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Harald HerrmannsdörferHH

Harald Herrmannsdörfer

DB Developer

€550/day
Erlangen, DE
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Harald

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.
  • German

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • 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

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Education

  • null
    Gymnasium Fridericianum Erlangen
    1979
  • Software Developer
    null
    Software-Entwickler

Skill set

Categories