Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Java Backend Developer | Spring Boot & Security | Computer Mathematics Graduate I am a Java Backend Developer with a strong analytical background. I hold a Bachelor of Computer Mathematics from Jagiellonian University and am currently pursuing a Master’s in Applied Computer Science at the University of Economics in Cracow. Currently, I work at Futurum Technology, where I focus on developing robust backend solutions. My recent work involves migrating legacy systems to Spring Boot 3.5 and architecting secure authentication layers using JWT. I am passionate about writing Clean Code and designing scalable REST APIs. Core Skills: Java 17+, Spring Boot, Hibernate, SQL, Docker, CI/CD.…Java Backend Developer | Spring Boot & Security | Computer Mathematics Graduate I am a Java Backend Developer with a strong analytical background. I hold a Bachelor of Computer Mathematics from Jagiellonian University and am currently pursuing a Master’s in Applied Computer Science at the University of Economics in Cracow. Currently, I work at Futurum Technology, where I focus on developing robust backend solutions. My recent work involves migrating legacy systems to Spring Boot 3.5 and architecting secure authentication layers using JWT. I am passionate about writing Clean Code and designing scalable REST APIs. Core Skills: Java 17+, Spring Boot, Hibernate, SQL, Docker, CI/CD.

Karol Bargieł

Back-End Developer, Web Developer, Database Developer





Java Backend Developer | Spring Boot & Security | Computer Mathematics Graduate I am a Java Backend Developer with a strong analytical background. I hold a Bachelor of Computer Mathematics from Jagiellonian University and am currently pursuing a Master’s in Applied Computer Science at the University of Economics in Cracow. Currently, I work at Futurum Technology, where I focus on developing robust backend solutions. My recent work involves migrating legacy systems to Spring Boot 3.5 and architecting secure authentication layers using JWT. I am passionate about writing Clean Code and designing scalable REST APIs. Core Skills: Java 17+, Spring Boot, Hibernate, SQL, Docker, CI/CD.…Java Backend Developer | Spring Boot & Security | Computer Mathematics Graduate I am a Java Backend Developer with a strong analytical background. I hold a Bachelor of Computer Mathematics from Jagiellonian University and am currently pursuing a Master’s in Applied Computer Science at the University of Economics in Cracow. Currently, I work at Futurum Technology, where I focus on developing robust backend solutions. My recent work involves migrating legacy systems to Spring Boot 3.5 and architecting secure authentication layers using JWT. I am passionate about writing Clean Code and designing scalable REST APIs. Core Skills: Java 17+, Spring Boot, Hibernate, SQL, Docker, CI/CD.

Available to hire

Krakow, Poland

Java Backend Developer | Spring Boot & Security | Computer Mathematics Graduate

I am a Java Backend Developer with a strong analytical background. I hold a Bachelor of Computer Mathematics from Jagiellonian University and am currently pursuing a Master’s in Applied Computer Science at the University of Economics in Cracow.

Currently, I work at Futurum Technology, where I focus on developing robust backend solutions. My recent work involves migrating legacy systems to Spring Boot 3.5 and architecting secure authentication layers using JWT. I am passionate about writing Clean Code and designing scalable REST APIs.

Core Skills: Java 17+, Spring Boot, Hibernate, SQL, Docker, CI/CD.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Language

Polish

Fluent

English

Advanced

Work Experience

Junior Implementation Specialist at INNERGO

July 1, 2024 - August 1, 2024

Supported the implementation of IT systems in the medical sector. Configured software solutions ensuring full alignment with specific customer requirements. Assisted in the integration of various key IT systems. Provided ongoing technical support.

Mathematics Tutor at Tutore

December 1, 2024 - June 1, 2025

Demonstrated ability to simplify complex topics and mentor others, gained through individual tutoring experience.

Java Developer at Futurum Technology

June 1, 2025 - Present

Led a critical system migration from Spring Boot 2.7 to 3.5, ensuring full Jakarta EE compliance across the codebase. Architected and implemented the authentication layer using Spring Security with robust JWT mechanisms. Drove the daily development of Java/Spring Boot backend modules, expanding and maintaining REST APIs. Managed secured database schema evolution and deployment of structural changes using Flyway. Actively supported CI workflows with Git/Bitbucket and Maven for build management.