Marco Skulschus-Business Analyst, Data Warehouse Developer
Check rate
Experience
Business Analyst, Data Warehouse Developer
NRW.Bank
Business analysis for risk controlling.
Development of a data warehouse based on MS SQL Server with data from the FIS Cross-Asset Trading and Risk Platform (formerly Front Arena).
Implementation of ETL and transformation logic with T-SQL and Python (template engine Jinja2).
Modeling and automation of data structures with Data Vault.
Building reporting and analysis reports with Microsoft Power BI, including training and onboarding of users.
MS Power BI Developer, Data Warehouse Developer
Liebherr-Aerospace Lindenberg GmbH
Migration of existing QlikSense reports to Microsoft Power BI.
New development of reports in Power BI following reporting guidelines.
Further development of a data warehouse based on MS SQL Server with SSIS, SSAS and T-SQL.
Visualization and analysis of production and machine data as well as data from the ERP system.
Use of Analysis Services Tabular Model (SSAS), DAX and MS Power BI for self-service BI.
MS Power BI Developer, Oracle Developer
HDI / Talanx AG
Migration of IBM Cognos Report Studio reports to Microsoft Power BI with Oracle DB as the data source.
Development of analyses and data queries with Oracle SQL and PL/SQL.
Analysis and preparation of data from various business processes for reporting and management decisions.
Part-time assignment (approx. 25–50%).
Self-employed
Comelio Swiss GmbH
Independent work with a focus on BI/DWH development, data analysis, business analysis and data engineering.
Delivery of customer projects in Switzerland, Germany and internationally with a focus on MS SQL Server, Oracle, Snowflake, Azure, Power BI as well as statistical analyses with R and Python.
MS Power BI Developer, Data Warehouse Developer
SoftwareOne AG
Replacement of existing MS SQL Server Analysis Services OLAP cubes and multidimensional SSRS solutions with an Azure-based solution using SSAS Tabular Model and Microsoft Power BI.
Development and optimization of SQL Server databases as well as data integration with Azure Data Factory and Power Query / M.
Analysis and visualization of data from Microsoft Dynamics CRM in Power BI.
Automation of processes and workflows with Microsoft Power Automate.
Support with the migration from SSAS and MS SQL Server to Databricks.
Close, continuous collaboration with distributed teams in India.
First worked full-time, later part-time (approx. 50%).
XML Consultant
Cornelsen Verlag GmbH
Consulting and development as part of a digitalization project for schoolbooks.
Building an XML single source publishing workflow with DITA, oXygen, XSLT, and Schematron.
Providing technical consulting, quality assurance, and modeling with BPMN and UML.
Part-time assignment (about 25%).
Data Warehouse Developer
E.ON Energie GmbH
Further development and modeling of a data warehouse solution based on Snowflake and SnowSQL.
Data integration for contract, customer, and market data with Python and XSLT.
Building and maintaining reporting and analysis processes with Microsoft Power BI.
Initially full-time, then part-time (about 50%).
Web Developer
Comelio GmbH
Development of PHP-based websites connected to a PostgreSQL database.
Implementation of XML integration and XSLT transformations for content and interfaces.
Use of Bootstrap for responsive frontend design.
Delivery as part of a project at the Berlin site.
Data Integration Specialist, Team Lead
Siemens Gas and Power GmbH & Co. KG
Consulting and development for a document management and XML single source publishing approach.
XML data integration and transformation with Altova MapForce, XSLT, and Python between different applications in the context of power plant planning and construction.
Technical responsibility for interface design and data flows.
Part-time assignment (about 25%).
Data Warehousing Specialist
Bundesrechenzentrum GmbH und Arbeitsmarktservice
Modeling and development of a data warehouse for labor market data based on Oracle and MS SQL Server.
Use of Data Vault modeling to map complex historical data structures.
Automation of loading processes and metadata management with WhereScape Red and WhereScape 3D.
Implementation of T-SQL, PL/SQL, and MDX queries as well as OLAP cubes with SQL Server Analysis Services (SSAS).
Business Intelligence Specialist
PlanetHome AG
Modeling, designing, and developing a self-service BI platform based on MS SQL Server 2017, Azure Data Lake, Azure Data Factory, and Microsoft Power BI.
