Oleksandr Kovalchuk
Private message 
Lvov,
Ukraine
available for hire
Rating
Language proficiency level
Українська: fluent
English: advanced
CV
💻 What I Do
• Backend Development – Creating and maintaining backend solutions for e-commerce, trading algorithms, and automation bots using Python, Django, and REST APIs.
• Frontend Development – Building responsive and user-friendly interfaces with React, Tailwind, Bootstrap, and modern JavaScript tooling.
• Chatbot Development – Integrating APIs and automation flows (e.g., Telegram API, Viber Bot API) for interactive and efficient communication tools.
• DevOps & Infrastructure – Deploying and supporting projects on Linux servers, implementing CI/CD pipelines with Git, Docker, and Jenkins to ensure smooth and stable operation.
• Game Development – developing 2D and 3D games in Unity with C#, covering system architecture, gameplay mechanics.
🌊 My Workflow
• Requirement Analysis – Understanding project needs and setting clear goals.
• Architecture & Planning – Designing scalable solutions.
• Development – Writing clean, maintainable code.
• Testing & Optimization – Ensuring stability, performance, and security.
• Deployment & Support – Providing assistance after release.
🧰 Skills & Technologies
• Programming Languages: Python, C#, C, JavaScript
• Frontend: React, Tailwind, Bootstrap, Redux, HTML, CSS.
• Backend: Django, Flask, FastAPI, ASP.NET
• Database: MySQL, PostgreSQL, SQLite
• CI/CD: Git, Docker, Jenkins
• GameDev: Unity (C#)
• ChatBots: Python, Aiogram, Telegram API, Viber Bot API
• Web Scraping: Python, Selenium, Playwright, Beautiful Soup
Why clients choose me
✅ Strong full-stack expertise (frontend + backend + DevOps)
✅ Proven track record in commercial & custom projects
✅ Focus on clean code, stability, and security
🚀 Got a project or idea? Let’s turn it into reality — send me a message, and we’ll make it happen.
Skills and abilities
Programming
-
AI & Machine Learning
from 18 USD for hour
-
Bot Development
from 11 USD for hour
- C & C++
-
C#
from 11 USD for hour
-
Cryptocurrency & Blockchain
from 18 USD for hour
-
Data Parsing
from 11 USD for hour
-
Databases & SQL
from 11 USD for hour
-
Desktop Apps
from 11 USD for hour
-
Embedded Systems & Microcontrollers
from 11 USD for hour
-
Gaming Apps
from 14 USD for hour
-
HTML & CSS
from 9 USD for hour
-
Python
from 11 USD for hour
-
Web Programming
from 11 USD for hour
Services
-
Cybersecurity & Data Protection
from 18 USD for hour
-
Data Processing
from 11 USD for hour
-
Information Gathering
from 9 USD for hour
-
Online Stores & E-commerce
from 226 USD for project
-
Payment Systems Integration
from 45 USD for project
Administration
-
DevOps
from 11 USD for hour
-
Linux & Unix
from 11 USD for hour
- Software & Server Configuration
- System & Network Administration
-
Windows
from 11 USD for hour
Portfolio
-
Worker Performance AI Analyzer (Telegram Bot)
AI & Machine Learning
Telegram bot that uses OpenAI’s LLM API to analyze productivity and mood in real time. The system processes chat messages, detects tone, identifies burnout signs, and scores productivity (0–1) with actionable recommendations. Features include individual and team reports, admin-only access, SQLite storage, and structured AI outputs via function calling. Built with Python, aiogram, asyncio, OpenAI API, and Telegram API.
Result:
A scalable HR and management tool that improves team communication and helps managers make data-driven decisions.
-
EspressoLab E-commerce
Web Programming
Coffee e-commerce Django website. The platform includes a product catalog, shopping cart, checkout, and user accounts with order history. It was integrated Google login, online payments via LiqPay, and delivery services via Nova Poshta and Ukrposhta APIs. The site also features blog posts, customer reviews, and informational pages like Home, About Us, and For Business.
-
45 USD Rozetka parser/scraper
Data Parsing
A simple quick parser program for the marketplace Rozetka. It collects a list of products by category/link. It gathers the name, tags, price, images. There is an option to parse the seller, description, reviews, and more. Data export in JSON/Excel/Google Sheets.
If necessary, it is possible to connect automation for periodic program launches, an additional management interface, or adapt it for other needs.
-
ByBit TokenSplash Parser Telegram Bot
Bot Development
Telegram bot that provides real-time insights into active ByBit TokenSplashes promotions. It can display a comprehensive list of ongoing campaigns along with key details, including the number of participants, promotion period, user count, rewards, and other relevant statistics.
The bot automatically parses ByBit TokenSplashes data every hour and stores it in Google Sheets for further analysis and reporting. Its interface, built using the Telegram API, ensures fast, convenient, and user-friendly access to the latest promotional data for traders and analysts alike.
