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 (Jinja2 template engine).
Modeling and automation of data structures using Data Vault.
Building reporting and analysis reports with Microsoft Power BI including user training and onboarding.
MS Power BI Developer, Data Warehouse Developer
Liebherr-Aerospace Lindenberg GmbH
Migration of existing QlikSense reports to Microsoft Power BI.
Development of new reports in Power BI in line with reporting guidelines.
Further development of a data warehouse based on MS SQL Server using 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 using Oracle DB as the data source.
Development of analyses and data queries using Oracle SQL and PL/SQL.
Analysis and preparation of data from various business processes for reporting and management decisions.
Part-time engagement (approx. 25–50%).
Self-employed
Comelio Swiss GmbH
Self-employed work focusing on BI/DWH development, data analysis, business analysis, and data engineering.
Carrying out client projects in Switzerland, Germany, and internationally, focusing on MS SQL Server, Oracle, Snowflake, Azure, Power BI, and statistical analyses with R and Python.
MS Power BI Developer, Data Warehouse Developer
SoftwareOne AG
Replacing 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 using Microsoft Power Automate.
Support for migration from SSAS and MS SQL Server to Databricks.
Close, continuous collaboration with distributed teams in India.
Initially full-time, later part-time engagement (approx. 50%).
XML Consultant
Cornelsen Verlag GmbH
Consulting and development as part of a digitization project for schoolbooks.
Set up an XML single-source publishing workflow using DITA, oXygen, XSLT, and Schematron.
Provided technical consulting, quality assurance, and modeling using BPMN and UML.
Part-time role (approx. 25%).
Data Warehouse Developer
E.ON Energie GmbH
Enhanced and modeled a data warehouse solution based on Snowflake and SnowSQL.
Integrated contract, customer, and market data using Python and XSLT.
Set up and maintained reporting and analysis processes with Microsoft Power BI.
Worked full-time initially, then part-time (approx. 50%).
Web Developer
Comelio GmbH
Developed PHP-based websites connected to a PostgreSQL database.
Implemented XML integration and XSLT transformations for content and interfaces.
Used Bootstrap for responsive front-end design.
Implemented as part of a project at the Berlin location.
Data Integration Specialist, Team Lead
Siemens Gas and Power GmbH & Co. KG
Provided consulting and development for a document management and XML single-source publishing approach.
Handled XML data integration and transformation with Altova MapForce, XSLT, and Python between various applications in power plant planning and construction.
Technically responsible for interface design and data flows.
Part-time role (approx. 25%).
Data Warehousing Specialist
Bundesrechenzentrum GmbH und Arbeitsmarktservice
Modeled and developed a data warehouse for labor market data based on Oracle and MS SQL Server.
Used Data Vault modeling to map complex historical data structures.
Automated loading processes and metadata management with WhereScape Red and WhereScape 3D.
Implemented 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 analysis.
Use of R and Shiny for visualizing and forecasting marketing and market data in the real estate sector.
Replacing existing T-SQL and MDX calculations in SSAS with DAX-based models.
Performing analyses for marketing, sales and market data in a hybrid Azure and on-premises setup.
Part-time assignment.
Data Integration Specialist
Loyalty Partner GmbH (Payback)
Developing and coding configurable data integration solutions with MS SQL Server Integration Services (SSIS) and T-SQL.
Building ETL pipelines for Microsoft Dynamics NAV (Navision) using MS SQL Server 2014.
Implementing data integration for billing with Payback partner companies and the enterprise data warehouse.
Part-time assignment (about 50%).
Data Warehousing Specialist
HSH Nordbank AG
Data Vault modeling and building a central data platform for customer, business, risk and payment data on Oracle.
Creating interfaces with Talend and additional Java and PL/SQL Apex programming to connect to various banking systems.
Developing an enterprise data warehouse with SQL, PL/SQL, Java and Xtext for automatic generation of Data Vault structures.
Analyzing and optimizing data throughput and query performance.
Performing ETL development and data integration to deliver mandatory and regulatory reports.
Business Intelligence Specialist, Data Warehousing Specialist
Toolport GmbH
Modeling and building a data warehouse for e-commerce and marketing analytics.
Designing, advising and implementing solutions with MS SQL Server, including Data Vault modeling.
