Willi Ziegenhagel - Data Analyst for Power BI and SQL

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Barsinghausen, Germany

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Experience

Sep 2023 - Present

3 years

Data Analyst

Analysis of process data
Data preparation with SQL
Development of reports & dashboards in Celonis

May 2023 - Aug 2023

4 months

Dashboard Designer and Power BI Expert

Designing audience-specific dashboards
Developing data models, DAX
Developing reports & dashboards in Power BI
Implementing row-level security

Oct 2022 - May 2023

8 months

Interim BI Manager & Product Owner

Supporting the development of a data strategy
Product owner for multiple data products
Development of data models, reports, DAX, RLS in Power BI
Creation of SQL views for data preparation

Mar 2022 - Oct 2022

8 months

BI Consultant

Development of data models and loading processes
Development of reports and dashboards with Power BI and integration into a marketing reporting platform

Mar 2022 - Oct 2022

8 months

Data Consultant

Responsibility for the data migration stream
Gathering and systematizing business requirements and dependencies
Defining work packages that make sense both functionally and technically

Mar 2020 - Feb 2022

2 years

Senior Analytics Consultant

Kaiser X Labs GmbH

Responsible for identifying, prioritizing, and implementing analytical use cases
Gathering and organizing business requirements and dependencies
Defining work packages that make sense from a business and technical perspective
Serving as a knowledgeable point of contact for analytics topics
Analyzing customer behavior to improve products
Developing metric models to guide teams

Oct 2018 - Feb 2020

1 year 5 months

Business Analyst & Scrum Master

Hexad GmbH

Responsible for the Scrum process and its correct implementation
Advising the Product Owner on requirement formulation
Facilitating Scrum ceremonies (Daily, Planning, Review, etc.)
Removing obstacles for the development team

Dec 2017 - Sep 2018

10 months

Scrum Master / Requirements Manager / BI Analyst

Hexad GmbH

Responsible for the Scrum process and its correct implementation
Advising the Product Owner on requirement formulation
Facilitating Scrum ceremonies (Daily, Planning, Review, etc.)
Analyzing requirements for feasibility and designing data architecture and models

Jan 2017 - Nov 2017

11 months

BI Consultant

mayato GmbH

Managing requirements, designing and implementing an application for internal company planning (cost center and cost type planning)
Implementing a management dashboard and an interface for adjusting permissions

Jul 2015 - Dec 2016

1 year 6 months

BI Consultant

mayato GmbH

Supporting project management in building a data lake pilot
Managing requirements, designing, and consulting on Big Data technologies (Cloudera tools, Impala, Hive, Spark, Oozie, Sqoop)
Setting up a data warehouse for risk management in SAP BW
Developing and quality-checking deliverables

Mar 2014 - Jun 2015

1 year 4 months

BI Consultant

mayato GmbH

Development of a planning application for sales and demand planning with SAP BW and SAP BW-IP

Industry Experience

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

Experienced in Information Technology and Professional Services.

Information Technology

Professional Services

Business Area Experience

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

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

Business Intelligence

Information Technology

Project Management

Product Development

Quality Assurance

Marketing

Summary

Focus on data analysis and visualization
Several years of experience in business intelligence projects
Certified Data Strategy Consultant
Certified Data Analyst (Microsoft Power BI Data Analyst)
Industry experience in the automotive, insurance, and retail sectors
Tools: Power BI, Tableau, SQL, R, Python

Skills

Methodical Skills

Moderation And Consulting 4 Years +++
Agile Project Management (With Scrum & Kanban) 4 Years +++
Traditional Project Management 6 Years ++

Technical Skills

Power Bi (Incl. Dax & Rls) 3 Years +++
Tableau 2 Years ++
Business Analysis 10 Years +++
Data Analysis And Visualization 7 Years +++
Sql (Ms Sql, Pl/Sql) 12 Years +++
Python 2 Years ++
R 1 Year +
Data Architecture And Modeling 5 Years ++
Adobe Analytics 3 Years ++
Atlassian Jira 4 Years +++

Languages

German

Native

English

Advanced

French

Elementary

Education

Mar 2010 - Feb 2014

Hanover University of Applied Sciences and Arts

Business Information Systems · Hanover, Germany

Sep 2005 - Jul 2008

Deutsche Telekom AG

IT Systems Management · Osnabrück, Germany

Certifications & licenses

Scrum.org

Certified Data Strategy Consultant

datentreiber.de

Statistics

Experience

Total positions 11

Experience in Information Technology 10.5 y

Avg length 1 y 2 m

Longest experience 2 y 11 m

Expertise

Recent roles Data Analyst, Dashboard Designer and Power BI Expert, Interim BI Manager & Product Owner

Main industries Information Technology, Professional Services

Main business areas Business Intelligence, Information Technology, Project Management

Qualifications

Highest degree Bachelor

Certifications earned 3

Profile

Created

November 2024

Last Update

July 2026

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Frequently asked questions

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Willi is based in Barsinghausen, Germany and prefers 100% remote projects.

Willi speaks the following languages: German (Native), English (Advanced), French (Elementary).

Willi has at least 12 years of experience. During this time, Willi has worked in at least 8 different roles and for 3 different companies. The average length of individual experience is 1 year and 2 months. Note that Willi may not have shared all experience and actually has more experience.

Based on recent experience, Willi would be well-suited for roles such as: Data Analyst, Dashboard Designer and Power BI Expert, Interim BI Manager & Product Owner.

Willi's most recent position is Data Analyst.

In recent years, Willi has worked for Kaiser X Labs GmbH.

Willi is most experienced in industries like Information Technology and Professional Services.

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

Willi has recently worked in industries like Information Technology and Professional Services.

Willi has recently worked in business areas like Business Intelligence, Information Technology, and Product Development.

Willi holds a Bachelor in Business Information Systems from Hanover University of Applied Sciences and Arts.

Willi has 3 certificates. These include: Professional Scrum Master, Certified Data Analyst (Microsoft Power BI Data Analyst), and Certified Data Strategy Consultant.

Willi is immediately available part-time for suitable projects.

Daily Rate Distribution

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The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

Average rates for similar positions

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Daily rate avg. 906 €

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Median rate 800 €

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.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.