01/22/2026 updated
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100 % availableSenior Java Backend Engineer | Spring Boot | Legacy Modernization (C/C++/Perl → Java)
Phuket, Thailand
Only remote
Dipl. inf (FH)About me
Senior Java Backend Engineer mit Fokus auf Spring Boot und der Modernisierung von Legacy‑Systemen (C/C++/Perl → Java). Über 20 Jahre Erfahrung in Enterprise‑Projekten bei BMW, Siemens, NCR und Hausbank München. Stabil, präzise, zuverlässig.
Spring Framework
Backend & Core Development
Java (8–21)
Spring Boot
Spring Framework (Core, MVC, Data, Security)
Hibernate / JPA
RESTful APIs
Microservices
Maven / Gradle
Clean Code / SOLID / Design Patterns
Legacy‑Modernisierung (USP)Migration: C/C++ → Java
Migration: Perl/PHP → Java/Spring
Refactoring großer Monolithen
Modernisierung von Alt‑Systemen
Architektur‑Neudesign & Re‑Engineering
DatenbankenOracle
MySQL
PostgreSQL
SQL Performance Tuning
JDBC / JPA
Testing & QualitätJUnit
Mockito
Selenium
Integration‑ und Systemtests
CI/CD‑Pipelines
Cloud & DeploymentDocker
Kubernetes
Linux
Git / GitFlow
Jenkins / CI/CD
Frontend (nur ergänzend)HTML5
CSS
JavaScript
AngularJS (Legacy‑Support)
Tools & UmgebungIntelliJ IDEA
Eclipse
Jira
Confluence
Git / SVN
Enterprise‑ErfahrungBMW
Siemens
NCR
Hausbank München
Experience
Professional experience10+ years
Freelancer since2003
Languages
GermanNative speakerEnglishGoodGreekNative speaker
Project history
Project
Implementation of a JIRA Plugin
Description
Development of a JIRA plugin which processes the ticket of the BMW issue tracking tool and processes the tickets and imports them into JIRA.
Technology Java5, SQL, JDBC. Eclipse, XML, JAXB, Servlet, JSP, MYSQL, J5EE, Maven
Implementation of a JIRA Plugin
Description
Development of a JIRA plugin which processes the ticket of the BMW issue tracking tool and processes the tickets and imports them into JIRA.
Technology Java5, SQL, JDBC. Eclipse, XML, JAXB, Servlet, JSP, MYSQL, J5EE, Maven
Project
Further development of an Internet presence
Description
Development of an user management system.
Technology Java, SQL, JDBC. Eclipse, Hibernate, XML, SWING, Applet, Servlet, Spring, JavaScript, J2EE, J5EE, JSP, MYSQL, ER-Modelling, Eclipse-Spring Plugin, Eclipse Clay Database Modelling Plugin,CSS
Further development of an Internet presence
Description
Development of an user management system.
Technology Java, SQL, JDBC. Eclipse, Hibernate, XML, SWING, Applet, Servlet, Spring, JavaScript, J2EE, J5EE, JSP, MYSQL, ER-Modelling, Eclipse-Spring Plugin, Eclipse Clay Database Modelling Plugin,CSS
Description
Further development and bugfix of an existing retail system. The system is used by ALDI, NORMA and Bünting. Implementation of a free configurable ZIP tool. Implementation of a service which is used to transfer files between the POS and the server.
Technology
Java, SQL, JDBC. Eclipse, CVS, SVN, Hibernate, EJB 3.0, JBOSS XML, VMWare, Remote Debugging, Betwixt, JDOM, SWING, Applet, Servlet, Spring, J2EE, J5EE, AWT, SWING
Further development and bugfix of an existing retail system. The system is used by ALDI, NORMA and Bünting. Implementation of a free configurable ZIP tool. Implementation of a service which is used to transfer files between the POS and the server.
Technology
Java, SQL, JDBC. Eclipse, CVS, SVN, Hibernate, EJB 3.0, JBOSS XML, VMWare, Remote Debugging, Betwixt, JDOM, SWING, Applet, Servlet, Spring, J2EE, J5EE, AWT, SWING