Recommended expert

Marco Skulschus

Business Analyst, Data Warehouse Developer

Marco Skulschus
Zug, Switzerland

Experience

Jan 2024 - Jun 2025
1 year 6 months
Düsseldorf, Germany

Business Analyst, Data Warehouse Developer

NRW.Bank

  • Business analysis for risk controlling.

  • Development of a data warehouse based on MS SQL Server using data from the FIS Cross-Asset Trading and Risk Platform (formerly Front Arena).

  • Implementation of ETL and transformation logic using T-SQL and Python (Jinja2 template engine).

  • Modeling and automation of data structures with Data Vault.

  • Building reporting and analytical reports with Microsoft Power BI, including training and onboarding users.

Aug 2023 - Aug 2024
1 year 1 month
Lindenberg im Allgäu, Germany

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 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.

Jun 2022 - Dec 2023
1 year 7 months
Hanover, Germany

MS Power BI Developer, Oracle Developer

HDI / Talanx AG

  • Migration of IBM Cognos Report Studio reports to Microsoft Power BI with Oracle DB as 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%).

Jan 2022 - Present
4 years 1 month
Zug, Switzerland

Self-employment

Comelio Swiss GmbH

  • Self-employment focusing on BI/DWH development, data analysis, business analysis and data engineering.

  • Execution of client projects in Switzerland, Germany and internationally, focusing on MS SQL Server, Oracle, Snowflake, Azure, Power BI as well as statistical analyses with R and Python.

Jun 2021 - Dec 2023
2 years 7 months
Stans, Switzerland

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 in the 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%).

Jul 2020 - Oct 2020
4 months
Berlin, Germany

XML Consultant

Cornelsen Verlag GmbH

  • Consulting and development as part of a digitalization project for textbooks.

  • Setting up 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 role (approx. 25%).

May 2020 - May 2021
1 year 1 month
Munich, Germany

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 using Python and XSLT.

  • Setting up and maintaining reporting and analytics processes with Microsoft Power BI.

  • Initially full-time, then part-time (approx. 50%).

May 2020 - Aug 2020
4 months
Berlin, Germany

Web Developer

Comelio GmbH

  • Developing PHP-based websites connected to a PostgreSQL database.

  • Implementing XML integration and XSLT transformations for content and interfaces.

  • Using Bootstrap for responsive frontend design.

  • Part of a project based in Berlin.

Apr 2020 - Jul 2020
4 months
Berlin, Germany

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 using Altova MapForce, XSLT, and Python between different applications in the power plant planning and construction environment.

  • Technical responsibility for interface design and data flows.

  • Part-time role (about 25%).

Jun 2019 - May 2020
1 year
Vienna, Austria

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.

  • Using Data Vault modeling to map complex historical data structures.

  • Automating loading processes and metadata management with WhereScape Red and WhereScape 3D.

  • Implementing T-SQL, PL/SQL, and MDX queries as well as OLAP cubes with SQL Server Analysis Services (SSAS).

Apr 2018 - Mar 2020
2 years
Munich, Germany

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.

  • Developing an Analysis Services Tabular Model (SSAS) and DAX models for reporting and self-service analysis.

  • Using R and Shiny for visualizing and forecasting marketing and market data in real estate.

  • 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 role.

Apr 2018 - May 2019
1 year 2 months
Munich, Germany

Data Integration Specialist

Loyalty Partner GmbH (Payback)

  • Developing and programming 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 enterprise data warehouse.

  • Part-time role (approx. 50%).

May 2016 - Apr 2018
2 years
Kiel, Germany

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 plus 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 optimizing data throughput and query performance.

  • Performing ETL development and data integration to provide statutory and regulatory reports.

Jan 2016 - Apr 2016
4 months
Hamburg, Germany

Business Intelligence Specialist, Data Warehousing Specialist

Toolport GmbH

  • Modeling and building a data warehouse for e-commerce and marketing analysis.

  • Designing, advising, and implementing 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 forecasting and segmentation (time series analysis, regression, cluster analysis).

  • Project management with SCRUM and Jira.

Jan 2015 - Dec 2015
1 year
Paris, France

Data Science Specialist

Atradius Credit Insurance N.V.

  • Building an analysis system for globally collected market and financial statement data for credit insurance.

  • Integrating data and defining interfaces between various source systems and 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 default probabilities with Naive Bayes, Bayesian networks, artificial neural networks, and logistic regression.

  • Programming and visualizing the models with R and Shiny.

  • Using XSLT, XML Schema, Altova MapForce, and Integration Services for data integration, data quality checks, and transformation.

Mar 2014 - Feb 2016
2 years
Vienna, Austria

Team Lead, Reporting Specialist

Österreichische Beamtenversicherung (ÖBV)

  • Automated generation of more than 500 PDF documents and reports from a data warehouse with customer and service data.

  • Creation of XML interfaces and reporting solutions using Oracle DB, PL/SQL, XSLT, XML Schema, and Altova StyleVision.

  • Use of Oracle APEX for reporting and interface development.

  • Project leadership including technology consulting, data modeling, and coaching.

  • Project management following SCRUM with Jira; responsibility as (sub)project manager.

Jan 2013 - Dec 2014
2 years
Geneva, Switzerland

Team Lead, Business Intelligence Specialist

EFG Bank AG

  • Design and development of a multilingual intranet reporting system for structured financial products.

  • Execution of multidimensional time series analyses and forecasts of market data and customer demand.

  • Technical project leadership for software development and statistical modeling.

  • Use of Oracle DB, PL/SQL, Oracle OLAP and Oracle Data Mining as well as R and Java.

