Freelancer profile translated to English.

Description

I am a software engineer (M.Sc.) with over 7 years of professional experience in backend development, mainly with Java-based web applications.

My experience includes both legacy frameworks such as Apache Struts2 and modern frameworks such as Spring Boot.

I support companies in maintaining, expanding, and modernizing Java-based web applications – especially in the environment of Apache Struts2, Oracle SQL, and individual integrations.

My focus:

- Maintenance and further development of existing Struts2 applications (new features, security patches, performance optimization)

- Integration of external systems (REST/SOAP APIs, CSV, Excel, PDF)

- Automated data imports/exports and reporting (BIRT, JasperReports)

- Performance tuning for Oracle SQL and Java applications (10h performance package)

- Configuration of dynamic forms and workflows

- Migration from Struts2 to Spring Boot

I work completely remotely, speak fluent German and English, and deliver high-quality, maintainable code – on time and documented.

Industry field of expertise

Languages

Polish
Native or bilingual
English
Fluent
German
Fluent

Workplace preferences

Remote only

Primarily works remotely

Deborate GmbH
SOFTWARE DEVELOPER
February 2020 - Today (6 years and 4 months)
Germany
Development of web applications in JavaEE including:
• Implementation of new functionalities and modules, such as document management, advanced filter functions, data export in .xls, .pdf, .doc as well as dynamic report creation with BIRT and JasperReports.
• Configuration and adaptation of views, workflows and dynamic form fields via XML files to ensure flexible UI behavior.
• Integration of external systems (e.g. document management systems) via HTTP/HTTPS with support for multiple systems and modular architecture.
• Refactoring of legacy code to improve performance, maintainability and security (e.g. elimination of SQL injection vulnerabilities, performing penetration tests with SQLMap and adapting queries to injection resistance).
• Creation of abstract layers and reusable components to increase the scalability of the project.
Java Apache struts JavaScript SQL Apache Tomcat
FizzyComp
JUNIOR JAVA DEVELOPER
April 2018 - December 2019 (1 year and 8 months)
Kattowitz, Poland
• Development in Java, Spring, HTML5, TypeScript and Angular.
• Working with databases Oracle SQL and MS SQL Server.
• Software Testing: Unit Tests, TDD, Smoke Tests, BDD (Selenium, Junit, Cucumber).
• Collaboration with an international team.
• Work organization according to the Scrum methodology.
Java Typescript Angular TDD
EuvicSp. z o.o.
INTERNSHIP
July 2017 - August 2017 (1 month)
Gleiwitz, Poland
• Development of an HTML-to-PDF file converter in PHP.
• Software Testing: Comprehensive Unit Tests.

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MASTER OF SCIENCEINFORMATIK
University of Silesia in Katowice
2019
MASTER OF SCIENCEINFORMATIK
BACHELOR OF SCIENCEINFORMATIK
University of Silesia in Katowice
2018
BACHELOR OF SCIENCEINFORMATIK

Dawid Kupny

Full Stack Java Developer

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