Karoly Hornyak

Full-Stack Engineer

I build reliable syst

About

Hi, I’m Karoly — a full-stack engineer focused on turning ideas into reliable, production-ready software. I work comfortably across the entire development lifecycle, breaking down complex problems and delivering practical solutions that address real business needs.

With expertise in both Front-end and Back-end technologies.

I’m currently exploring opportunities as a full-stack, frontend, or backend developer. I’m open to on-site or hybrid roles in London, as well as remote positions across England. Available immediately

Karoly is absolutely incredible at what he does! I needed my entire business website redone as I had tried to do my own and he completely transformed my page into a beautiful sleek and modern page which I am now proud to share. I was so indecisive and changed my mind a few times and no task was too big and he always had great ideas to help improve my original vision. Thank you to Karoly for turning my vision into a reality!

Nicky

Sparkling Willow Photography

Skills

Experience

Full-stack developer with 3+ years of experience building scalable, mobile-first web applications and API-driven systems. Strong background in JavaScript, React, Node.js, and SQL-based databases, with hands-on experience delivering maintainable solutions from concept to deployment.

Professional Experience

Full-Stack Web Developer · Self-Employed / Contract

2022 – 2025 · London / Remote

  • Designed, developed, and deployed full-stack web applications using React, Node.js, PHP, and SQL-based databases.
  • Built mobile-first, responsive user interfaces with HTML, CSS, Sass, and Bootstrap.
  • Developed RESTful APIs and integrated third-party services to extend functionality.
  • Translated client requirements into secure, maintainable, and high-performance solutions.
  • Managed projects end-to-end, from architecture and development to deployment and maintenance.
  • Delivered multiple client projects on time, incorporating iterative feedback.

Production Supervisor

2018 – Present · London

  • Oversee daily operations, production targets, safety compliance, and equipment maintenance.

Head of Sales Department

2014 – 2015 · Budapest

  • Led a 50-person team, improved efficiency, and managed B2B sales operations.

Site Operations Manager

2009 – 2013 · Szeged

  • Managed multi-site operations, supervised teams, ensured regulatory compliance, and improved efficiency.

Education & Training

Full-Stack Web Development Training

IT Career Switch Ltd · 2024

500+ hours covering React, Node.js, REST APIs, databases, authentication, and deployment.

Web Development Training

Programming & Career Ltd · 2021

HTML, CSS, JavaScript, Python, Node.js, databases, and responsive design.

Continuous Learning

Udemy · 2025

Modern PHP · React & Next.js · Redux

BSc Mechanical Engineering

University of Szeged · Hungary

Download CV

Featured Projects

A selection of my work, built with precision, usability, and performance in mind

Name day
API

Name Day API

Node.js, Express.js, JSON, Swagger, GitHub, Heroku

A simple REST API that provides name day information for the entire year, with filtering options by month, date, and country.

Live DemoGitHub
Gazetteer App
front-end app

Gazetteer

HTML, CSS, JavaScript, PHP, Leaflet.js, APIs

An interactive world explorer that lets users view real-time country data—including weather, news, borders, population, photos, and currency—powered by multiple public APIs and an interactive Leaflet map.

Live DemoGitHub
Name day
API

Form Submit Now

HTML, CSS, JavaScript, Node.js

A plug-and-play contact form API that lets developers send form submissions directly to email—no backend or database required.

Live DemoGitHub
Bank Holiday
web-app

Bank Holiday

React, Vite, JavaScript, CSS

A fast React + Vite app that fetches official UK bank-holiday data from the GOV.UK endpoint https://www.gov.uk/bank-holidays.json. Select a region and year to view accurate holiday dates in a clear, responsive interface.

Live DemoGitHub
SPW
website

Photography Studio

React, Vite, JavaScript, Sass, Node.js

A fully responsive photography studio Progressive Web App built with React, Node.JavaScript, and Sass, featuring dynamic image galleries, service and portfolio pages, client testimonials, and integrated contact and session-booking forms for seamless client enquiries.

Live DemoGitHub
DMF
website

Plumbing & Heating

React, Vite, JavaScript, Sass, Node.js

A responsive React + Node.js service Progressive Web App showcasing plumbing and heating offerings, detailed pricing, terms pages, and integrated contact options—built with a clean, professional UI using Sass.

Live DemoGitHub
Mary
website

Sewing Workshop

React, Vite, JavaScript, Sass, Node.js

A multilingual tailoring Progressive Web App built with React, Node.JavaScript, and Sass, featuring service pages, and a clean responsive layout, with seamless language switching for English and Hungarian visitors.

Live DemoGitHub

Contact Me

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