Innovative and dedicated software developer, architect and mentor with experience in various fields and roles. Focused on long-term goals: quality, maintainability, smooth development process.

Not only creates clean, modular, maintainable code, but inspires and helps others to do the same, educates and supports young talents.

Enjoyed programming since teenager age and still does. Last achievement: learned Rust basics, created and published first crate, working on a larger multi-client system.

2023 –
– 2024

Test engineer – YottaDB LLC, contractor

Work on open-source database platform:

Create integration tests CSH Expect TCL MUMPS
Implement/fix platform modules C Rust

2023	Author – Side project: KolorWheel.rs Color palette generator for Rust, with egui.rs examples (similar to Kolorwheel.js): https://github.com/ern0/kolorwheel.rs/

2023	Principal C++ Developer – Harman-Kardon Kft. Maintain automotive modules and tests C++

2022 –
– 2023

Principal C Developer – AI Fleet Kft (USA-HU startup)

Create USA route map cache C Python AWS

Optimize solver algorithm C

2019 –
– 2022

Embedded Systems Developer – Heitec Kft

Test framework for testing the company’s own manufactured PC, generates print-ready report Python PDF

Create test applications and counterpart tester devices for embedded devices C C++

Implement healthcare product firmware C

2017 –
– 2019

Principal C++ Developer – CAE Engineering Kft

Implement flight simulator functions and tests C++ LUA

Design and implement data conversion tools Python

2019	Author – side project: ShrinkShot Utility which cut empty areas from an image, typically a screenshot of a program window C ImageMagick: https://github.com/ern0/shrinkshot

2016 –
– 2017

Full-Stack Developer, Quality Lead – EcoStudio Kft

Build microservices architecture application Node.js RabbitMQ Haxe RethinkDB

Create microservice tests Python Haxe

2015

Author – side project: Posixino

Re-implementation of Arduino framework and some important libraries and features for Mac and GNU/Linux C++ SDL2

Implemented features: serial, digital out, web client, web server, LCD, timer interrupt, Adafruit NeoPixel

It’s not an emulator, but it makes embedded development just as comfortable as regular C programming is. With Posixino, C code can be tested on Mac or Linux

Source: https://github.com/ern0/posixino

2013 –
– 2016

Senior Full-Stack Developer – Netavis Kft

Mobile-first web app for video monitoring system

Smaller utils in Java

2016

Author – Side project: KolorWheel.js

JavaScript library, palette generator using HSL color space

A KolorWheel object represents a color,

further objects can obtained

by calling absoulte and relative item generator methods,

finally resulting a palette

Source code and documentation with examples: https://github.com/ern0/kolorwheel.js/

2011 –
– 2013

Senior Embedded and Systems Developer – Intep Kft

Outdoor LED wall firmware, font, autokerning renderer C

Payment kiosk firmware C++ and GUI JavaScript

Modular datasheet creator system PHP HTML CSS PDF

2006 –
– 2011

Systems Architect, Developer – Porion Kft, Bitklub Kft

Digital television (DVB) SI/EPG inserter

system design and implementation C++
SI/EPG administration backend and admin UI PHP JavaScript
The competition is suspected us of stealing the EPG system of Conax, the industry leader software (which is slow and expensive)
In 2025, the system is still used at various cable providers

Video stream jukebox server design and implementation C++

2009	Author – side project: XmlGraph Utility which discovers given XML, then renders a visual documentation of it PHP HTML CSS GraphViz Source code available: https://github.com/ern0/xmlgraph

2007

Co-author – side project: iHome dataflow system

Home automation-purpose dataflow sytem prototype

Framework is written in minimal C++, using only stdlib and pthreads C++
Transpiler from DF script to C++ PHP C++
We created ca. 80 components C++

Mobile-first web UI JavaScript

Also created an editor UI concept JavaScript Raphaël.js SVG

source code: https://github.com/ern0/dataflow-editor-concept
presentation on YouTube (Hungarian, 25 mins): https://www.youtube.com/watch?v=s86zrAdW7Yc

2007	Co-author – side project: Plannr Collaborative spreadsheet concept and prototype backend engine PHP MySQL web UI JavaScript HTNL CSS general components, ca. 10-15 PHP Demand planning purpose components written by co-author

2000 –
– 2006

Full-Stack Developer, SEO expert, CTO – Index.hu Rt, Rakit Kft, Well-Press Kft

Design, implement, SEO and run touristic portal PHP HTML CSS SQL

Design and implement Google position rank monitoring tool for support and measure SEO results Java PHP HTML CSS SQL

Implement simple ad server PHP

1999 –
– 2000

Software Developer – Nokia Hungary Kft, NWSS

Creating games for WAP enabled mobile phones JAVA WML

File patents (ca. 2-3)

1996 –
– 1999

IT Department Leader (CIO) – Grabo Holding, Uniontext Kft.

Set up a complete software development and operation department almost from ground, run entire company’s IT

ISO 9001 compilant logistic system design and supervision

Preliminary cost calculation system design

1989 –
– 1996

Developer – Grabo Holding, Graboplast Kft.

Write business applications and modules for locally developed ERP system MUMPS

Create UI frameworks MUMPS

MS-DOS – Unix inter-system data transfer protocol design, implementation Assembler 8086

Stock Register Book system design, backend imeplementation dBase FoxPro

1989 –
– 1993

Széchenyi István Egyetem, Győr

Software Developer

1985 –
– 1989

Deák Ferenc SZKI, Győr

IT System Organizer