Portrait — Ing. Ľubomír Tkáč

Ing. Ľubomír Tkáč

Software Developer / Architect (Tester), Designer

Profile

Independent, resourceful, and detail-oriented software developer and architect with over 20 years of experience. I quickly grasp new technology — from embedded firmware through desktop and web applications to IoT/Azure architectures and modern AI-assisted development tools (Codex, Claude Code, Cursor, Copilot). Alongside my full-time role I also run my own business and design websites and online software that help people simplify their daily lives.

Work Experience

Jun 2006 — present

Software Developer / Architect (Tester), Designer

Hengstler s.r.o (Hengstler GmbH) — Kezmarok, Slovakia (Aldingen, Germany)
  • AI application architect — designing and developing applications using AI MCP and coding agents (Codex, Claude Code, Cursor, Copilot)
  • C# .NET Core 3.1 web application development using MS SQL, MySQL, Azure and the JIRA REST API
  • JIRA Software administration; database architect (MySQL, MS SQL)
  • Microsoft Azure IoT architecture design and implementation for Digital Factory, using Microsoft IoT SDK and Power BI for data analysis
  • Digital Factory implementation, IoT 4.0, predictive maintenance tools
  • Development of a new encoder type using Agile Software Development / SCRUM
  • Tessy — unit testing of embedded firmware (encoder) to apply for TÜV SIL 2/3 certification
  • ARM development boards, ARM Linux CUPS printer driver development (Raspberry Pi, Banana Pi…)
  • C# tool for collecting, analyzing and reporting production measurement data
  • Android and Linux CUPS printer driver development (USB/RS232/TCP-IP), API design
  • Microsoft WHQL printer driver certification, digital signature architecture for signing sources and applications
  • Firmware development for thermal printers (Black Fin, Visual DSP++), barcode/2D implementation
Dec 2019 — 2022

Software Developer

DOXXBet, s.r.o. — Žilina, Slovakia
  • Nases system implementation, C# programming
Sep 2005 — Nov 2005

Programmer (Tester)

Siemens PSE — Kosice, Slovakia
  • PERL test applications for a new 3G network system

Additional Work Experience & Projects

2026 — present

Deye-HomeMonitor — LiFePO4 battery & DEYE inverter monitoring

Complete automation, tooling and app for controlling and checking LiFePO4 batteries and DEYE inverters on Android and Windows (.NET MAUI, Visual Studio 2026), REST API, SQL database. — deyemonitor.sk

2019 — present

Unified e-shop administration system

An administration interface that brings 5 different e-shop platforms together in one system. (.NET 8, C#, web application, MySQL)

2016 — present

Restaurant management software

A comprehensive system for restaurant operations. (.NET C#, MySQL)

2011 — present

Restaurant daily menu creator

Software for creating and managing a daily restaurant menu. (Java, MySQL) — motorestdavid.sk

2009 — present

Order & stock management system for restaurants and bars

A custom system for managing orders and stock. (Java, MySQL) — koloseumbar.sk

2008 — present

Jukebox software

Design and development of jukebox software, with new features implemented continuously. (Java, MySQL, Microchip)

2015

Android app for Bluetooth monitoring

QT5 application for monitoring data transmitted over a Bluetooth connection.

2014

Intelligent home electricity system

System design based on Arduino development boards.

2013

Koloseum Bar Messenger

Android app for customer communication for the venue.

2010 — 2018

Koloseum Bar — Owner

Full ownership and operation of a restaurant/bar.

2008

Data mining application

Multithreaded Java application (up to 30 threads) for Windows/Linux with a MySQL database.

2007 — 2008

Go-kart timekeeping system

Design and implementation of a timekeeping tool. (C/C++, RS232 communication) — motokarytatry.sk

2005

Food server — Lineberger's Seafood

Gatlinburg, USA. Seasonal work, customer service.

2003 — 2004

Food server — Alamo Steakhouse

Gatlinburg, USA. Seasonal work, customer service.

Business

2018 — present

Co-Founder (with Martin Pavličko)

RotacneLasery.sk (2018) and related e-commerce stores — StriekacieZariadenia.sk (2020), Bufiky.sk (2021) and others: measuring equipment (rotary lasers, level instruments), airless spraying equipment, diesel heaters, synthetic ice and general EU trade goods
2006 — present

CEO

LTSolutions.sk — my own brand and software/web consulting practice
2006 — present

Design, development and management of web projects

My own software products — AINO (AI-generated council meeting minutes), eStazka.sk (electronic trip logs for hauliers), JKBMS.sk (BMS battery monitoring), DeyeMonitor.sk (Deye inverter and solar PV monitoring), BOZP Manažér (workplace safety agenda) and CNCLasery.sk (CNC engraving lasers) — plus 15+ other websites and online stores managed, see the full list below

See the full project & domain portfolio

Hardware Projects

2026

ESP32 board for LiFePO4 battery monitoring

Schematics and PCB design with an ESP32 — battery monitoring over Wi-Fi, web interface and REST API.

2016

Staircase light control

Arduino — board setup, PCB, design and programming.

2012

Complete jukebox hardware

Coin counter, touch screen, PCB design.

2006

Go-kart lap timing hardware

Special Arduino-based hardware for measuring go-kart lap times.

Technical Skills

Programming languages

C / C++8/10
Java7/10
C#7/10
XML7/10
SQL6/10
HTML6/10
PHP6/10
XSL6/10
PERL5/10
QT5 / C++5/10
Android SDK / ADT4/10
Turbo Pascal7/10
Visual Basic3/10
UML2/10

Databases & cloud

MySQL8/10
MS SQL5/10
Microsoft Azure / IoT SDK4/10
Oracle3/10
MS Access2/10

Operating systems

Linux (Ubuntu, Debian, Suse, Mint…)7/10
Windows XP / 7 / 8 / 107/10
Android7/10
MS DOS6/10
Windows CE5/10

Architecture & networks

HW architecture6/10
Wireless networks6/10
Bluetooth6/10
TCP/IP6/10
ADSL6/10
SW architecture4/10
Network architecture5/10
GSM / SIM cards4/10
Ethernet5/10
Cisco networking4/10
Firewall / Hubs-routers5/10

Hardware & firmware

ESP32 (schematics & PCB design) ARM development boards Raspberry Pi Banana Pi Arduino Microchip / MPLAB STM / Atollic Studio Visual DSP++ (Black Fin) Tessy — firmware unit testing

CAD / drawing

ArchiCAD Pro100

Tools, methodologies & AI-assisted development

Visual Studio .NET 8 / .NET MAUI JIRA Software (administration) SCRUM / Agile Eclipse (Java, C++) QT Creator Android Studio MPLAB X IDE NetBeans IDE Doxygen Understand C (static analysis) LINT Confluence Tortoise SVN Track+ (Allegra) LaTeX MS Office Codex Claude Code Cursor GitHub Copilot

References & Interests

Ruud Horbach — Software Engineer, Hengstler GmbH, Germany Misel Batmend — R&D Leader, Hengstler GmbH

Reference contact details are available upon request during personal contact.

My work is also my hobby. In my free time I enjoy basketball, volleyball and swimming, and I like skiing in winter. One of my favorite hobbies is also furniture design and making (lu8ino.sk) — I design websites and online software that help people simplify their daily lives.