Eric Mertens

Technical Lead

Salary / Daily rate

Brussels, Belgium

Mobility: Brussels, Namur, ...

Freelance

Can come onsite

Skills

ETLPythonJavaOracle DatabaseMicrosoft SQL ServerPostgreSQLData EngineeringRESTful APIsRKnowledge ManagementMongoDBData VisualizationData MiningBig DataMySQLSQLiteBusiness DevelopmentSalesforceLinuxData AnalysisSQL databasesMachine LearningAIAWSOdooZoho CRM

Languages

EnglishFrench

About me

Intro

Senior Data Warehouse Architect with 20+ years of experience transforming complex data into actionable business insights. Expert in Qlik Sense, Business Objects, Oracle Data Integrator, and Data Vault methodologies, with notable achievements including a groundbreaking Groovy library that automated Data Vault job creation. Combining deep technical expertise with NLP coaching skills to deliver comprehensive BI solutions that enhance decision-making and operational efficiency across industries.

Links

Work experience

Technical Lead

VizeonFreelance

Feb 2025 - Present

1 year 9 months

Mont-Saint-Guibert, Belgium

Skills: Qlik Sense · Qlik · Powershell · Data Warehouse Architecture · Data Vault

Qlik System Engineer

KBC Global ServicesFreelance

Sep 2023 - Present

3 years 2 months

Leuven, Belgium

Owner

Stragittus

Jan 2001 - Present

25 years 10 months

Mont-Saint-Guibert, Belgium

Owner, Datawarehouse Architect & Analyst, Business Objects Certified Universe Builder, Qlik Sense Senior Consultant Occasionally, NLP Coach & Trainer

DWH Analyst & Developer

GalapagosFreelance

May 2022 - Jul 2023

1 year 3 months

Mechelen, Belgium

* Project - Transparency Reporting * Description - Develop a new Data Mart + Qlik Sense App for the regulatory reporting and internal dashboard to replace manual process * Tasks - Sources Analysis (4 different file structures + reference data) - Data Modeling / Star Modeling - SQL development (DDL/DML/DCL) - Qlik Development - Documentation - Maintenance & Follow-Up * Project - Drug Development * Description - Maintain & expand existing Data Mart * Tasks - Adapt the current Data Mart based on new business requirements - SQL development (DDL/DML/DCL) - Documentation * Project - PostgreSQL/RDS Monitoring App * Description - Develop a new Qlik Sense App on PostgreSQL/RDS objects (Tables, Columns, Indexes, Comparison between DEV/ACC/PRD, Statistics, …)

WeQanFreelance

Aug 2018 - May 2022

3 years 10 months

Hybrid

Senior Qlik Consultant / Head of Knowledge Management at WeQan

Jun 2021 - May 2022

1 year

Hybrid

* Main Tasks - Manage Knowledge Management @ WeQan (Knowledge sharing / Aprèm-Tec / Best Practices / Templates of apps & scripts) - Coaching of junior consultants

Senior Qlik Consultant @ WeQan

Aug 2018 - Dec 2021

3 years 5 months

Hybrid

* Training, Coaching & Consulting for WeQan Customers - Develop Qlik Apps using connections to SQL Server, Postgres, MySql, Csv, Xlsx, Ms Lists, REST, MongoDB, .. - Develop Powershell modules using Qlik-Cli to release applications to DEV/TST/ACC/PRD - Develop Powershell modules using Qlik-Cli to deploy multi-tenant apps ( 700 Apps + Streams + Data connections + reload tasks) - Develop ODAG app - Implement Security Rules using QS Custom Properties - Give QS trainings to customers (Developer/Designer/Server Admin)

Founder

BI-Box SolutionsFreelance

Sep 2014 - Dec 2021

7 years 4 months

Mont-Saint-Guibert, Belgium

* Project - BI-Box Fiduciaires * Description - Design and develop a new reporting solution on an accounting software (WinBooks) using Data-Vault modeling and Star modeling. * Functional Analysis - Mind Map - UML Actor & Use Case Diagram for the As-Is and To-Be Situation - Data Vault and Star Model Design - Data Flow & Process Flow Design * Technical Analysis - Source to target column mapping - Detailed analysis of ETL process * Development & Testing - Implementation of the target Data Vault model and Star-Model (tables, indexes, sequences, ....) on Ms SQL Server 2014 & PostgreSQL - Development of ETL jobs with ODI, Python, Pentaho Data Integration / Kettle * Business Development - Sales & Marketing to promote the solution

Lead Analyst for European Commission – EuropAid – DG DEVCO

European CommissionFreelance

May 2016 - Jul 2017

1 year 3 months

Brussels, Brussels Region, Belgium · On-site

* Projects - EAMR - DQ Dashboard * Description - Manage analyst team of the DG DEVCO DWH Sector * Tasks - Reporting to Head of DWH Sector - Coaching & People management of analysts - Analysis of several key projects (DQ Dashboard, EAMR, …) * Technologies & Tools : - Oracle, Data-Vault, TOAD, SAP BODS, Sybase PowerDesigner

