Tom is available for hire
Hire TomTom Welgemoed
Verified Expert in Engineering
Data Warehouse Design Developer
Baarn, Netherlands
Toptal member since November 21, 2020
Bio
Tom has been a data architect and visualization expert for 19 years, eight of which he spent working for Accenture, a Big 5 consultancy. His passion is to use data to help improve the way organizations perform, whether that be through coaching, consulting, or delivering the solution himself. Tom has a variety of skills that include data modeling, architecture, visualization, and team leadership.
Portfolio
Abn Amro
Azure, Data Architecture, Solution Design, Microsoft Excel, Outlook...
Thom Browne, Inc.
Microsoft Power BI, Reporting, Microsoft Excel, ETL, SAP, Visualization
APG
Qlik Sense, Alteryx, Data Extraction, APIs, Integration, Microsoft Excel...
Experience
- Data Warehouse Design - 16 years
- Data Architecture - 12 years
- Data Visualization - 11 years
- Database Management - 10 years
- Agentic Coding - 3 years
- Agentic AI - 3 years
Work Experience
Data Solution Architect
2021 - PRESENT
Abn Amro
- Created a data architecture roadmap to highlight the journey to a cloud-based platform and process.
- Supported the creation of a future state architecture for all applications.
- Built the solution design for a single customer view project.
Technologies: Azure, Data Architecture, Solution Design, Microsoft Excel, Outlook, Microsoft Power Apps, Automation, Data Warehousing, OpenAI API, XML, Retrieval-augmented Generation (RAG), Artificial Intelligence (AI), Data, Data Strategy, Power Query, Dimensional Modeling, Git, Data Modeling, API Integration, Reports, Microsoft Fabric, Microsoft Power BI, B2B, Visualization
Power BI Data Engineer
2025 - 2025
Thom Browne, Inc.
- Designed and created Power BI dashboards to automate manual Excel reports and to enable AI insights.
- Built Power Apps platform to help track sales budgets and forecasts.
- Performed data migration activities to merge data from the online API system (JOOR) to Excel.
- Built API connectivity and liaised with the JOOR account team to incorporate new data feeds.
Technologies: Microsoft Power BI, Reporting, Microsoft Excel, ETL, SAP, Visualization
DevOps Specialist
2021 - 2021
APG
- Developed a front-end dashboard to help track taxes due globally for APG.
- Fostered a user community around Alteryx, hosting various workshops and community meetings and uploading content onto the SharePoint site.
- Consulted projects as an Alteryx SME to ensure accurate delivery and success.
Technologies: Qlik Sense, Alteryx, Data Extraction, APIs, Integration, Microsoft Excel, Data Warehousing, Microsoft Power Automate, Dashboards, Airtable, Make (formerly Integromat), Artificial Intelligence (AI), Data, Data Strategy, Complex Models, Power Query, Dimensional Modeling, Git, Data Modeling, API Integration, Reports, B2B, Visualization
Data Architect and Visualization Expert
2019 - 2021
Philips
- Developed a Qlik Sense dashboard that monitors and projects inventory volumes across all B2B products for the forthcoming year.
- Created a data model in Microsoft Azure to support end-to-end sales and order management monitoring and performance tracking to ensure a better customer experience and revenue recognition.
- Designed a dashboard in Qlik Sense to enable order management teams to easily identify priority order issues and root causes to expedite resolution and on-time delivery.
- Led projects technically and directed the efforts of other developers to deliver the target architecture.
- Liaised with senior stakeholders and represented the project at the steering committee level.
Technologies: Data Management, Database Modeling, Data Architecture, Data Visualization, SQL, Qlik Sense, Azure Synapse, Business Intelligence (BI), Data Analysis, Data Analytics, Data Extraction, Microsoft Power BI, Integration, Microsoft Excel, Python, Data Warehousing, Data Engineering, Data Lakes, Cloud Dataflow, DAX, Dashboards, Data, Data Strategy, Complex Models, Power Query, Dimensional Modeling, Data Modeling, Reports, Azure, B2B, Visualization
Data Visualization Team Lead
2017 - 2019
Accenture
- Set up, led, and grew the data visualization team in the Netherlands by 100%. Effectively held responsibility for career coaching, role placement, and hitting key performance KPIs.
- Led the technical team and data delivery aspects of a multi-year, multi-million pound B2B UK telecoms data warehouse and KPI reporting capability. Technologies included Netezza, Alteryx, Qlik Sense, and Informatica.
