Christian Weinbörner - Business Analyst and Product Owner

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Dortmund, Germany

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Experience

Feb 2024 - Present

2 years 8 months

Berlin, Germany

Interim Business Analyst / Product Owner

Bundesdruckerei GmbH (via FourEnergy GmbH)

Initial assessment of requirements based on a business value prioritization framework
Identification of issues as well as requirement gathering and evaluation using UML, BPMN, and design thinking methods for iterative requirements analysis through interviews and workshops
Use of user story mapping in Miro to visualize and align functional requirements (e.g. correct transmission of all application data and attachments to the specialist system) as well as non-functional requirements (e.g. complete and verifiable deletion of an applicant's data) with stakeholders
Proactive stakeholder management of internal and external stakeholders from public authorities, business units, organizations, and companies
Preparation of status reports to communicate project progress and upcoming tasks transparently
Responsibility for a REST-based integration solution (middleware) for secure data exchange between core systems and external specialist applications; ensuring stability and performance in day-to-day operations
Support for Product Owners in prioritizing backlog items and in product discovery
Communication of planning to internal and external stakeholders as well as interim assumption of Product Owner tasks and responsibilities during a staff change

Jan 2024 - Dec 2025

2 years

Developer

VaultLabs.ai

Development and design of VaultLabs.ai, a highly secure AI chat solution for companies and organizations to process highly confidential data
Focus on zero-knowledge data architecture, local AI model hosting, and compliance with German data protection guidelines to ensure digital sovereignty
Strategic focus on open source and digital sovereignty, including active contributions to the open-source community
Architecture and implementation of a zero-knowledge platform with end-to-end encryption to secure data confidentiality throughout the entire processing flow
Integration of local, self-hosted models to ensure that data is processed only locally
Implementation of granular role-based access control (RBAC) and detailed audit trails for compliance purposes
Ensuring responsive design and a seamless user experience across desktop, laptop, and mobile devices by using a modern web framework
Development and optimization of Retrieval-Augmented Generation (RAG) pipelines to enrich large language models (LLMs) with specific knowledge and enable precise, relevant responses

Jan 2024 - Dec 2024

1 year

Developer

FixThisBug.de

Development of a system for generating multilingual and context-sensitive error descriptions (German/English) to give users precise and easy-to-understand feedback and support effective troubleshooting
Development and operation of Supabase as a central data platform to support storage as well as the management of analysis and correction data
Implementation of Docker containers to standardize the development, test, and production environments, which led to more reliable platform delivery
Design and implementation of automatic code correction mechanisms with syntax highlighting to provide clear visual feedback and maximize the clarity of corrections
Implementation of a real-time code analysis engine using AI models to automatically check for errors and optimization potential
Integration of LLM backends (Ollama and vLLM) for flexible and high-performance code analysis and correction to improve efficiency and precision
Building an interactive learning component with a knowledge base for error prevention and the long-term, sustainable improvement of code quality
Support for a wide range of programming languages to provide a versatile and universally usable code analysis and correction platform

Apr 2022 - Oct 2023

1 year 7 months

Berlin, Germany

Interim Product Owner

Bundesdruckerei GmbH (via Questax AG)

Coordination and development of an overarching product vision with other Product Owners in the Bundesportal project as well as with the client using the Product Vision Canvas to sustainably advance the IT service portfolio
Gathering, documenting, and consolidating requirements using UML and BPMN for the detailed modeling of the sub-product "case management" as part of the implementation of the Online Access Act (OZG)
Organization and delivery of regular workshops as part of product discovery with client-side stakeholders from various federal authorities to present, discuss, and validate project results
Use of user story mapping in Miro to visualize and align product ideas with the client and end customers
Integration of design thinking methods for the continuous analysis, development, and business validation of interactive prototypes regarding the achievement of business goals using real use cases from live operations in close collaboration with UX/UI designers
Preparation of results in the form of decision-making bases and optimization proposals for the business concept and system architecture
Quarterly review of goals and expectations with the client, development team, and management to analyze work results, identify improvement potential, and ensure compliance with quality standards throughout the project
Regular consultation of the client and internal stakeholders on prioritizing new and changed requirements as well as their classification within the long-term product vision

Jan 2020 - Present

6 years 9 months

Founder and Managing Director (part-time)

Weinbörner UG

Part-time consulting and support for companies in the areas of AI, data integration, and business analytics
Development of custom solutions for automated ETL processes of business data and subsequent AI integration for data analysis
Planning, design, and implementation of a platform for AI-supported bug fixing ([link]
Product launch of a platform for secure AI use for highly sensitive and private data ([link]

Jun 2019 - Feb 2022

2 years 9 months

Dortmund, Germany

Product Owner

IHK-GfI mbH

Responsible for developing the web app prototype and testing it with pilot customers, including planning and carrying out business tests to evaluate functionality and user acceptance, as well as continuously adapting the prototype based on test results and feedback
Developed the product vision and strategy in workshops with pilot customers and the development team using User Story Mapping and Product Vision Canvas to modernize the existing IT service portfolio
Presented early product ideas in the form of product pitches and demonstrated the prototype at IHK GfI C-level as well as to pilot customers
Regularly validated designs and prototypes through business tests and user feedback with the help of Design Sprints to continuously improve usability and functionality
Used Miro and Business Model Canvas to validate and continuously adapt the product idea with stakeholders, especially technical experts, subject matter experts, and pilot customers of the IHKs, in Design Thinking workshops
Shaped the business architecture by creating business concepts as well as the application architecture by defining use cases
Planned and carried out improvement and feedback workshops with end customers as well as targeted stakeholder communication with subject matter experts and decision-makers, including the use of User Story Mapping to collect requirements and feedback
Designed and implemented an AI use case for an automated approval process for timesheet billing by auditors with the help of machine learning