Development of an Analysis Services Tabular Model (SSAS) and DAX models for reports and self-service analyses.
Use of R and Shiny to visualize and forecast marketing and market data in the real estate sector.
Replacing existing T-SQL and MDX calculations in SSAS with DAX-based models.
Carrying out analyses for marketing, sales, and market data in a hybrid Azure and on-premises setup.
Part-time role.
Data Integration Specialist
Loyalty Partner GmbH (Payback)
Development and programming of configurable data integration solutions with MS SQL Server Integration Services (SSIS) and T-SQL.
Building ETL processes for Microsoft Dynamics NAV (Navision) based on MS SQL Server 2014.
Implementing data integration for billing with Payback partner companies and the company-wide data warehouse.
Part-time role (about 50%).
Data Warehousing Specialist
HSH Nordbank AG
Data Vault modeling and building a central data platform for customer, business, risk, and payment data based on Oracle.
Creating interfaces with Talend as well as additional Java and PL/SQL Apex programming for various banking systems.
Developing an Enterprise Data Warehouse with SQL, PL/SQL, Java, and Xtext for automatic generation of Data Vault structures.
Analyzing and improving data throughput and query performance.
Carrying out ETL development and data integration to provide mandatory legal and regulatory reports.
Business Intelligence Specialist, Data Warehousing Specialist
Toolport GmbH
Modeling and building a data warehouse for e-commerce and marketing analyses.
Design, consulting, and implementation with MS SQL Server including Data Vault modeling.
Development of OLAP cubes with SQL Server Analysis Services (SSAS) as well as reports with Reporting Services (SSRS) and Microsoft Power BI.
Implementing ETL processes and ensuring data quality with Integration Services (SSIS).
Using R and Shiny for forecasts and segmentations (time series analysis, regression, cluster analysis).
Project management with SCRUM and Jira.
Data Science Specialist
Atradius Credit Insurance N.V.
Building an analysis system for market and balance sheet data collected worldwide for credit insurance.
Data integration and interface definition between different source systems as well as consulting on data quality.
Use of MS SQL Server (T-SQL, SSIS, SSAS) and Oracle (PL/SQL) for OLAP and data mining.
Development of statistical models to calculate probability of default with Naive Bayes, Bayes networks, artificial neural networks, and logistic regression.
Programming and visualizing the models with R and R/Shiny.
Use of XSLT, XML Schema, Altova MapForce, and Integration Services for data integration, data quality checks, and transformation.
Team Lead, Reporting Specialist
Österreichische Beamtenversicherung (ÖBV)
Automated the generation of more than 500 PDF documents and reports from a data warehouse with customer and claims data.
Built XML interfaces and reporting solutions with Oracle DB, PL/SQL, XSLT, XML Schema, and Altova StyleVision.
Used Oracle Apex for reporting and UI development.
Led projects including technology consulting, data modeling, and coaching.
Managed projects using SCRUM with Jira; responsible as (sub-)project lead.
Team Lead, Business Intelligence Specialist
EFG Bank AG
Designed and developed a multilingual intranet reporting system for structured financial products.
Performed multidimensional time series analyses and forecasts of market data and customer demand.
Technical project lead for software development and statistical modeling.
Used Oracle DB, PL/SQL, Oracle OLAP, and Oracle Data Mining as well as R and Java.
Took on a sub-project lead role in the BI/analytics environment.
Data Science Specialist, Team Lead
Bundesministerium für Wirtschaft und Innovation / Hochschule für Philosophie München / Comelio GmbH
Designed and developed an ontology-based survey system for multidimensional and interactive questionnaires.
Integrated standard analyses (descriptive statistics, tests, correlations) and multivariate methods (regression, multidimensional scaling, clustering).
Overall project lead across companies with responsibility for architecture, development, and data analysis.
Used MS SQL Server, .NET, OWL, XSLT, and XSL-FO as well as Oracle, PL/SQL, Java, R, and data mining.
Defined XML Schema and Schematron rules to validate questionnaire and response data.
Reporting Specialist, Team Lead
Logit Management Consulting GmbH
Developed a multilingual analysis system for employee surveys with up to 400 million data records per survey.
