Oleksandr – Node.js, PHP, Next.js, experts in Lemon.io

Oleksandr

From Ukraine (UTC+3)flag

Full-stack Web Developer|Strong senior

Oleksandr – Node.js, PHP, Next.js

Oleksandr is a seasoned engineer with over 11 years of experience, showing a clear professional growth from a strong PHP background to deep expertise in modern JavaScript ecosystems and Blockchain technology. He has hands-on experience integrating advanced AI models to address complex business challenges and a proven track record of successfully delivered Blockchain projects, including custom Chrome extensions.

Oles has designed and built scalable, real-time server architectures using Feathers.js and Socket.io, and developed high-performance front-end applications with Next.js, Lit, and vanilla JavaScript. His skill set also spans DevOps — containerization with Docker and Kubernetes, infrastructure management with Cloudflare, and CI/CD pipeline setup.

In recent years, Oles has contributed to both remote and in-house teams, mentoring junior developers and driving projects toward ambitious goals.

12 years of commercial experience in
AI
Automotive
Blockchain
Construction
Consumer goods
Cryptocurrency
E-commerce
E-learning
IoT
Logistics
NFT
Transportation
B2B
Marketplace
Mobile apps
SaaS
Web development
Software development
Main technologies
Node.js
6 years
PHP
5 years
Next.js
3 years
Solidity
3 years
React
2 years
Additional skills
Express.js
Feathers.js
Yii
Laravel
WordPress
Composer
GraphQL
HTML
CSS
JavaScript
Typescript
Knockout.js
AJAX
MySQL
MongoDB
Redis
Memcached
Ethers.js
Electron.js
OOP
SOLID
Nginx
Apache
Git
Gulp
Docker
Docker Compose
PostgreSQL
Kubernetes
CI/CD
Direct hire
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Experience Highlights

Full-Stack Engineer
Nov 2020 - Sep 20254 years 9 months
Project Overview

Car dealer “LubeAvto” is one of the leading companies specializing in car sales and purchases from major auctions in the United States and Europe. Contributed to the development of a Desktop application that displays information about incoming cars from US auctions.

The system allows users to track container delivery status and view the contents in real time. It continuously parses data from public sources to provide up-to-date information for end users.

Responsibilities:
  • Designed architecture;
  • Participated in sprint planning and task evaluation;
  • Developed the Client application's structure;
  • Defined the interface's communications between the Client and API;
  • Created Client modules with Next.js;
  • Refactored code;
  • Set up and configured dev and prod environments;
  • Mentored team members.
Project Tech stack:
Electron.js
Node.js
Next.js
Web API
Azure Functions
Back-End Engineer/Blockchain Engineer
Jun 2022 - Sep 20253 years 3 months
Project Overview

A mobile application that creates unique certificates and registers ownership of E-commerce assets on the Ethereum blockchain. To check the originality of the product, you need to scan the QR code from the label, after that the application will help to avoid counterfeits, as well as learn information about the product. Authorization by phone number, biometric authentication is possible.

Responsibilities:
  • Analysis and investigation of requirements;
  • Architecture design;
  • Development of the backend part;
  • Implementation of admin panel;
  • Deployment and configuring;
  • Direct communication with stakeholders and development team.
Project Tech stack:
Node.js
Feathers.js
Socket.io
MongoDB
PostgreSQL
Team Lead
Oct 2019 - Jul 20255 years 8 months
Project Overview

Dizmo uniquely connects data, services, and applications into a single interactive workspace. The product is focused on the B2B segment, serving large companies and factories such as Siemens, IBM, and others. The main goal of the business is to simplify processes and enhance workflow visualization for its clients.

Responsibilities:
  • Lead the development and support of different app components (widgets) used to create an interactive workspace;
  • Ensured proper architecture, integration, and behavior between dizmos (widgets) and their connections to backend data;
  • Reviewed and maintained high-quality code standards across HTML, CSS, JS, and iframe implementations;
  • Guided and supported engineers;
  • Ensured smooth, accurate behavior of widgets;
  • Identified potential bottlenecks or issues;
  • Coordinated with backend engineers to guarantee proper integration;
  • Communicated progress, technical challenges, and propose solutions during demos and meetings.
Project Tech stack:
JavaScript
Gulp
Mocha
HTML
CSS
Full-Stack Engineer/Blockchain Engineer
Nov 2024 - Jun 20256 months
Project Overview

Web marketplace for buying and selling NFTs for online games, using a seamless and secure blockchain integration. The platform supports user authentication, real-time listings, and smart contract transactions. Features include an intuitive UI, wallet connectivity, and automated royalty payments for creators.

Responsibilities:
  • Project architecture design and implementation;
  • Participation in sprint planning and task evaluation;
  • Direct communication with the customer;
  • Code refactoring and improvements;
  • Smart Contract(Solidity) development & deployment;
  • LayerZero bridging ERC-20 token implementation;
  • LAOS bridgeless NFT minting;
  • Hedera network account activation.
Project Tech stack:
Solidity
Next.js
Typescript
Ethers.js
Full-Stack Engineer
Oct 2024 - Dec 20242 months
Project Overview

Proof of Concept for an AI-driven tool designed to streamline safety training for contractors. This solution ensures that workers receive only the most relevant and up-to-date safety information, improving compliance and overall site safety.

Responsibilities:
  • Analysis and investigation of requirements;
  • Architectural design;
  • Development of the Back-End part;
  • Building and configuring;
  • Code refactoring and improvements.
Project Tech stack:
Claude LLM
React
Node.js
MongoDB
Full-Stack Engineer/Blockchain Engineer
May 2023 - Sep 20233 months
Project Overview

A WEB application that provides NFT services based on the Ethereum network. A user can connect an existing blockchain wallet or create a new one. The authorized user can create an unlimited number of collections, generate marketing websites, use storage for any media files related to the product, and generate an NFT token.

Responsibilities:
  • Analysis and investigation of requirements;
  • Architectural design;
  • Development of the backend part;
  • Implementation of admin panel;
  • Deployment and configuring;
  • Direct communication with stakeholders and development team.
Project Tech stack:
Next.js
SCSS
HTML
MongoDB
Node.js
WebSocket
Solidity
IPFS
Nginx
pm2
Swagger
Postman

Education

2012
Computer Science
Bachelor's

Languages

English
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