Developing OLAP cubes with SQL Server Analysis Services (SSAS) and 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 segmentation (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 globally collected market and balance sheet data for credit insurance.
Data integration and interface definition between various source systems, as well as advising on data quality.
Using MS SQL Server (T-SQL, SSIS, SSAS) and Oracle (PL/SQL) for OLAP and data mining.
Developing statistical models to calculate credit default probabilities with Naive Bayes, Bayesian networks, artificial neural networks and logistic regression.
Programming and visualizing the models with R and R/Shiny.
Using XSLT, XML Schema, Altova MapForce and Integration Services for data integration, data quality checks and transformation.
Team Lead, Reporting Specialist
Österreichische Beamtenversicherung (ÖBV)
Automated generation of over 500 PDF documents and reports from a data warehouse containing customer and service data.
Developed XML interfaces and reporting solutions using 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; acted as (sub-)project lead.
Team Lead, Business Intelligence Specialist
EFG Bank AG
Designed and developed a multilingual intranet reporting system for structured financial products.
Conducted multidimensional time series analysis and forecasts of market data and customer demand.
Led technical projects 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 sub-project leadership in the BI/analytics area.
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).
Led a cross-company project 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 evaluation system for employee surveys with up to 400 million 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.
Provided technical project management for software and database development, data analysis, and ensured data quality and 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 evaluation system with complex calculations for product placement in retail.
Developed a mobile questionnaire for about 600 users to capture product placements in retail.
Led technical projects for software and database development, data analysis, and ensured data quality.
Used MS SQL Server (SSIS, SSRS, SSAS), MS Access, VBA, and .NET.
Employed data warehousing techniques and T-SQL to implement evaluation and reporting logic.
Business Intelligence Specialist, Team Lead
AOK AG / AOK Baden-Württemberg
Building a data warehouse for insurance services with modules for online reporting, forecasting and fraud detection.
Responsibility for data integration, data quality and consistency.
Technical project leadership and coaching for software and database development as well as statistical data analysis.
Use of MS SQL Server (SSIS, SSRS, SSAS) and .NET.
Use of MDX, DMX and T-SQL for complex analyses and forecasting models.
Self-employment
Comelio Business Solutions Pvt. Ltd
Self-employment focusing on offshore/nearshore development in databases, BI and XML.
Management and execution of projects with a development team in Chennai.
Self-employment
Comelio, Inc.
Self-employment focusing on BI, DWH and software projects for international clients.
Execution of consulting and development projects in database and reporting environments at the Miami location.
Business Intelligence Specialist, Team Lead
Santander Consumer Bank AG
Building and improving BI and reporting solutions for banking and credit products.
Use of Oracle DB, Oracle OLAP and PL/SQL for data warehousing, OLAP analysis and reporting.
Responsibility as team lead for conception, implementation and optimization of the BI architecture.
Business Intelligence Specialist, Data Integration Specialist, Team Lead
Deutscher Bundesrat
Building a data warehouse with interactive reporting and complex data integration for state budget financial data.
Conducting time series analyses and forecasting for budget and financial metrics.
Project leadership with responsibility for database and software development, data analysis and ensuring data quality.
Use of MS SQL Server (SSIS, SSRS, SSAS), T-SQL, .NET, VBA, XML and OWL.
Development of 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 analysis system for personnel and health data.
Conducting 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 intelligence in the technology sector based on patents and level of innovation.
Design and implementation of an ontology-based expert system using Oracle DB, Java, PHP, XML, and OWL.
Use of XSLT and XSL-FO for presentation and document preparation.
Technical project management with responsibility for data modeling, software, and database development.
Conducting data and text analyses to evaluate technological developments.
Data Science Specialist, Team Lead
SchürmannSpannel AG
Development of an expert system for analysis and evaluation of factory buildings, including usage simulation and an interactive assessment 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.
Award-winning project in the Future Competition Ruhr Area.
Use of C#, T-SQL, XSLT, and XML Schema for implementing the expert system.
Reporting Specialist
Maporama SA
Development of an analysis system for comparing usage profiles in map search.
Implementation of reports and analyses using Oracle DB and Oracle Reports.
Programming in 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.
Establishing and leading projects for databases, reporting, XML integration, and statistical analyses at locations 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 Models (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 Control 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
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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