Available for new projects - Leoben, Austria
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Building
web apps
that matter

Founder, CHEPIO.TECH · Senior Full-Stack Engineer · 10+ Years

I'm Denys Chepiha, a senior full-stack engineer and the founder of CHEPIO.TECH in Leoben, Austria. Since 2015 I've shipped web products - from e-commerce storefronts to Prozorro, Ukraine's public procurement system. I build fast web apps with Next.js and React, integrate AI into products, and support companies as a fractional CTO.

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Denys Chepiha

Founder, CHEPIO.TECH

10+Years of Experience
50+Technologies
100+Projects Delivered
15+Certifications (Meta, IBM)
Services

Web Development Services

End-to-end engineering from architecture to deployment - delivered from Leoben, Austria to clients worldwide

01Frontend Web Development

Frontend Development

I build pixel-perfect, high-performance UIs with React and Next.js - including server-side rendering (SSR), static generation (SSG), and the App Router.

I build production-grade frontends that perform at scale. From complex SPAs to content-heavy SSR sites, I bring deep expertise in the React ecosystem with a relentless focus on performance, accessibility, and code quality.

Learn more Frontend Development
  • React
  • Next.js
  • TypeScript
  • Tailwind CSS

Discovery

Understand requirements, review design assets, define technical approach.

Architecture

Plan component structure, routing, state management, and data flow.

Development

Build with clean, typed, well-tested code. Weekly demos and feedback cycles.

02Full-Stack Software Development

Fullstack Engineering

I design and ship end-to-end systems with Node.js, NestJS, PostgreSQL, and MongoDB - REST and GraphQL APIs built to scale.

Complete full-stack development from database schema to pixel. I design and build robust backend systems with clean APIs, then connect them to performant React frontends.

What's included

  • Node.js with Express or NestJS
  • REST & GraphQL API design
  • PostgreSQL, MongoDB, Redis
  • Authentication: JWT, OAuth2, sessions
Learn more Fullstack Engineering
  • Node.js
  • NestJS
  • PostgreSQL
  • Docker

System Design

Database schema, API contracts, and service architecture.

Backend

API development with proper validation, error handling, and tests.

Frontend

React and Next.js UI connected to the backend via type-safe API clients.

03AI Integration Services

AI Integration

I integrate large language models (LLMs) into products: retrieval-augmented generation (RAG) pipelines, vector search, and AI-driven automation.

I integrate AI capabilities into web applications - from simple LLM-powered features to complex RAG systems with semantic search. Practical AI that solves real business problems.

What's included

  • LLM integration (OpenAI, Anthropic, open-source)
  • RAG pipelines with vector databases
  • Semantic search (pgvector, Pinecone, Weaviate)
  • AI chat interfaces and streaming responses
  • Production monitoring: accuracy, latency & hallucination tracking
  • Automated knowledge base sync & document indexing
  • Multi-provider integration (OpenAI, Claude, Gemini)
  • Secure API gateway with authentication & rate limiting
  • Workflow automation for support & operations tasks
  • CI/CD pipelines for model & deployment updates
Learn more AI Integration
  • OpenAI
  • Python
  • Vector DB
  • RAG
  • LangChain
  • Automation
  • Claude Code
  • Pinecone

RAG & Search

Relevant answers with sources

AI Automation

Workflows automated intelligently

Scalable Integration

Securely integrated into existing systems

04Web Performance Optimization

Performance Audit

I audit Core Web Vitals, cut JavaScript bundle sizes, and deliver measurable load-time improvements with before/after numbers in a written report.

A systematic audit of your web application's performance with a concrete action plan. I identify bottlenecks, implement fixes, and deliver measurable improvements to Core Web Vitals.

Learn more Performance Audit

Baseline Metrics

Establish current performance scores across key pages.

Deep Analysis

Profile runtime, analyze bundles, identify root causes.

Prioritize

Rank issues by impact and effort. Create actionable roadmap.

05Technical Mentoring

Technical Mentoring

I coach developers 1-on-1 and run team workshops, architecture reviews, and growth programs that take engineers from junior to senior.

Structured mentoring for developers who want to grow faster. Whether you're a junior aiming for mid-level or a mid-level targeting senior, I provide the guidance, feedback, and accountability to get there.

