Completed
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Hotel Ilios RMS
Reservation Management System
Hotel management software for reservations, clients, rooms, payments and reporting.
Software Engineer | Full-Stack Developer | IT Support
Hi, I'm Konstantinos Kargas.
I build practical software and web applications with Java and Spring Boot, with a focus on clean architecture, useful features and reliable user experiences.
ABOUT
Software built around real problems.
I am a Software Engineer with a broad computer engineering background and a strong interest in building practical, reliable software. My main focus is full-stack development with Java, Spring Boot, relational databases and server-rendered web applications.
I enjoy creating solutions that address real operational needs, from reservation and hotel management systems to public-facing websites, internal tools and workflow automation.
Beyond software development, I also have hands-on experience with IT support, networking fundamentals, hardware troubleshooting, virtualization, digital systems and technical operations.
I care about maintainable code, clear interfaces and understanding the full lifecycle of a project — from requirements and implementation to deployment, support and real-world use.
FEATURED WORK
Selected projects
Projects that demonstrate backend development, web development and solving real operational needs.
Spring Boot Projects
Applications and systems available on GitHub.
Completed
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CommissionFlow
Sales & Commission Management System
Business web application for managing sales representatives, receipts, commissions, reports, and structured data import/export.
Completed
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TerraMetrics
Climate Data Analytics Platform
Interactive climate analytics platform featuring global climate mapping, country comparisons, indicator visualizations, historical data exploration, and CSV/PDF-ready reports.
Completed
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Diploma Portal
Diploma Thesis Management System
Role-based university web application for managing diploma thesis topics, student applications, thesis assignments, submissions, supervision, and grading.
Completed
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ComplexLab
Complex Number & Matrix Computing
Interactive web application for complex number arithmetic and complex matrix operations, featuring dedicated visualizers and SQLite-backed calculation history.
Completed
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Enerlytics
Energy Consumption Analytics Platform
Energy analytics platform featuring ETL processing, interactive dashboards, consumption analysis, period comparisons, dataset management, and CSV/PDF-ready reports.
Live Websites
Published websites with live previews.
Live
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Hotel Ilios Website
Hotel Website
Hotel website built with Spring Boot and Thymeleaf.
Live
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Poppy & Captain's Retreats Website
Property Website
Poppy & Captain's Retreats website built with Spring Boot and Thymeleaf.
Other Projects
Additional software and practical work.
Completed
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WinOps Manager
Windows Administration & Optimization Utility
Windows administration utility for managing local policies, user accounts, system settings, network adapters, software packages, and maintenance tools, with asynchronous loading and performance-focused workflows.
EXPERIENCE & EDUCATION
Summer seasons 2018–2026 • 9 seasons
Reception & IT Support
Hotel Ilios • Lakka, Paxos, Greece
- Front-office operations: reservations, arrivals/departures, guest communication and payments.
- Coordination with booking channels, travel partners and day-to-day hotel operations.
- On-site IT support for computers, printers, Wi-Fi, networking, software and hotel technology.
- Website and digital operations support, photography/content, and development of practical software solutions for hotel operations.
Summer seasons 2020–2026
General Manager
Poppy Apartments & Captain’s House • Loggos, Paxos, Greece
- Managed reservations, payments, guest communication and day-to-day property operations.
- Coordinated bookings across online platforms, direct reservations and travel partners.
- Handled guest enquiries before and during stays, including check-in arrangements, requests and issue resolution.
- Managed technical issues related to Wi-Fi, networking, website functionality and other property technology.
- Supported website content, online presence and digital operations for both properties.
6 Oct 2025 – 9 Jun 2026
IT Support & Photography — Lance Corporal (Honorary Corporal)
Hellenic Army • Greece
- Provided technical support for computers, peripherals, software and network-related issues.
- Installed, configured and maintained workstations, while providing user support and troubleshooting.
- Assisted with hardware/system setup and other technical and communications-related duties.
- Supported administrative and secretarial operations, including the handling and organization of confidential and classified documentation.
- Performed photography and media-related tasks, including documentation and preparation of digital material.
Sep 2018 – Apr 2025
Integrated MSc in Computer Science and Engineering
University of Ioannina • Ioannina, Greece
- EQF Level 7 Diploma, 5-year Undergraduate Program.
- Grade: 7.3/10.
- Thesis: Virtual Environment and Interface with a Haptic Device for a Medical Simulator.
- Completed additional university coursework toward Pedagogical and Teaching Competence.
Sep 2015 – Jun 2018
High School Diploma
Paxos High School • Greece
- Final grade: 19.9/20.
TECHNICAL SKILLS
Tools I work with
Backend
Server-side development and application architecture
Java · Spring Boot · Spring MVC · REST · Maven
Frontend
Server-rendered and responsive web interfaces
Thymeleaf · HTML5 · CSS3 · JavaScript · Responsive Design
Data
Relational databases and data handling
SQLite · MySQL · SQL · Data Modelling · CSV Import / Export
Systems & IT
Operating systems, infrastructure and technical support
Windows · macOS · Linux · Networking · Virtual Machines · Hardware Troubleshooting
Hardware & Digital Systems
Computer engineering and hardware design fundamentals
Digital Systems · Analog Systems · VHDL · Verilog
Graphics & Game Development
Computer graphics, game development and 3D environments
OpenGL · C++ · C# · Unity · Blender
Tools & Deployment
Development, version control and deployment
Git · GitHub · Docker · IntelliJ IDEA · Eclipse · AWS
Languages
Spoken languages
Greek — Native · English — Cambridge C1 · French — Basic