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  1. Freelancers

Olexander K.

Reliable Plus holder
Offer Olexander work on your next project.

Ukraine Velikie Mosty, Ukraine
currently online
responds to 44% of messages
Available for hire available for hire
1 project underway
6 Safes completed
22 days 11 hours back
5 clients
58 proposals made
on the service 3 months 17 days
  • jquery
  • web developer
  • flexbox
  • C#.NET Developer
  • telegram python bot
  • telegram bot
  • AI
Freelancer Olexander K. — Ukraine, Velikie Mosty. Core skill — Web Programming, Python

Rating

Successful projects
100%
Average rating
10 out of 10
Rating
4733
Web Programming
119 place out of 6561
Python
102 place out of 4531
2 projects
AI & Machine Learning
2 projects
Javascript and Typescript
2 projects
Web Programming
1 project
Databases & SQL

Language proficiency level

Українська Українська: fluent
Русский Русский: fluent
English 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


  • SafeCheck - Food Safety Compliance SaaS (Next.js)

    Javascript and Typescript
    SafeCheck - Food Safety Compliance SaaS (Next.js) — example of freelancer's portfolio work in category 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

  • Multi-Chain Liquidator - DeFi Bot (Rust + Solidity)

    Cryptocurrency & Blockchain
    Multi-Chain Liquidator - DeFi Bot (Rust + Solidity) — example of freelancer's portfolio work in category 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

  • GGHub - CS2 Tournament Platform (.NET 9 + Telegram)

    Cryptocurrency & Blockchain
    GGHub - CS2 Tournament Platform (.NET 9 + Telegram) — example of freelancer's portfolio work in category 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

  • CreatorHub - Content Creators Platform (.NET 9)

    C#
    CreatorHub - Content Creators Platform (.NET 9) — example of freelancer's portfolio work in category 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

  • Real expert
  • Craft master
  • Quick answers
  • First-class quality
  • Nice communication
  • High responsibility
  • Great price
  • Lightning fast

6 June 601 USD
Marketplace of accounts + bot + automation

Quality
Professionalism
Cost
Contactability
Deadlines

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.

Dmitro Borsuk | Personal | Response review

6 May 312 USD
Integration of CRM (Roapp) with Google Ads via GCLID (offline conversions)

Quality
Professionalism
Cost
Contactability
Deadlines

Thank you, Oleksandr, Everything was quick and competent.

Mykola Shevchenko | Safe Safe | Response review

24 April 601 USD
Marketplace accounts + bot + automation

Quality
Professionalism
Cost
Contactability
Deadlines

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.

Dmitro Borsuk | Safe Safe | Response review

24 March 159 USD
Refinement of the website for the online gallery

Quality
Professionalism
Cost
Contactability
Deadlines

Operational execution and clarifications on all issues. I recommend the performer!

Aleksandr M. | Safe Safe | Response review

19 March 145 USD
Developer of Chrome Extension / JS script for automating YouTube Studio (WITHOUT API)

Quality
Professionalism
Cost
Contactability
Deadlines

Did it quickly, with quality, I recommend, the best in his field for sure

11/10

Konstanitn Abunov | Safe Safe | Response review

12 March 113 USD
A website is needed on Shopify or other builders, it doesn't matter.

Quality
Professionalism
Cost
Contactability
Deadlines

Everything is great, everything is excellent, everything works perfectly.

Oleksandra Svynarenko | Safe Safe | Response review

Activity

  Projects underway 1
Correction of errors Leo Hobby + additional tasks Personal project
567 USD

  Latest proposals 10
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2000 USD
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5000 USD