BI & DWH Consultant for Infrabel I-AM.217

InfrabelFreelance

Mar 2016 - Aug 2016

6 months

Brussels, Brussels Region, Belgium · On-site

* Project - Hosting of the BI-32 project by I-AM.217 department * Description - Migration of an existing ETL developed in ODI to Pentaho Data Integration (PDI / Kettle). * Tasks - Analysis - Infrastructure setup - Development - Tests - Release in Prod - Knowledge transfer * Technologies & Tools - Oracle, PostgreSQL, MySQL, Linux, Pentaho Data Integration/Kettle, Fly Speed Query, Data-Vault

BI & DWH Consultant for Institut Ressources PNL

Ressources Formation

Sep 2015 - Jan 2016

5 months

1380 Lasne, Belgium

* Project - Hermes * Description - Design and develop a new reporting solution based on Odoo data to target customers for email marketing * Tasks - Functional & technical analysis - Development & Testing - Release in prod * Technologies & Tools - Odoo, Python, RESTful API, Linux, ZoHo Reports

Senior BI & DWH Consultant For Infrabel

InfrabelFreelance

Jun 2012 - May 2014

2 years

Brussels Area, Belgium · On-site

* Projects : - InciMII - INES - DIS - ATHENA - A1058 - RIOC Calls - A1138 - TC460 Driver Forms - A1139 - Minute Responsible - A1140 - Referential Data - RDV - TrackPro - A175 - CostModel - Quick Win - SARA - Data For Reporting - ArtRob Lite * Main Tasks : - Functional Analysis - Data Modeling (Data-Vault & Star-Model) - Development using ODI - Release & Scheduling - Maintenance & Improvements - Knowledge Transfer * Personal Initiative : - Develop ODI procedures in Groovy + ODI SDK to automate the design and development of Data-Vault models and interfaces

BI & DWH Consultant for GFI

Telindus LuxembourgFreelance

Mar 2014 - May 2014

3 months

Luxemburg, Walloon Region, Belgium · On-site

* Project : - 5 days of support on SAP BI * Tasks : - Installation, administration, JDBC configuration * Technologies & Tools : - SAP BI, Linux, JDBC

Senior BI & DWH Consultant for Effigy

EffigyFreelance

Jan 2012 - Mar 2012

3 months

Liège Area, Belgium · On-site

* Project - BI Implementation @ Effigy * Description - Implementation of BI methodologies for Effigy (Kimball approach, …) - Prepare the MCTP BI 2008 Exam (SSIS/SSAS/SSRS) - Support & Coaching of BI team members - Pre-sales support for Sales Representative - Writing of Proposals for BI opportunities

Senior BI & DWH Consultant for BI-Community.org

BI-Community.orgFreelance

Sep 2011 - Dec 2011

4 months

Leuven · Hybrid

* Project - Setup of a BI Training Curriculum * Description - Collect BI Training & Trainers information - Collect standard BI Roles & Skills information - Design of an online application on Zoho to manage the Training, - Trainers, Roles & Skills information

BI Consultant for Sony - VOE

Sony VAIO of EuropeFreelance

Mar 2006 - Jul 2011

5 years 5 months

Zaventem · On-site

* Projects - VAIO-Link New Technology - Sony Style Store Contact Center DWH - Logistics - SQL 2000 DTS Migration to ODI - Garata - Clarify ODS - Magic Link - Sony VOE Global Data Warehouse Implementation - Business Suite - Sales Agent XP db - Garata ODS - FBI - Korogashi - Sales Revamp - TVOE Demand Planning - ERPC BO 6.5 to BOXIR3 Migration * Description - Solution Architecture - - Mind map - - UML Actor & Use Case Diagram for the As-Is and To-Be Situation - - Star Model design - - Data Flow & Process Flow - Detailed Design - - Source to target column mapping - - Detailed analysis of ETL process - - Detailed analysis of Business Objects universes - Development & Testing - - Implementation of the target star model (tables, views, indexes, ...) on SQL Server 2000 & SQL Server 2005 through SQL DDL scripts - - Development of ETL jobs with Oracle Data Integrator (ODI - formerly Sunopsis) by creating and maintaining several ODI projects - - Data Quality Assessment of the source database through specific ODI projects - - Eventually, development of specific LKMs, IKMs, CKMs, and RKMs - - Creation & Maintenance of BO Universes and Reports using BO 6.5/BOXIR2/BOXIR3 - Release in production - - Release of the ODI scenarios through the ODI versioning system - - Release of the BO Universes by import/export from the development domain to the production domain - - Creation of the target star-model through SQL DDL scripts - - Scheduling of the ODI scenarios through startscen.bat ODI mechanism - Maintenance & Improvement of the Data Marts to follow business changes from March 2006 until June 2011 - Knowledge transfer

