Oleksandr Yusypenko

Oleksandr Yusypenko

Senior Full-Stack Developer & AI Integrations

Building scalable platforms with AI — from microservices to OLAP analytics. 8+ years delivering production-ready solutions across AI, e-commerce, healthcare, Web3 and beyond.

Book a Free Consultation

Trusted by Startups & Enterprises

Delivering high-quality solutions across industries and time zones

0+
Years Experience
0+
Projects Delivered
0+
Happy Clients
0
Countries Worked In

What I Do

Helping startups and businesses build exceptional products with AI-powered solutions and technical expertise.

AI Development
Looking for an AI developer? I build production-ready AI solutions with LangChain, RAG systems, and multi-agent architectures. From intelligent chatbots to complex knowledge retrieval systems — I deliver AI that works in the real world.
  • LangChain & AI Agents
  • RAG Integration
  • OpenAI/Anthropic API
  • Real-time AI Streaming
Learn more
Full-Stack Development
Need a full-stack developer? I build scalable web applications using NestJS, Next.js, TypeScript, and PostgreSQL. From MVPs to enterprise systems, I deliver clean, maintainable code that grows with your business.
  • Node.js & NestJS
  • React & Next.js
  • PostgreSQL & Redis
  • REST/GraphQL APIs
Learn more
Front-End Development
Need a front-end developer? I build pixel-perfect, performant interfaces with React, Next.js, TypeScript, and Tailwind CSS. Responsive designs, smooth animations, and accessible UI components.
  • React & Next.js
  • TypeScript
  • Tailwind CSS
  • Framer Motion
Learn more
Backend & Data Architecture
Need a backend expert? I build high-performance backends with NestJS, ClickHouse OLAP analytics on 70M+ row datasets, and microservice architectures. AI-augmented development workflow with Claude Code and TDD-driven AI for rapid, quality delivery.
  • ClickHouse & OLAP Analytics
  • Microservices Architecture
  • AI-Augmented Development
  • PostgreSQL & Data Pipelines
Learn more

Experience

8+ years of building scalable applications

Oct 2025 - Present|Germany (Remote)

Senior Full-Stack Developer

BinaryBuilders

Sole engineer owning 3-microservice data analytics platform with ClickHouse OLAP, 50+ materialized views and AI-powered data pipeline on 70M+ row datasets.

100-300%
70M+ Rows
50+ MVs
Next.js
React
TypeScript
Tailwind CSS
View details
Nov 2023 - Oct 2025|Germany (Remote)

Senior Full-Stack Developer

Filament

Built NestJS backend for Web3 airdrop governance platform and AI-powered Chrome Extension with LangChain integration — multi-chain transactions, campaign lifecycle, and intelligent form filling.

Multi-Chain
Event-Driven
NestJS Backend
NestJS
Express.js
Node.js
PostgreSQL
+12 more
View details
Nov 2022 - Nov 2023|Estonia (Remote)

Senior Full-Stack Developer

Primsell

Developed Web3 NFT e-commerce platform with 10K+ item support, IPFS storage and technical leadership.

10K+ Items
Team Leadership
Full NFT Lifecycle
NestJS
Node.js
PostgreSQL
Redis
+14 more
View details
Feb 2020 - Jan 2023|Ukraine

Senior Full-Stack Developer

LITSLINK

Built gamification platform for industrial employee productivity — 20+ chart modules, real-time WebSocket leaderboards.

20+ Charts
35% Faster
Real-Time
React
Next.js
TypeScript
MobX
+8 more
View details
Mar 2018 - Feb 2020|Canada (Remote)

Front-End Developer

GeeksForLess Inc

Developed healthcare analytics dashboard for Canadian hospitals with 100+ KPIs and schema-driven UI.

100+ KPIs
20+ Charts
Schema-Driven UI
Svelte
React
TypeScript
MobX
+9 more
View details

Featured Projects

A showcase of what I build

MealPlan.app

AI-Powered Meal Planning

50K+
Monthly Users
95+
Lighthouse Score

MealPlan.app

An AI-powered meal planning and recipe generation platform. Built with RAG technology to provide personalized nutrition recommendations based on user preferences and health goals.

RAG-powered meal planning with personalized recommendations

Full-stack architecture with NestJS backend and Next.js frontend

SEO-optimized with SSG/ISR for 95+ Lighthouse performance

Next.js
NestJS
TypeScript
PostgreSQL
Redis
LangChain
RAG
Stripe
Visit Live Site

Tech Stack

Modern technologies I use to build scalable, performant applications

Backend

N
Node.js
Ne
NestJS
Pg
PostgreSQL
Re
Redis
CH
ClickHouse
Fy
Fastify

Frontend

R
React
Nx
Next.js
TS
TypeScript
Tw
Tailwind
Sv
Svelte

AI & ML

LC
LangChain
RG
RAG
OA
OpenAI
CC
Claude Code
LG
LangGraph

DevOps & Tools

Dk
Docker
AW
AWS
Ve
Vercel
GH
GitHub
CI
CI/CD

Also experienced with

GraphQL
REST API
WebSocket
JWT/OAuth
MongoDB
Chart.js
RabbitMQ
OLAP
Langfuse
tRPC
Vector DB
Jest
Playwright
Git

Frequently Asked Questions

Common questions about my services and how I can help your business

AI developers typically charge $75-150/hour depending on expertise and project complexity. I offer flexible engagement models: hourly consulting, project-based pricing, or monthly retainers. For startups, I can also discuss equity arrangements. Let's talk about your specific needs to find the best fit.

Have more questions?

Let's Talk

Let's Work Together

Have a project in mind? Let's discuss how I can help you build something amazing.

Or reach out directly:

[email protected]WhatsAppLinkedIn