Freelancer profile translated to English.
Back to original languageAbout Denis
I support you as a Senior Java Developer in both the new creation and further development of your existing software. As a software architect, I am happy to advise you on the structure of your software.
My focus is in the area of backend development as well as rich clients. One of my qualifications is to quickly familiarize myself with software structures and processes.
I am happy to support you in modernizing your system: whether it's updates of libraries, migration of runtime environments such as application servers, or transformation into a desired target architecture using refactorings.
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Bundesamt für Wirtschaft und AusfuhrkontrolleSenior Software DeveloperPUBLIC SECTORMarch 2023 - June 2025 (2 years and 2 months)Eschborn, GermanyImplementation of legal changes in 8 specialist applications● Implementation of functionality using Eclipse RCP, Spring, and Hibernate● Optimization of database queries in OracleModernization of the technology stack● Update of the RCP Target Platform● Adaptation of the server component to a new Wildfly version● Conversion of JMS communication from HornetQ to ActiveMQ● Update of libraries, refactoring● Revision of authentication and authorization to mutualTLS
- eperi GmbHSystem ArchitectSOFTWARE PUBLISHINGMarch 2014 - December 2018 (4 years and 9 months)Pfungstadt, GermanyEncryption of data in Salesforce● Implementation of a proxy system for the two web interfaces and the API● Error analysis● Performance optimizationConversion of the company's own administration software to WebUI● UI conceptualization● Definition of software architecture and prototype development● Porting of existing functionality● Performance optimizationEncryption of data in Office 365● Prototype development of a proxy system for WebDAV and Microsoft internal data transfer● Prototype development of a proxy system for MAPI● Definition of software and system architecture● Implementation and error analysis● Performance optimizationExtension and adaptation of the company's own administration software● Functional extensions of the GUI and the backend● Conversion of communication from SOAP to RESTConversion of the build process from CruiseControl to Jenkins● Installation and configuration of Jenkins● Porting and adaptation of build scripts● Configuration of partial builds for the different products
- eperi GmbHSoftware DeveloperSOFTWARE PUBLISHINGNovember 2006 - February 2014 (7 years and 3 months)Darmstadt, GermanyEncryption of database tables in MS SQL Server● Development of a concept for data encryption● Implementation as CLR assembly or Java backend service● SQL query optimization of medical softwareGateway solution for authentication, authorization & SSO● Development of a modeling tool for process flows in Eclipse RCP● Implementation of a proxy system based on the Catalina engine● Implementation of IT security functionalities as process modulesExtension and adaptation of the company's own administration software● Functional extensions of the GUI and the backend● GUI revision● Standardization of views and dialogs using SWT● Implementation of a new design● Separation of components using RCP techniques● Separation of products and creation of automated build processes● Optimization of SOAP communication
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Education
- Computer Science GraduateTU Darmstadt2007