Andreas (Gideon) Kosubek
Backend Developer
Experience
Backend Developer
Univention GmbH
- Developed a SCIM-compliant Python interface to connect external systems
- Expanded and enhanced UCS modules in Python
- Extended and newly developed Helm charts for container orchestration in Kubernetes
- Maintained and further developed CI/CD pipelines in GitLab
- Implemented automated tests with Pytest and Playwright
'Nubus' is based on a microservice architecture, relies on open source technologies, and runs in Docker containers.
UCS is an IAM complete solution based on Debian, used as an alternative to Microsoft's Active Directory. The work was characterized by the close integration of infrastructure and application logic.
Developer
Lightweb-Media GmbH
- Performed an Odoo version upgrade with manual adjustments in the PostgreSQL database
- Adapted and enhanced existing connectors to Mattermost and WooCommerce
- Developed a module to integrate with the Authentik authentication service for central user management and single sign-on
Software Developer
Freelancer
- Software development
- Database programming
Developer / Architect
Agrar Markt Austria
- Selected and extended Pygeoapi as a Python-based geodata server, including developing custom plugins
- Designed and implemented configuration and release management for data sources based on an Oracle database with an APEX web interface
- Optimized performance for processing and delivering large datasets in Oracle Spatial and via the OGC API
- Integrated an OpenLayers client with Mapbox style support for map visualization
- Requirements management and process analysis
- Administration of the Oracle development database
Developer
Vodafone Deutschland (im Auftrag von Trivadis)
- Technical enhancement and maintenance of the document output management system for customer communications
- Creation and adjustment of document templates using HTML and XSLT
- Close collaboration with the client for requirements management and process analysis
Migrated the system to AWS Cloud and rebuilt it as a REST-based web service over an API Gateway according to Swagger/OpenAPI.
Sabbatical – personal and professional development
Self-employed
- Travel through Estonia, Russia, Mongolia, China, Vietnam and Laos overland
- Worked as a German teacher in Vietnam alongside smaller web projects
- Professional development in backend development focusing on PostgreSQL and Python
Developer
Federal Motor Transport Authority
- Development of a flexible web application based on Oracle APEX for master data maintenance
- Use of meta tables for model description and APEX_ITEM for dynamic UI behavior
- Responsible for the administration of the Oracle development database
Technical Project Lead
Police authorities of Hamburg, Brandenburg, Baden-Württemberg and Hesse
- Technical and organizational management of an eleven-member development team
- Project planning and technical coordination
- Managing development processes and release cycles
- Responsibility for budget and resources
- Close communication with stakeholders
- Requirements management and process analysis
Senior Consultant
Trivadis AG
- Software and database development
- Technical project management
Developer
Police authorities of Hamburg, Brandenburg, Baden-Württemberg and Hesse
- Support and further development of a cross-state case management system
Developer
BMW
- Further development of a system for evaluating manufacturing issues based on Oracle APEX
- Modular extension and integration of interfaces to related systems
- Implementation of role-based input forms and reporting functions for different user groups
- Administration of the Oracle development database
Developer
SGL Carbon AG
- Development of a client/server application for systematic collection and analysis of customer feedback
- Automatic generation of PDF and Excel reports and email notifications
- Integration of an SAP interface for automatic import of master data
Developer
SGL Carbon AG
- Development of a web-based idea system using Oracle APEX for submitting and evaluating improvement suggestions
- Implementation of role-based forms and status tracking with automated notifications
- Administration of the Oracle development database
Software Developer
Freelancer
- Software development
- Database programming
Software Developer
Ebiscon Ltd.
- Software development
- Database programming
- Project planning
Software Developer
allesklar.com AG
- Software development
- Database administration and programming
- System administration and support
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Information Technology (19.5 years), Professional Services (6.5 years), Government and Administration (3.5 years), Manufacturing (2 years), Telecommunication (1.5 years), and Education (1.5 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Information Technology (19.5 years), Product Development (12 years), Project Management (7 years), and Quality Assurance (1 year).
Summary
I am a software developer with almost 20 years of experience, mainly in backend and database areas. What has driven me all these years is my passion for clean architectures, clear code, and solutions that not only work but also convince in the long run.
I have supported projects from idea to go-live – sometimes classically in a waterfall model, sometimes agile with a DevOps mindset. For many years, my focus was on Oracle technologies. I developed, analyzed, and optimized data models and program logic with SQL and PL/SQL and created frontends with Oracle APEX.
In recent years, Python has become my preferred tool for backend development. I have built APIs, automated tests, containerized applications, and set up and expanded CI/CD pipelines – always aiming to create robust, maintainable, and scalable systems.
I have also gained experience as a technical project lead – from team coordination and scheduling to communication with clients and business units. What matters to me is that in the end, technology and requirements really fit together.
If you are looking for someone who not only develops reliably but also thinks ahead, takes responsibility, and is happy to go the extra mile – I look forward to connecting.
Skills
Programming Languages
- Python
- Pl/sql
- Sql
- Java
- C#
- Xslt
- Html
- Javascript
- Bash
- Php
Api Design & Integration
- Rest
- Scim
- Swagger/openapi
- Ogc Api
- Soap (Project-specific)
- Sap Interfaces
Databases & Data Modeling
- Oracle Database (11g, 12c, Spatial)
- Postgresql
- Sql Server (2005, Compact Edition)
- Data Modeling
- Performance Tuning
- Stored Procedures
- Triggers
- Views
- Pl/sql Programming
Containerization & Deployment
- Docker
- Kubernetes
- Helm
- Gitlab Ci/cd
- Api Gateway
- Deployment Pipelines
- Configuration & Release Management
Test Automation & Quality Assurance
- Pytest
- Playwright
- Unit Testing
- Integration Testing
- Ci-based Test Processes
Frameworks & Tools
- Oracle Apex
- Pygeoapi
- Openlayers
- Apache Fop
- Entity Framework
- Apex Item
Version Control & Tooling
- Git
- Gitlab
- Svn
- Jira
- Confluence
- Sql Developer
- Toad
- Visual Studio Code
- Sql*plus
Processes & Methods
- Devops
- Agile Methods (Scrum/kanban)
- Itil
- Waterfall Model
- Requirement Analysis
- Architecture Design
- Technical Project Management
- Team Coordination
- Stakeholder Communication
Languages
Education
allesklar.com AG / IHK Bonn
IT Specialist in Application Development · IT Specialist · Bonn, Germany
University of Bonn
Computer Science · Bonn, Germany
Humboldt University of Berlin
Computer Science · Berlin, Germany
Profile
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