Learn more Technical Mentoring
  • React
  • TypeScript
  • Next.js
  • JavaScript

Assessment

Evaluate current skills, goals, and areas for growth.

Roadmap

Create a personalized 3-6 month learning plan.

Weekly Sessions

Consistent 1-on-1 meetings with agenda and homework.

06Fractional CTO Consulting

Tech Consulting

I advise on architecture, stack selection, legacy modernization, and technical due diligence - including fractional CTO engagements.

Strategic technical guidance for teams facing architecture decisions, technology migrations, or scaling challenges. I bring 10+ years of real-world experience to help you make the right call.

What's included

  • Technology stack selection & comparison
  • Architecture design & documentation
  • Legacy codebase assessment & modernization plan
  • Technical due diligence for acquisitions
  • Scalability planning
  • Code quality audit with recommendations
  • Team process & workflow improvement
  • CTO advisory (part-time engagement)
  • Technical hiring plan & engineering team build-out
  • Investor & stakeholder technical communication
Learn more Tech Consulting

Discovery Call

Understand the business context, team, and technical challenges.

Assessment

Review codebase, architecture docs, and interview key engineers.

Analysis

Identify risks, opportunities, and quick wins.

I work with startups and scaling products across Austria, the DACH region, and worldwide.

Clear scope, honest estimates, and code built to last.

Discuss a project
How I work

A process without surprises

Four steps from first call to launch - you always know where your project stands.

  1. 01

    Discovery

    We talk through your goals, audience, and scope. You get an honest assessment of what is worth building - and what is not.

  2. 02

    Plan & estimate

    A clear scope, timeline, and quote in writing. No vague day rates, no moving targets.

  3. 03

    Build & demo

    I build in short iterations and demo working software every week, so feedback lands early - not after launch.

  4. 04

    Launch & support

    Deployment, monitoring, and handover included. I stay available after release - your product keeps working.

Portfolio

Featured Work

Selected projects that showcase depth and scale

View All Projects
School CHEPIO.TECH
School CHEPIO.TECH
2026

Full-stack MVP of an online learning platform with a custom backend, student dashboard, admin panel, payments, credits, and live-class infrastructure. Built as the first product version to validate the concept, shape the architecture, and define the core business logic.

Next.jsReactTypeScriptTailwind CSSClerk
Case studyView Live
Print CHEPIO.TECH
Print CHEPIO.TECH
2026

Custom apparel and merch printing with no minimum order. Customers upload a design, pick a product, and get it in 1-2 business days. A CHEPIO.TECH product.

Next.jsReactTypeScriptTailwind CSS
Case studyView Live
Martin Projekt Group
Martin Projekt Group
2026

Production-ready corporate website for a Swiss construction company. Fullscreen video hero, 26-language localisation, animated stats, and Resend-powered contact form. Designed and built end-to-end as a CHEPIO.TECH service delivery.

Next.jsTypeScriptReactTailwind CSSFramer Motion
Case studyView Live
Prozorro Procurement System
Prozorro Procurement System
2018

Ukraine's national public procurement platform. Transparent, accessible government e-procurement - contributed to frontend as part of the Mavinx development team.

ReactJavaScriptCSS ModulesREST APIsWCAG
Case studyView Live
Genetec UI Kit - Event Manager
Genetec UI Kit - Event Manager
2025

Technical test assignment for Genetec. A reusable component library demo - DataGrid (pagination, sorting, filtering), Timeline (keyboard-navigable, ARIA-live), and Event Form (Zod validation) - all sharing state via Zustand.

ReactTypeScriptViteZustandTanStack Table
Case studyView Live
Denys Chepiha, founder of CHEPIO.TECH
About me

The engineer behind CHEPIO.TECH

CHEPIO.TECH is the web development studio of Denys Chepiha - a senior full-stack engineer with 10+ years of experience - founded in 2026 in Leoben, Austria. I work with clients directly, with no handoffs and no account managers: the person you talk to is the person who writes the code.

Available for new projects

Ready to buildsomething great?

Whether you need a new product built from scratch, a legacy system modernized, or expert consulting - let's talk.

Start a conversationView my work
✓ Free discovery call✓ Response within 24h✓ Flexible engagement models