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Zsolt Csigi

@zsoltcsigi

Backend Engineer at 4D Soft rebuilding a legacy billing system with Java 21 and integrating Hungarian Tax Authority reporting.

Hungary

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What I'm looking for

I'm seeking a Backend Engineer position where I can use my skills in data-driven solutions and process optimization to support the company's mission of enhancing financial inclusion and revolutionizing money management.

At 4D Soft, I rebuilt a legacy billing system with Java 21, optimizing processes and addressing architectural issues. I also developed REST APIs and automated PDF generation for invoices and service lists.

At 4D Soft, I developed invoice calculation modules integrated with the Hungarian Tax Authority reporting system, and synchronized data between Oracle and PostgreSQL. I redesigned relational data models as part of that migration.

For my AI-based Smart Waste Sorting System project at Diehl Group, I developed a prototype using TensorFlow Lite, Python, OpenCV, and Raspberry Pi 5. It detects and classifies waste in real time and uses GPIO to trigger sorting mechanisms.

Experience

Work history, roles, and key accomplishments

Current

Java Developer

Current

4D Soft

Mar 2026 - Present (7 months)

Rebuilt a legacy billing system using Java 21, optimizing processes and eliminating architectural issues. Developed RESTful APIs, automated PDF generation, and integrated with the Hungarian Tax Authority (NAV) reporting system.

Java 21+REST APIs PDF Generation Oracle PostgreSQL Hibernate WildFly Tomcat Agile AI Agents AI Powered IDEs

AI-based Smart Waste Sorting System

Diehl Group

Jan 2025 - Dec 2025 (11 months)

Developed an AI-powered selective waste sorting prototype using TensorFlow Lite and computer vision on Raspberry Pi 5. Implemented real-time object detection and classification, and integrated physical control via GPIO.

Tensorflow Lite OpenCV Python Raspberry Pi Computer Vision Embedded Systems Machine Learning IoT

Automation Engineer

Diehl Group

Jun 2024 - Dec 2025 (1 year 6 months)

Provided support to international teams by maintaining and developing automated documentation systems. Constructed database architectures in Access and MariaDB, and formulated data-driven automation solutions using Python, Power BI, and Excel VBA.

Python Power BI Excel VBA Access MariaDB SAP SQL Process Optimization Workflow Automation Data Analysis

Full Stack Developer

Mobile LBS

May 2021 - Jun 2024 (3 years 1 month)

Designed and maintained GPS-based services including real-time tracking, route history, and fuel consumption monitoring. Contributed to taxi dispatching software and executed IoT integration and API development.