Oleksii R.
Verified expert
Top skills
Oleksii R.
Verified expert
Meet Oleksii ✨
A Full Stack Developer with 5.5 years of experience building scalable web applications using Node.js, TypeScript, and React across the entire development cycle from architecture selection to deployment. Oleksii writes clean, maintainable code with OOP principles, produces clear documentation, conducts code reviews, and covers code with unit tests, with a strong focus on system architecture and security best practices.
He has delivered production systems across SaaS, AI, cryptocurrency, and security domains. His projects include a smart lead generation platform for real estate professionals with automated outreach and AWS infrastructure, an AI-based desktop website builder with LangChain and OpenAI integrations and a cutting-edge SEO platform, an AI-powered algorithmic crypto trading system with KYC development and Web3 integration, and a two-factor authentication vendor-homeowner connection platform with payment gateway integrations.
Oleksii's core stack is Node.js with NestJS and Express on the backend and React with Next.js on the frontend, complemented by TypeScript throughout. He works confidently with PostgreSQL, MongoDB, Firebase, Docker, AWS, Azure, WebSockets, and modern testing tools including Cypress and Jest. He also brings experience with LangChain, OpenAI API, THREE.js, Electron, and Web3 integrations.
If you need a full stack developer who can own complex backend architecture, build polished frontend interfaces, and navigate AI integrations and blockchain environments with equal confidence, Oleksii is ready to deliver 🚀
Download the CVHard skills
JavaScript
TypeScript
Node.js
NestJS
Express.js
React.js
Next.js
Redux
Redux Toolkit
React Hook Forms
React Context
React Query
JSX
TSX
Material UI
Bootstrap
Tailwind CSS
THREE.js
Electron
Web3
LangChain
OpenAI API
Payment Gateway APIs
WebSocket
SQL
PostgreSQL
MySQL
Firebase
MongoDB
Docker
AWS
Azure
Nginx
Auth0
GitHub Actions
GitHub CI/CD
REST API Development
Software Architecture
Technical Documentation
TDD
FDD
Tools
Git
GitHub
GitLab
BitBucket
Postman
Unittest
Mock
Cypress
Jest
React Testing Library
WebStorm
JetBrains Products
Visual Studio
VS Code
Puppeteer
Fastify
Mailgun
Mapbox
Tracers
Shufti Pro
Soft skills
Communication
Responsibility
Perseverance
Problem solving
Team collaboration
Ownership
Attention to detail
Continuous learning
Smart Lead Generation Platform for Real Estate Professionals
Full Stack Developer
Project Description:
Developed full-stack features for a SaaS lead generation platform tailored to real estate professionals, integrating automated outreach tools and data sources. Enhanced system architecture, implemented new features, refactored backend code, integrated and maintained APIs, and supported AWS infrastructure and application deployment.
Tools & Technologies:
TypeScript, Node.js, NestJS, PostgreSQL, Fastify, Next.js, Material UI, Puppeteer, GitHub Actions, AWS, Mailgun, Payment Gateway API, Mapbox, Tracers
AI-Based Website Page Builder
Front-End Developer
Project Description:
Built the frontend for a desktop AI application that automatically generates responsive web pages from user-defined settings using LLMs and OpenAI integrations. Also developed frontend features for a companion SEO analytics platform with real-time performance insights and advanced optimization tools.
Tools & Technologies:
Next.js, React.js, Electron, Puppeteer, TypeScript, Tailwind CSS, Axios, Redux, Formik, LangChain, OpenAI API, WebSocket, Redis, Auth0, Payment Gateway API
Trading System
Full Stack Developer
Project Description:
Built frontend and backend features for an AI-powered algorithmic trading system that automates decentralized market execution and replicates leading crypto portfolio strategies for fast, efficient transactions. Developed KYC verification flows, improved system architecture, and handled application deployment.
Tools & Technologies:
React.js, Node.js, Express.js, TypeScript, React Context, Axios, MongoDB, Web3, Blockchain, Shufti Pro
Platform for Connection Vendors with Homeowners
Full Stack Developer
Project Description:
Built and maintained a full-stack platform designed to simplify two-factor authentication for team members connecting vendors with homeowners. Developed system architecture, implemented frontend and backend features, integrated payment gateway and third-party APIs, and maintained code quality through unit testing and code reviews.
Tools & Technologies:
Express.js, React.js, Node.js, React Context, Axios, Material UI, Payment Gateway API, Formik, Docker