  • Taking on a subproject lead role in the BI/Analytics environment.

Jan 2012 - Dec 2013
2 years
Berlin, Germany

Data Science Specialist, Team Lead

Bundesministerium für Wirtschaft und Innovation / Hochschule für Philosophie München / Comelio GmbH

  • Design and development of an ontology-based survey system for multidimensional and interactive questionnaires.

  • Integration of standard analyses (descriptive statistics, tests, correlations) and multivariate methods (regression, multidimensional scaling, clustering).

  • Cross-company overall project management with responsibility for architecture, development, and data analysis.

  • Use of MS SQL Server, .NET, OWL, XSLT and XSL-FO as well as Oracle, PL/SQL, Java, R, and data mining.

  • Definition of XML Schema and Schematron rules to validate questionnaire and response data.

Jan 2012 - Dec 2012
1 year
Munich, Germany

Reporting Specialist, Team Lead

Logit Management Consulting GmbH

  • Development of a multilingual evaluation system for employee surveys with up to 400 million records per survey.

  • Implementation of dynamic report generation and team-based analysis with up to 10,000 individual reports in Microsoft PowerPoint.

  • Integration of statistical methods such as correlation, cluster analysis, discriminant analysis, logistic regression, and other regression techniques.

  • Technical project leadership for software and database development, data analysis, and ensuring data quality and integrity.

  • Use of MS SQL Server (SSIS, SSRS, SSAS), .NET, VBA, and XML Schema.

Jan 2011 - Dec 2012
2 years
Berlin, Germany

Data Science Specialist, Team Lead

Gesellschaft für Konsumforschung (GfK) GmbH / Coca Cola AG

  • Design and implementation of an interactive evaluation system with complex calculations for product placement in retail.

  • Development of a mobile questionnaire for around 600 users to capture product placements in retail.

  • Technical project leadership for software and database development, data analysis, and ensuring data quality.

  • Use of MS SQL Server (SSIS, SSRS, SSAS), MS Access, VBA, and .NET.

  • Use of data warehousing techniques and T-SQL to represent evaluation and reporting logic.

Jan 2011 - Dec 2011
1 year
Stuttgart, Germany

Business Intelligence Specialist, Team Lead

AOK AG / AOK Baden-Württemberg

  • Built a data warehouse for insurance services including modules for online reporting, forecasting and fraud detection.

  • Responsible for data integration, data quality and consistency.

  • Led technical project management and coaching for software and database development as well as statistical data analysis.

  • Utilized MS SQL Server (SSIS, SSRS, SSAS) and .NET.

  • Employed MDX, DMX and T-SQL for complex analyses and forecasting models.

Jan 2010 - Dec 2015
6 years
Chennai, India

Self-employed

Comelio Business Solutions Pvt. Ltd

  • Worked independently focusing on offshore/nearshore development in databases, BI and XML.

  • Directed and executed projects with a development team in Chennai.

Jan 2010 - Dec 2013
4 years
Miami, United States

Self-employed

Comelio, Inc.

  • Worked independently focusing on BI, DWH and software projects for international clients.

  • Conducted consulting and development projects in the database and reporting environment on-site in Miami.

Jan 2010 - Dec 2011
2 years

Business Intelligence Specialist, Team Lead

Santander Consumer Bank AG

  • Built and enhanced BI and reporting solutions for banking and credit products.

  • Utilized Oracle DB, Oracle OLAP and PL/SQL for data warehousing, OLAP analyses and reporting.

  • Served as team lead responsible for designing, implementing and optimizing the BI architecture.

Jan 2008 - Dec 2009
2 years
Berlin, Germany

Business Intelligence Specialist, Data Integration Specialist, Team Lead

Deutscher Bundesrat

  • Built a data warehouse with interactive reporting and complex data integration for federal states' financial budget data.

  • Performed time series analyses and forecasts on budget and financial metrics.

  • Led projects with responsibility for database and software development, data analysis and ensuring data quality.

  • Utilized 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.

Jan 2008 - Dec 2008
1 year
Berlin, Germany

Data Science Specialist, Team Lead

T-Systems GmbH

  • Development of an OLAP and analysis system for personnel and health data.

  • Performing 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.

Jan 2007 - Dec 2007
1 year
Berlin, Germany

Data Science Specialist, Team Lead

Teles AG

  • Development of an ontology-based expert system for competitor monitoring in technology areas 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 formatting.

  • Technical project management with responsibility for data modeling, software, and database development.

  • Performing data and text analyses to assess technological developments.

Jan 2006 - Dec 2006
1 year
Bochum, Germany

Data Science Specialist, Team Lead

SchürmannSpannel AG

  • Development of an expert system for the 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 Ruhr Area Future Competition.

  • Use of C#, T-SQL, XSLT, and XML Schema for implementing the expert system.

Jan 2005 - Dec 2005
1 year
Paris, France

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 with Java and PL/SQL to implement business logic and map functions.

Jan 2000 - Dec 2022
23 years
Berlin, Germany

Self-employment

Comelio GmbH

  • Self-employed work focusing on BI, data warehousing, data analysis, and software development.

  • Setting up and leading projects for databases, reporting, XML integration, and statistical analyses in Essen and Berlin.

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 Techniques (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 And Analysis Of Experiments, 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

German
Native
English
Advanced
French
Intermediate
Italian
Elementary

Education

Bergische Universität Wuppertal

Diploma · Economics with a focus on Business Informatics · Wuppertal, Germany

Université de Sorbonne I

Bachelor's degree · Paris, France

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