Yevhen Berezanskyi

I build production-ready SaaS platforms and autonomous AI agent integrations.

Explore My Work

About Me

Summary

I am a results-driven Full Stack JavaScript Developer dedicated to building modern web applications and production-ready SaaS products. With deep expertise in React, Next.js, and Node.js, I bridge the gap between intuitive UI design and robust backend architecture. My experience spans the entire development lifecycle, from designing complex PostgreSQL schemas with Prisma to styling responsive interfaces with Tailwind CSS. I specialize in the critical features that power modern businesses, including secure JWT authentication, Stripe payment integrations for subscription models, and the implementation of AI-powered features using the Gemini API. Most recently, I engineered PropText.ai, a comprehensive SaaS platform featuring a credit-based user system and automated billing, fully deployed on Vercel. Whether I am refining a database query or integrating a new AI model, I focus on writing clean, scalable code that delivers a seamless user experience. Currently available for remote full-time or contract roles, I bring a full-time commitment to building innovative, high-impact digital solutions.

Education

  • 2023 - 2024

    Odessa National University named after I. I. Mechnikov

  • 2021 - 2023

    Odessa State Ecological University

  • 2017 - 2021

    Odessa Faculty College of Computer Technologies

Experience

  • 2023 - Present

    Freelance Full Stack Developer

    Building SaaS & CRM tools with Stripe and Gemini AI.

  • Jun 2024 - Sep 2024

    Web Systems Intern | ME "Marine Plast Center"

    Automation of IT systems and process management.

  • Jan 2024 - Jun 2024

    Intern Web Developer

    Frontend development and Agile teamwork.

  • Feb 2023 - Apr 2023

    Full-Stack Intern | Time Pro

    API integration and codebase optimization.

  • Jan 2021 - May 2021

    Junior Technician | Odesa College

    LAN networking and IT hardware support.

Skills

Frontend

React Next.js Redux Toolkit TanStack Query Tailwind CSS Bootstrap TypeScript HTML5 CSS3 JavaScript (ES6+) Canvas API Glassmorphism UI

Backend

Node.js (Express) Django REST Framework PHP REST API Nodemailer PostgreSQL (Prisma/Supabase) MySQL MongoDB

Infrastructure & Tools

Git GitHub Actions (CI/CD) Docker Vercel Postman Stripe Google Gemini API Python Automation

Auth & Security

JWT Supabase Auth OAuth Bcrypt

Core Competencies

System Architecture Automated Subscriptions Credit-based Billing OOP Agile/Scrum English (B1/B2)

AI & Automation

LLM API (Claude, Gemini, GPT) Model Context Protocol (MCP) Autonomous Agents Puppeteer (Web Scraping) Prompt Engineering JSON Schema Validation RAG Architecture

My Projects

PropText.ai

An AI-powered SaaS platform for generating professional real estate listing descriptions. Features include user authentication, credit-based billing system, Stripe payment integration, and AI-generated content using Google Gemini API.

Tech: Next.js, TypeScript, Supabase, Stripe, Google Gemini API, Tailwind CSS

View Demo

HuntFlow.ai

An AI-powered SaaS platform for recruitment automation and candidate scoring. Features automated resume parsing, compatibility scoring on a 100-point scale with detailed AI justifications, and outreach generation.

Tech: Next.js 15, Tailwind CSS, Framer Motion, Vercel AI SDK, Supabase JS, PostgreSQL

GitHub

SOW Proposal Creation Agent

A multi-agent AI system that parses unstructured client RFPs and meeting notes, automatically designs technical solutions, designs contest timelines, and exports structured SOWs to Word (.docx) and PDF.

Tech: Next.js, Node.js, pdf-parse, docx, @react-pdf/renderer, Tailwind CSS

GitHub

Invoice Processing System

An AI-powered Full-Stack document intelligence application. Extracts invoice data from PDFs and receipts using Gemini API in a background worker, and features an interactive context-aware chat assistant.

Tech: React, Express.js, Prisma ORM, SQLite, Google Gemini API, Tailwind CSS

GitHub

OpenClaw Framework

An advanced developer tool for orchestrating autonomous AI agents in isolated VM sandboxes. Features Google Gemini API key rotation to bypass rate limits, anti-bot obfuscation, and active Trello monitoring.

Tech: Node.js, Puppeteer Core, Yaml, Winston, Node-cron, Google Gemini API

GitHub

Freelance Scrapers

A suite of automated scraper scripts that monitor job boards (Freelancehunt, Djinni). Integrates Google Gemini API to analyze project details, score suitability, draft outreach letters, and send instant Telegram alerts.

Tech: Node.js, Puppeteer, Cheerio, Axios, Telegram Bot API, Google Gemini API

GitHub

AI Arena CE Orchestration

A web platform and management scripts for orchestrating neural-network agents in AI Arena matches. Renders combat telemetry graphs via ApexCharts, logs data in real-time, and integrates a CodeMirror viewer.

Tech: React, Axios, Tailwind CSS, ApexCharts, CodeMirror, Python, Docker

GitHub

Bank Statement Analyzer

An interactive web tool for analyzing CSV financial statements. Features drag-and-drop uploading, transaction search and sorting, Zod-based data validation, math calculations, and full unit test coverage.

Tech: Next.js, PapaParse, Zod Validation, Vitest, Tailwind CSS

GitHub

QuizMaster

An interactive full-stack quiz builder platform. It allows users to build and run quizzes with dynamic question types (boolean, inputs, checkboxes) and strict client-side and server-side Zod data validations.

Tech: Next.js, Express.js, Prisma ORM, PostgreSQL, Zod, Framer Motion, Tailwind CSS

GitHub

Commercial E-Shop

A comprehensive full-stack e-commerce application built with a separate frontend and backend. Features include secure user authentication (JWT), complex product filtering, cart management, and payment integration.

Tech: React (Vite), Django REST Framework, PostgreSQL, Tailwind CSS

View Demo

Car Dealer Inventory System

A comprehensive inventory management system for car dealerships with admin dashboard and public vehicle showcase. Features include vehicle CRUD operations, image uploads, advanced filtering, view tracking, and responsive design with glassmorphism UI.

Tech: PHP, MySQL, Bootstrap, JavaScript, InfinityFree Hosting

View Demo GitHub

Personal Portfolio

A responsive personal portfolio website featuring dark mode, interactive animations (Canvas/IntersectionObserver), and a dynamic project gallery. Built without frameworks to demonstrate core web fundamentals.

Tech: HTML5, CSS3 (Variables & Flexbox), Vanilla JavaScript

View Demo

Contact Me

Connect Directly

I'm available on popular messengers. Feel free to reach out to my phone number for quick questions or discussions.

+40 750 266 672