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Denys Chepiha

Founder, CHEPIO.TECH

Building
web apps
that matter

Founder, CHEPIO.TECH · Senior Software Engineer · 10+ Years

I'm Denys Chepiha, a Senior Software Engineer and the founder of CHEPIO.TECH in Leoben, Austria. Since 2015, I've built web products, cross-platform applications, and scalable systems. My current work focuses on research software, AI and LLM integration, and scientific workflows.

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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

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
  • Python backends with Django or FastAPI
  • Rust services with Actix Web or Rocket
  • Cross-platform desktop applications with Tauri
  • Docker containers & Kubernetes deployment
Learn more Fullstack Engineering

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

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

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.

My colleagues are ready to work with startups and growing businesses in Austria, the DACH region, and worldwide.

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

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Delivery system

From idea to production, without blind spots.

Every project follows a transparent delivery system. You always know what is being built, why it matters, what comes next, and where the project stands.

  1. Discover & align

    Active

    We define the real problem, business goals, users, constraints, risks, and success criteria before committing to a solution.

    Outputs
    • Project brief
    • Risk map

  2. Architect & estimate

    I turn discovery into a clear scope, technical direction, delivery roadmap, timeline, and written estimate.

    Outputs
    • System direction
    • Delivery roadmap

  3. Build & validate

    The product is built in short, testable iterations. You see working software regularly, so feedback arrives before decisions become expensive.

    Outputs
    • Working increments
    • Weekly demos

  4. Launch & evolve

    Deployment, monitoring, documentation, handover, and post-release support are part of the delivery, not an afterthought.

    Outputs
    • Production release
    • Observability & support
  • 04 stages
  • Weekly demos
  • Production handover
  • Post-launch support
Portfolio

Projects

Websites, online stores and product interfaces. Explore the work and my part in each project.

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EdTech · Full-Stack2026

School CHEPIO.TECH

A learning platform with student and admin dashboards, payments and live classes. I designed and built the first version, which is still in development.

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E-Commerce · Full-Stack2026

Print CHEPIO.TECH

A custom apparel printing service with single-item orders and a simple Telegram ordering flow. I created the product and built the website.

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Telegram · Full-Stack2026

CR Arena

A Telegram Mini App for community Clash Royale tournaments, with brackets, rankings, an in-app wallet and admin tools. I designed and built it; launch work is ongoing.

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Offline · AudioProgressive Web App2026

Local Beat

An offline music and audiobook player that installs from the browser. Your own files stay on the device, with no accounts or subscriptions. I designed and built it.

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Offline · FitnessProgressive Web App2026

Box Timer

A boxing and workout interval timer that installs on a phone. Saved programs keep rounds, rest and instructions, and group sessions show who is working. I designed and built it.

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Desktop · OfflineDesktop app for macOS, Windows and Linux2026

File Forge

A desktop app for macOS, Windows and Linux that compresses PDFs and images and removes image backgrounds without uploading files. I designed and built it.

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Multilingual · Business2026

Martin Projekt Group

A multilingual website for a Swiss construction and renovation company. I handled the design, development and launch.

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2020

EnglishDom

An online English learning platform. I worked with the product team on lesson interfaces, public pages and video playback.

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Accessibility · Government2018

Prozorro

Frontend work on Ukraine’s public procurement platform. I contributed accessible interface components as part of the Mavinx team.

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2021

Home Wet Bar

An online store for barware and personalised gifts. I contributed product, personalisation and checkout interfaces with the RMG Media team.

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2021

BigFig Mattress

A mattress store with product and checkout flows. I contributed storefront components and mobile improvements with the RMG Media team.

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Accessibility2025

Genetec UI Kit

A technical assessment: an event-management demo with a data table, keyboard-accessible timeline and validated form.

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Denys Chepiha, founder of CHEPIO.TECH
About me

The engineer behind CHEPIO.TECH

I am Denys Chepiha, a Senior Software Engineer and the founder of CHEPIO.TECH in Leoben, Austria. I develop research software, AI-enabled applications, and cross-platform systems. I am currently unavailable for new projects; my colleagues are ready to help with your project.

Colleagues available for projects

Ready to buildsomething great?

I am currently unavailable for new projects. My colleagues are ready to help build your product, modernize existing software, or provide consulting. Send an inquiry to discuss the work.

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✓ Discuss your requirements✓ Agree on scope and timing✓ Flexible engagement models