Implemented dynamic report generation and team-based analysis with up to 10,000 individual reports in Microsoft PowerPoint.
Integrated statistical methods such as correlation, cluster analysis, discriminant analysis, logistic regression, and other regression techniques.
Technical project lead for software and database development, data analysis, and ensuring data quality and data integrity.
Used MS SQL Server (SSIS, SSRS, SSAS), .NET, VBA, and XML Schema.
Data Science Specialist, Team Lead
Gesellschaft für Konsumforschung (GfK) GmbH / Coca Cola AG
Designed and implemented an interactive analysis system with complex calculations for product placement in retail.
Developed a mobile questionnaire for about 600 users to capture product placements in retail.
Technical project lead for software and database development, data analysis, and ensuring data quality.
Used MS SQL Server (SSIS, SSRS, SSAS), MS Access, VBA, and .NET.
Used data warehousing techniques and T-SQL to map the analysis and reporting logic.
Business Intelligence Specialist, Team Lead
AOK AG / AOK Baden-Württemberg
Built a data warehouse for insurance benefits, including modules for online reporting, forecasting, and fraud detection.
Responsible for data integration, data quality, and data consistency.
Technical project leadership and coaching for software and database development as well as statistical data analysis.
Used MS SQL Server (SSIS, SSRS, SSAS) and .NET.
Used MDX, DMX, and T-SQL for complex analyses and forecasting models.
Self-employed
Comelio Business Solutions Pvt. Ltd
Self-employed work with a focus on offshore/nearshore development in the areas of databases, BI, and XML.
Managed and carried out projects with a development team in Chennai.
Self-employed
Comelio, Inc.
Self-employed work with a focus on BI, DWH, and software projects for international clients.
Carried out consulting and development projects in the database and reporting field at the Miami location.
Business Intelligence Specialist, Team Lead
Santander Consumer Bank AG
Built and further developed BI and reporting solutions for banking and loan products.
Used Oracle DB, Oracle OLAP, and PL/SQL for data warehousing, OLAP analyses, and reporting.
Responsible as team lead for design, implementation, and optimization of the BI architecture.
Business Intelligence Specialist, Data Integration Specialist, Team Lead
Deutscher Bundesrat
Built a data warehouse with interactive reporting and complex data integration for financial budget data from the federal states.
Carried out time series analyses and forecasts for budget and financial key figures.
Project leadership with responsibility for database and software development as well as data analysis and data quality assurance.
Used MS SQL Server (SSIS, SSRS, SSAS), T-SQL, .NET, VBA, XML, and OWL.
Developed complex reports and OLAP cubes as well as integration processes for heterogeneous data sources.
Data Science Specialist, Team Lead
T-Systems GmbH
Development of an OLAP and analytics system for HR and health data.
Conducted various multivariate analyses (e.g. regression and classification methods) in the health and HR context.
Technical project management with responsibility for database and software development as well as statistical analyses.
Use of Oracle DB, Oracle OLAP, PL/SQL, Java and R.
Data Science Specialist, Team Lead
Teles AG
Development of an ontology-based expert system for competitive monitoring in the technology sector based on patents and inventive step.
Design and implementation of an ontology-based expert system based on Oracle DB, Java, PHP, XML and OWL.
Use of XSLT and XSL-FO for presentation and document processing.
Technical project management with responsibility for data modeling, software and database development.
Conducted data and text analyses to assess technological developments.
Data Science Specialist, Team Lead
SchürmannSpannel AG
Development of an expert system for the analysis and assessment of factory buildings, including usage simulation and an interactive evaluation/questionnaire.
Use of MS SQL Server, .NET, XML and OWL for data storage, logic and knowledge representation.
Project management with responsibility for database and software development as well as data analysis.
Winning project in the "Zukunftswettbewerb Ruhrgebiet" competition.
Use of C#, T-SQL, XSLT and XML Schema to implement the expert system.
Reporting Specialist
Maporama SA
Development of an analytics system for comparing usage profiles in map search.
Implementation of reports and analyses with Oracle DB and Oracle Reports.
Programming with Java and PL/SQL to implement business logic and map functions.
