Olexander K.
Private message 
Velikie Mosty,
Ukraine
available for hire
Rating
Language proficiency level
Українська: fluent
Русский: fluent
English: upper-intermediate
CV
Web developer, Python/JS. I build websites, backends, parsers, Telegram bots, API integrations.
Stack: Python (FastAPI, aiogram, BeautifulSoup, Selenium), JavaScript/TypeScript (Node.js, React), PHP (WordPress, OpenCart). Databases: PostgreSQL, MySQL, MongoDB.
Also do AI automation: n8n workflows, ChatGPT/Claude integration into business processes, data processing, AI-powered chatbots.
I deliver on time or earlier. Clean code with README and docs.
Skills and abilities
Programming
Services
Translation
Portfolio
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SafeCheck - Food Safety Compliance SaaS (Next.js)
Javascript and Typescript
Every morning the app generates checklists from templates. Staff logs temperatures, out-of-range readings fire email alerts to managers within seconds. Overdue checklists get reminders at 2pm. Monday digest with compliance percentages. Kitchen staff logs in with 4-digit PIN, owners get Stripe billing and admin panel. Works offline, syncs through IndexedDB queue + service worker.
#nextjs #typescript #supabase #stripe #saas #react
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Multi-Chain Liquidator - DeFi Bot (Rust + Solidity)
Cryptocurrency & Blockchain
Rust bot watching 18K+ borrower positions across 3 blockchains (Mantle, Ink, HyperEVM) and 6 lending protocols. When health factor drops below 1.0, fires a flash loan liquidation through custom Solidity contracts, swaps collateral on DEXes, repays the loan, keeps the profit. Zero capital needed. Multicall3 batch scanning (604 borrowers in 250ms). Live dashboard with monitors, at-risk positions, competitor tracking.
#rust #solidity #defi #blockchain #flashloans #aave
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GGHub - CS2 Tournament Platform (.NET 9 + Telegram)
Cryptocurrency & Blockchain
CS2 duel platform. Two players type /duel in Telegram, pick format, pay entry fee through Cryptomus. The API calls DatHost, spins up a CS2 server, sends IP back via SignalR. Match ends, webhook reports score, winner gets the pot. Forfeit logic checks actual ping from server console logs. 9 projects, 7 controllers, 2 SignalR hubs, full tournament bracket generation.
#dotnet #telegram #signalr #crypto #gamedev #cs2
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CreatorHub - Content Creators Platform (.NET 9)
C#
Marketplace where video editors, designers and scriptwriters find each other and get hired. 9 service categories, reviews, portfolios, follow system, moderation queue. 8 projects in one .NET solution: domain layer has zero DB dependencies, infrastructure implements the contracts, Blazor SSR handles the UI with Fluxor state. 26K lines, FluentValidation on every endpoint, AutoMapper for all DTOs.
#dotnet #blazor #csharp #efcore #cleanarchitecture #marketplace
Reviews and compliments on completed projects 6
6 June
609 USD
Marketplace of accounts + bot + automation
I am very satisfied with the collaboration. Oleksandr was always in touch, took responsibility for the tasks, and suggested interesting ideas for integrating the service.
During the work process, there were moments that were not detailed in the initial scope, so some solutions had to be found along the way. He handled this well — the proposed ideas turned out to be useful and worked well in the project.
We have successfully completed the second scope of work. I would like to highlight that the freelancer also improved minor functionality that was not described in the task at all, which is very pleasant.
Overall, I am very satisfied with the work and can recommend him for collaboration.
Thank you, Oleksandr, Everything was quick and competent.
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24 April
609 USD
Marketplace accounts + bot + automation
The first stage (Stage 1) has been successfully completed. The freelancer works very quickly, proactively, and inventively — offers adequate solutions and promptly closes tasks and fixes. Communication is okay, always in touch, shows progress regularly. Overall, I am satisfied with the pace and approach, we plan to continue working on the next stages.
24 March
163 USD
Refinement of the website for the online gallery
Operational execution and clarifications on all issues. I recommend the performer!
Did it quickly, with quality, I recommend, the best in his field for sure
11/10
12 March
116 USD
A website is needed on Shopify or other builders, it doesn't matter.
Everything is great, everything is excellent, everything works perfectly.
Activity
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Bug fixes in Python automation for uploading videos to YouTube
50 USD
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Freelance project
68 USD
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SEO specialist for promoting an online store
609 USD
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Development of Frontend for Telegram Mini App
486 USD
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LinkedIn parsing
151 USD
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React + TypeScript Layout Designer: creating UI components from Figma for a desktop application
566 USD
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A developer is required to create an HTML5 playable creative in the format of a roulette (spin wheel).
166 USD
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Layout of a simple page
48 USD
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A web developer is needed to finalize the website and launch it on hosting.
48 USD
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Website parsing by schedule mouser
233 USD
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