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

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 and related e-commerce stores — measuring and spraying equipment
2006 — present

CEO

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

Design, development and management of web projects

15+ websites and online stores managed — see the full list below

See the full project & domain portfolio

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

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 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.