Feb 2015 - May 2019

4 years 4 months

Mülheim, Germany

Senior Project Associate

ALDI International Services GmbH & Co. oHG

Developed business concepts and use cases to further develop the product portfolio and translated them into user stories and test cases as input for the development team within a hybrid project using waterfall and agile development
Modeled and visualized the business concepts with the help of UML and BPMN to clearly show the system architecture and processes for precise communication and technical planning
Documented customer feedback, requirements, and business concepts in Confluence to ensure a central and transparent information base for the entire project team
Carried out the international rollout of the mobile app as well as the related user trainings and workshops
Validated requirements together with customers through regular feedback sessions to ensure full coverage of customer needs
Coordinated external development partners to further develop interfaces and ensure compliance with quality standards and IT security guidelines
Introduced quality improvement measures with the external development partner to reduce errors and bugs in the application
Conducted workshops with central purchasing and the international subsidiaries to shape the vision and plan the next product release

Jan 2013 - Jan 2015

2 years 1 month

Dortmund, Germany

Embedded Software Entwickler

Fachhochschule Dortmund

Designed and developed a system for data collection and transmission via powerline communication
Implemented data integration protocols for heterogeneous sensor systems
Developed data models for efficient transmission of sensor data
Performed data analysis to optimize transmission quality

Jun 2010 - Dec 2012

2 years 7 months

Dortmund, Germany

Software Entwickler

Fraunhofer Institut für Software und Systemtechnik

Implemented data integration interfaces for medical devices in the AAL area
Developed data processing workflows for health data
Integrated heterogeneous data sources into a central platform
Maintained and supported the embedded Linux environment

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Retail, Government and Administration, Professional Services, Healthcare, and Education.

Information Technology

Retail

Government and Administration

Professional Services

Healthcare

Education

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Product Development, Information Technology, Business Intelligence, Quality Assurance, Research and Development, and Project Management.

Product Development

Information Technology

Business Intelligence

Quality Assurance

Research and Development

Project Management

Skills

Data Platforms: Etl Processes, Data Modeling, Devops & Ci/Cd, Gitlab, Docker, Terraform, Kubernetes
Data Governance
Integration Tools: Rest Apis, Event-Driven Architecture, Service Bus
Project Management: Jira, Confluence, Miro
Ai: Data Collection Pipelines, Rag, Embeddings, Mlops & Fine-Tuning
Databases: Relational Databases (Postgresql), Vector-Based Databases (Qdrant, Chroma)

Languages

German

Native

English

Advanced

Education

Sep 2010 - Sep 2014

University of Applied Sciences and Arts Dortmund

Bachelor of Science · Computer Engineering · Dortmund, Germany · 2.0

Certifications & licenses

Product-led Certification Course, Product-led Certification

Mind the Product

Scrum.org

International Software Testing Qualifications Board

International Requirements Engineering Board

International Software Testing Qualifications Board

Statistics

Experience

Total positions 9

Experience in Information Technology 10 y

Avg length 2 y 9 m

Longest experience 6 y 8 m

Global experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Interim Business Analyst / Product Owner, Developer, Interim Product Owner

Main industries Information Technology, Retail, Government and Administration

Main business areas Product Development, Information Technology, Business Intelligence

Qualifications

Highest degree Bachelor

Certifications earned 5

Profile

Member since

August 2025

Last update

August 2026

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Frequently asked questions

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Christian is based in Dortmund, Germany and prefers 100% remote projects.

Christian speaks the following languages: German (Native), English (Advanced).

Christian has at least 16 years of experience. During this time, Christian has worked in at least 8 different roles and for 9 different companies. The average length of individual experience is 2 years and 10 months. Note that Christian may not have shared all experience and actually has more experience.

Based on recent experience, Christian would be well-suited for roles such as: Interim Business Analyst / Product Owner, Developer, Interim Product Owner.

Christian's most recent position is Interim Business Analyst / Product Owner at Bundesdruckerei GmbH (via FourEnergy GmbH).

In recent years, Christian has worked for Bundesdruckerei GmbH (via FourEnergy GmbH), VaultLabs.ai, FixThisBug.de, Bundesdruckerei GmbH (via Questax AG), and Weinbörner UG.

Christian is most experienced in industries like Information Technology, Retail, and Government and Administration. Christian also has some experience in Professional Services, Healthcare, and Education.

Christian is most experienced in business areas like Product Development, Information Technology, and Business Intelligence. Christian also has some experience in Research and Development, Quality Assurance, and Project Management.

Christian has recently worked in industries like Information Technology, Government and Administration, and Professional Services.

Christian has recently worked in business areas like Product Development, Business Intelligence, and Project Management.

Christian holds a Bachelor in Computer Engineering from University of Applied Sciences and Arts Dortmund.

Christian has 5 certificates. Among them, these include: Product-led Certification Course, Product-led Certification, Professional Scrum Product Owner I, PSPO I, Agile Tester, and ISTQB Certified Tester Foundation Level Extension Agile Tester.

The availability of Christian needs to be confirmed.

Daily rate distribution

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<€720 €800-880 €880-960 €960+

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Daily rate avg. 943 €

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Median rate 960 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.