…
Bot features
- uses REST API to get ByBit TokenSplash data (also has selenium scraping aproach);
- saves fetched data to GoogleSheets manualy or every hour;
- Telegram Bot interface with info display and control panel;
-
Lawyer Landing Page
HTML & CSS
Lawyer Landing Page is a responsive landing page for a private lawyer specializing in tax law and business protection. The design is done in the Classic Corporate style, where the use of serif fonts and a restrained color scheme (graphite, deep blue, gold) creates an atmosphere of reliability and premium quality.
Technical stack
Frontend: HTML5, Tailwind CSS with custom theme configuration (brand colors and font pairs).
… Animations and effects: Smooth scrolling, glass menu effect, and micro-animations for buttons.
Interactivity: Pure JavaScript for modal window management (consultation registration) and form processing.
Implemented blocks and functionality
Fixed Glass-Header: Fixed menu with contact details and a quick action button for instant communication.
Pricing grid: Three interaction options with a clear list of services and an emphasis on the most popular package.
Case studies block: Structured presentation of successful cases using contrasting lines to visually separate the stages of work.
FAQ (Accordion): Implemented using native tags, ensuring code cleanliness and accessibility.
Modal Lead Form: A well-designed form for collecting applications with integrated client-side validation and a prepared structure for marketing scripts.
-
LIFEBOOST Landing (food supplement)
HTML & CSS
LifeBoost is an adaptive one-page landing page for presenting a natural vitamin complex. The project is designed in a Premium Minimalist style, with an emphasis on typography, visual clarity, and brand trust.
Technical stack
Frontend: HTML5, Tailwind CSS (used for fast and flexible styling through utility classes).
… Interactivity: Pure JavaScript for implementing FAQ functionality (accordion) and smooth scrolling.
Implemented blocks and functionality
Sticky Navigation: A menu with a blurred background effect that is always at hand.
Product composition (Ingredients): A detailed block with an emphasis on naturalness (0% synthetics) and gradual disclosure of information about the components.
“For whom” block: Use of thematic images to identify the user with the product (IT, active movement, learning).
Interactive FAQ: Convenient solution for customer objections through animated drop-down lists.
Conversion form: Concise footer form for collecting leads with visual confirmation of confidentiality.
Reviews and compliments on completed projects 10
-
Real expert -
Craft master -
Quick answers -
First-class quality -
Nice communication -
High responsibility -
Great price -
Lightning fast
27 May
158 USD
Development of Telegram Bot (Stage 1)
Everything is great! A professional approach to work! Communication was quick, clear, and effective!
17 May
68 USD
Firmware and working with peripherals (without a screen)
Oleksandr is great, understands what he is taking on and knows what he is doing, performs the assigned task well and even more, as he solves additional tasks that arise during the development process. It is a pleasure to work with him.
Thank you. Everything was done on time, the feedback was quality and quick. It is clear that Oleksandr is an expert in his field. Thank you. The bot works as I hoped.
|
11 April
16 USD
Development of the settings panel - Part 2
Oleksandr approached the task responsibly, completed it with quality and on time. Additional questions that arose during the work were discussed and resolved. He took all wishes into account. I definitely recommend him for collaboration.
5 April
45 USD
Розробка панелі налаштувань
I am satisfied with the work. Oleksandr showed initiative and proposed solutions for some aspects that were not fully thought out at the stage of task setting and design.
28 March
338 USD
Create modular mazes
The result is completely satisfactory. Quality, professionally.
24 February
23 USD
Component selection
Everything is fine. The task was completed as required. I met the deadlines. Thank you.
16 February
16 USD
Collection of information about available e-ink displays
Quickly and efficiently completed the assigned task.
11 February
113 USD
Create a scene in Unity (edit the map, using ready-made assets, without code)
Order completed. Excellent!
5 February
23 USD
Creating a Minecraft server.
Despite my many whims, edits, and unconventional ideas, Oleksandr always approached them with understanding, responded quickly, and performed the work with high quality. All tasks were completed neatly, consistently, and at a high level.
I would like to highlight his responsibility, adequate communication, and willingness to bring the project to an ideal result. I definitely recommend him for collaboration and will reach out again myself.
Activity
| Projects underway 2 | Budget | Added | Deadlines | Proposal | |
|---|---|---|---|---|---|
Development of Telegram Bot (Stage 2)
147 USD
|
|||||
|
Integration and connection of the E-ink screen
56 USD
|
| Latest proposals 10 | Budget | Added | Deadlines | Proposal | |
|---|---|---|---|---|---|
|
Development of Telegram Bot (Stage 2)
147 USD
|
|||||
|
Integration and connection of the E-ink screen
56 USD
|
|||||
|
Freelance project
19 USD
|
|||||
|
Freelance project
45 USD
|
|||||
|
Firmware and working with peripherals (without a screen)
68 USD
|
|||||
|
Development of Telegram Bot (Stage 1)
158 USD
|
|||||
|
Development of the settings panel - Part 2
16 USD
|
|||||
|
Freelance project |
|||||
|
Freelance project |
|||||
|
Freelance project |