Freelancer profile translated to English.

Description

Senior Freelance Developer with a focus on database architecture, PL/SQL, and REST API development. I design and operate data systems from scratch – on Oracle, MS SQL Server, PostgreSQL, and MySQL, in production environments with real-world requirements. Particularly strong when existing systems need to be understood, integrated, or migrated. Almost 40 years in the business, since 2026 with AI-powered workflow (Claude Code) – because experience and modern tools are not mutually exclusive.

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

iS-Software/kraftwerk.io,
Web, DB Developer Customer Portal, REST API
ENERGY AND UTILITIES
September 2021 - May 2026 (4 years and 8 months)
93 Regensburg, Germany
Maintenance/further development of an online portal for energy providers. Migration of the software to PHP8. Development with PHP, Bootstrap, JavaScript/Jquery, C#, and SQL based on Oracle.

Adaptation of the online portal to WCAG requirements
Conception and development of a REST API interface for exchanging customer data and migrating to new software.
Developments based on PL/SQL and use of AI (Claude Code)
Oracle PHP SQL Claude Code HTML5
SinkaComAG,
Web, DB Developer KYC and Ticketing System
BANKING AND INSURANCE
October 2020 - August 2021 (10 months)
Wiesbaden, HE, Germany
Maintenance and further development of a ticketing system in the banking environment using Neos/Flow. Conception and implementation of database queries.
Development of middleware software for the logistics sector using Neos/Flow as middleware data backend for an Android frontend app, import of Shopware CSV data, preparation of data for the app
PHP MSSQL Server HTML5 Neos/Flow backend-service-development
Hemmersbach GmbH & Co. KG,
Web, DB Developer for Ticketing System, Invoice Approval and Routing
SOFTWARE PUBLISHING
May 2009 - August 2020 (11 years and 3 months)
90 Nuremberg, Germany
Maintenance and further development of a workflow management tool based on MS-SQL Server, Access frontend, PHP frontend including Dojo toolkit and ExtJS. Use of other PHP and JavaScript frameworks (Symfony, Yii, ...)
Development of the DB backend for the approval of incoming invoices including complete routing to the correct employee based on cost centers, verification of the four-eyes principle and other company-specific parameters
PHP MSSQL Server Dojo Ext.js