BI Consultant for CAAMI-HZIV

CAAMI - HZIV - HKIVFreelance

Jan 2006 - Mar 2006

3 months

Brussels, Brussels Region, Belgium · On-site

* Project - Dashboard * Description - Detailled analysis of ETL process, as well as Business Objects universes & reports - Development of those ETL jobs with the Business Objects Data Integrator Tool - Development of universes and reports with Business Objects 6.5 - Automation, production set-up, scheduling of ETL and reports - Implementation of WEBI to access reports and universes through a web interface - Training of key-users for the Business Objects Tools (Reporter, Designer, Data Integrator) and introduction to star-modeling - Knowledge transfert

Business Development Manager

Objectif-Etre

Jul 2005 - Dec 2005

6 months

Braine-l'Alleud, Belgium

* Project - Setup the training "Les Bases de la PNL" * Description - Analyse "As-Is State" and "To-Be State" of the potential attendees; - Identify concepts needed to move away from the "As-Is State" towards the "To-Be State"; - Create training material (handouts & slides); * Project - Setup the training "Gestion des conflits avec Le Petit Prince" * Description - Analyse "As-Is State" and "To-Be State" of the potential attendees; - Identify concepts needed to move away from the "As-Is State" towards the "To-Be State"; - Create training material (handouts & slides); * Project - Life Coaching for Individuals * Description - Coach individuals in analysing their current situation; - Coach individuals in defining their personnal goal; - Define actions to move away from the current situation towards individual personnal goal; - Train, support and coach individual in executing those actions.

Datawarehouse Technical Head Of Project

MobistarFreelance

Sep 2004 - Jul 2005

11 months

Brussels, Brussels Region, Belgium · On-site

* Project - Functionnal Analysis for the Leonardo project (Customer DataMart v2) * Description - Analyse business requirements written by end-users; - Identify scope of the solution by using UML; - Create dimensionnal model and databus based on reports requirements; - Design database star-model using Oracle Designer; - Identify source table to populate target tables; - Design ETL batch process. * Project - Technical Project Leading for the Leonardo project * Description - Technical follow-up of the development team; - Manage weekly project team meeting. * Project - Personnal Initative at Mobistar * Description - Develop Ms-Access application to collect metadata coming from several source databases.

DataWarehouse Architect for Proximus

ProximusFreelance

May 2002 - Oct 2004

2 years 6 months

Brussels, Brussels Region, Belgium · On-site

* Project - DataWebhouse Design for PAW (Proximus Advanced Website) Auditing * Description - Create and design the whole technical architecture for reporting and dimensionnal analysis about traffic on Proximus Website. * Project - Solution Architecture * Description - Analyse business requirements written by end-users; - Create dimensionnal model based on reports requirements; - Design database star-model using ER/Win Modeling; - Design ETL batch process. * Project - Detailed Design * Description - Write Spec (DDL) for DBA: Tables structure, indexes, partitionning, sizing; - Write Spec for SAS Developpers: Mapping between target tables and source tables, ETL algorythm and pseudo-code, testing queries, process flow and data flow; - Write Spec for BO Developpers: BO Universes Specification, BO Reports Specification; - Present kick-off meeting to technical team.

Java Developper for Maas Neotech

Maas NeotechFreelance

Oct 2001 - Dec 2001

3 months

Brussels, Belgium

* Project - Elite Management Software * Description - Development of a java-based software for data acquisition, presentation, and archiving

Human Resources Interim Manager for

UbiCall Communications SAFreelance

May 2001 - Oct 2001

6 months

Mons, Belgium

* Description - Recruitment Task - Benefit and Compensation Package analysis, design, and setup


Education

Deeplearning.ai

OpenAI / ChatGPT

2024 - 2024

1 month

Ressources Formation

NLP Psychoterapist

2004 - 2007

3 years 1 month

Ressources Formation

Master-Practitioner

2001 - 2002

1 year 1 month

Business Objects

Business Objects Certified Universe Builder

1999 - 1999

1 month

Faculté Polytechnique de Mons

Master in Innovation Management

1996 - 1998

1 year 11 months

Faculté Polytechnique de Mons

Civil Engineer (BAC +5)

1989 - 1996

7 years 1 month

Data Vault Alliance

2014 - 1900

Collège Saint Stanislas

1900 - 1900

1 month


Licenses & certifications

Prompt Engineering for ChatGPT

Issued: Jul 2024

Certified by Coursera

Python for Everybody Specialization

Issued: Mar 2016

Certified by Coursera Course Certificates

Capstone: Retrieving, Processing, and Visualizing Data with Python

Issued: Mar 2016

Certified by Coursera Course Certificates

Using Databases with Python

Issued: Nov 2015

Certified by Coursera Course Certificates

Using Python to Access Web Data

Issued: Sep 2015

Certified by Coursera Course Certificates

The Data Scientist’s Toolbox

Issued: Jul 2015

Certified by Coursera Course Certificates

R Programming

Issued: Jul 2015

Certified by Coursera Course Certificates

Programming for Everybody (Python)

Issued: Jul 2015

Certified by Coursera Course Certificates

The best place to find your next move

© 2026. All Rights Reserved.