoring & System Migration
Freelance Software Modernization
• Maintained, updated, and refactored legacy codebases for high-traffic commercial Telegram bots with active user bases.
• Redesigned system architecture from the ground up to modern standards while fully preserving business logic and
operational uptime.
• Executed zero-downtime framework/library migrations and database updates without loss of active client data or user
sessions.

Automated UI Interaction
Freelance tech solutions provider focusing on automated systems
• Developed tools for UI interaction using Selenium and EasyOCR for interactive web tabs.

• Created complex mathematical algorithms to identify and form data combinations, which allowed for automated interface
interaction.
• Implemented an automated calculation system for precise detection and interaction with the necessary elements on a
webpage.
• Optimized system performance and improved file management on the server for more efficient resource utilization.

Web Development & AI Solutions
Freelance project development focusing on web platforms and AI integrations
• Created custom web applications and admin interfaces with media management.
• Implemented drag-and-drop features, site configurations, and PostgreSQL database management.
• Developed commercial web platforms and custom RAG (Retrieval-Augmented Generation) services for automated document
and knowledge-base processing.
• Added functionality for automatic sorting and a user-friendly UI/UX design to the admin panel.
• Implemented media file viewing, editing, and optimized uploading to a cloud service.
• Utilized HTMX technology to enhance dynamic user interface interaction.

SKILLS, TECHNOLOGIES & LANGUAGES
• Languages: Python (Advanced), SQL, JavaScript (Basic), TypeScript (Basic), Structured Text (ST) (Basic)
• Frameworks & Libs: FastAPI, Frappe 16, ERPNext, PyQt, SQLAlchemy, aiogram, requests, aiohttp, Alembic, Beanie, lxml,
loguru, async/await, Selenium, EasyOCR, pytest, poetry, pyserial, pymodbus
• Hardware & IoT: KSP Controllers, Coolmay PLC, GX Works2, RS-485, Modbus RTU, Industrial Sensors, Rotary Encoders,
VFDs, Edge Computing
• DevOps & Tools: Docker, Docker Compose, Git, GitHub Actions, CI/CD, Linux, Nginx, SSH, Bash
• Databases: PostgreSQL, SQLite, MongoDB
• Web Technologies: REST API, Webhooks, HTML, CSS, HTMX
• Languages (Human): Ukrainian; English; Russian