Self-employed
Comelio GmbH
Self-employed work focused on BI, data warehousing, data analysis and software development.
Built and led projects for databases, reporting, XML integration and statistical analyses in Essen and Berlin.
Industry Experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Professional Services, Banking and Finance, Government and Administration, Insurance, and Retail.
Business Area Experience
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Experienced in Business Intelligence, Information Technology, Project Management, Finance, Product Development, and Research and Development.
Summary
I bring extensive experience in developing and optimizing data warehouses, BI solutions and reporting systems across multiple industries. My work has helped organizations streamline data integration and insight generation using MS SQL Server, Oracle, Azure and Power BI.
By leveraging ETL, Data Vault modeling, and robust analytical techniques, I ensure reliable data infrastructures and valuable business insights. My hands-on experience with Python, R and various BI tools allows me to transform complex data into actionable information easily.
Consultant, developer, and trainer in the fields of: Business Intelligence / Analytics using Microsoft Fabric / Azure, Power BI, Data Science using R and Python, Data Warehousing using Azure SQL, SQL Server, Oracle. Specialist in XML technologies: XML Schema, XSLT & XSL-FO plus Altova software.
Skills
Databases:
- Ms Sql Server
- Oracle
- Snowflake
Methods:
- 3nf
- Data Vault
- Star Schema
Data Integration:
- Azure Data Factory
- Integration Services (Ssis)
- Altova Mapforce
Reporting:
- Ms Azure Analysis Services
- Ms Azure Synapse
- Ms Power Bi
- Shiny/R
- Altova Stylevision
Data Analysis:
- R
- Python
- Minitab
- Ibm Spss Statistics
Software:
- T-Sql
- Pl/Sql
- Python
- R
Modeling:
- Uml
- Bpmn
Xml:
- Xml Schema
- Xslt
- Xsl-Fo
- Altova Missionkit (Xmlspy, Stylevision, Mapforce)
Software Development And Tools:
- Git
- Jira
- Octane
- Confluence
- Sparx Enterprise Architect
Data Analysis Methods:
- General Linear Model (E.G. Regression Analysis, (M)An(C)Ova, Logistic Regression)
- Multivariate Methods (E.G. Cluster Analysis, Discriminant Analysis, Factor Analysis, Structural Equation Modeling, Conjoint Analysis, Multidimensional Scaling, Time Series Analysis)
- Data Mining (E.G. Decision Trees, Artificial Neural Networks, (Sequence) Cluster Analysis And Association Analysis)
- Engineering Statistics (E.G. Design Of Experiments And Evaluation, Statistical Process And Quality Control)
Software:
- Analysis, Visualization And Programming With R
- Ibm Spss Statistics
- Jmp
- Minitab
Databases:
- Ms Sql Server
- T-Sql
- Data Warehousing With Integration / Reporting / Analysis Services
- Oracle
- Sql And Pl/Sql
- Olap And Data Warehousing
- Data Mining
Languages
Education
Université de Sorbonne I
Licence · Management · Paris, France
Bergische Universität Wuppertal
Diploma · Economics with a focus on business informatics · Wuppertal, Germany · 2.0
Certifications & licenses
Microsoft Certified: AI Business Professional
Microsoft
Microsoft Certified: AI Transformation Leader
Microsoft
Professional Scrum Master II (PSM II)
SCRUM.ORG
Professional Scrum Master I (PSM I)
Scrum Org
Microsoft Certified: SQL AI Developer Associate
Microsoft
Microsoft Certified: Azure Database Administrator Associate
Microsoft
Microsoft Certified: Azure Data Scientist Associate
Microsoft
Microsoft Certified: Fabric Data Engineer Associate
Microsoft
Microsoft Certified: Fabric Analytics Engineer Associate
Microsoft
Microsoft Certified: Azure AI Fundamentals
Microsoft
Microsoft Certified: Power BI Data Analyst Associate
Microsoft
Microsoft Certified: Azure Data Fundamentals
Microsoft
CompTIA CTT+ Classroom Trainer Certification
CompTIA
Oracle PL/SQL Developer Certified Associate
Oracle
Statistics
Experience
Global Experience
Expertise
Qualifications
Profile
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