- Designed very successful data and ETL architecture for a large data migration project using Alteryx and Microsoft technologies. The resulting solution saved approximately 50-75% in resource cost.
- Built a KPI dashboard for a large hospitality-based firm based in the Netherlands. Created the solution in Qlik Sense in only one to two weeks.
Technologies: Coaching, Stakeholder Management, Data Architecture, Project Management, Qlik Sense, Alteryx, Technical Leadership, Team Leadership, Data Visualization, Data Extraction, Microsoft Power BI, Tableau, APIs, Asana, Integration, Microsoft Excel, Data Warehousing, DAX, Dashboards, Data, Data Strategy, Complex Models, Power Query, Dimensional Modeling, Data Modeling, Reports, B2B, Visualization
Data Visualization Manager and Consultant
2011 - 2017
Accenture UKI
- Led one of the most inventive projects for real-time sports analytics. Blended data ingestion, visualization in near real-time, storytelling, cloud hosting, predictive analytics, and feeding unique performance insights to over 1 million mobile users.
- Designed, technically led, and built a complex B2B telecoms solution for a large B2B client to unify the customer journey. Delivered a single customer view that is the cornerstone of the client's analytics framework.
- Spoke at various public engagements regarding solutions built, including the Alteryx conference, Twickenham rugby stadium, and multiple clients such as Vodafone, Virgin Media, and RBS.
Technologies: Consulting, ETL, Database Management, Microsoft SQL Server, Alteryx, Qlik Sense, Data Extraction, Microsoft Power BI, Tableau, APIs, Integration, Microsoft Excel, Data Warehousing, Data Engineering, Data Lakes, Cloud Dataflow, JSON, XML Schema, Dashboards, Data, Data Strategy, Complex Models, Dimensional Modeling, Data Modeling, Reports, B2B, Visualization
Business Intelligence Team Lead
2009 - 2011
Talk Talk
- Led a team of 15 onshore and offshore developers to meet all our clients' reporting needs.
- Delivered a major data migration project that would save the company 500,000 per month once delivered.
- Created a new telco data warehouse, including customer base and movements reporting, call data record (CDR) reporting, and aged debt reporting.
- Saved the company GBP 18 million (in regulatory fines) by creating a report that would help ensure the company did not wrongfully bill customers who indicated they wanted to disconnect.
Technologies: Data Migration, Business Intelligence (BI), SQL, Database Modeling, Informatica, ETL, Team Leadership, Data Extraction, Excel 365, Outlook, Data Warehousing, Data Engineering, Data, Data Strategy, Complex Models, Dimensional Modeling, Data Modeling, Reports, Informatica Cloud
Data Warehouse Architect | BI Expert
2006 - 2009
Carphone Warehouse
- Designed and evolved the data warehouse globally for the Carphone Warehouse as one of six data architects.
- Delivered a complex, cross-European customer and address-matching solution. This single customer view improved customer management and targeting (marketing) opportunities.
- Coached and led a team of four external partner developers to grow the existing platform.
Technologies: Team Leadership, Data Modeling, Informatica, Data Warehouse Design, Data Warehousing, Cryptocurrency, Oracle, Netezza, Business Intelligence (BI), Data Extraction, Excel 365, Outlook, Data Engineering, Data, Data Strategy, Dimensional Modeling, Reports
Project History
Real-time Sports Analytics
I created, designed, and led the RBS 6 Nations program's analytics delivery as part of the Accenture Technology sponsorship between 2013-2017. Our end product was a real-time dashboard shown exclusively to clients in our hospitality suite on match days. We also created a mobile app data feed viewed by more than 1 million global users on match days. My role was to innovate with the available data and then design, build, and lead the effort to bring the innovations to life for clients.
Ukraine at War Dashboard
This dashboard was created to commemorate the 2nd anniversary of the Ukraine-Russia war.
The missile attack data is automatically updated with data from a public site once that data becomes available. It was designed to highlight the plight of Ukrainians.
The missile attack data is automatically updated with data from a public site once that data becomes available. It was designed to highlight the plight of Ukrainians.
A Low-code Power App Dashboard to Automate Decisions at an Energy Client
https://decisioncrew.com/portfolio/streamline-business-operations-with-process-automation/A Dutch energy client approached my team and me to analyze their business processes and identify bottlenecks caused by manual data management tasks.
KEY REQUIREMENTS
• Streamline business operations
• Eliminate manual tasks
• Achieve significant cost savings
• Obtain expert recommendations for automation
Our strategic planning process aimed to automate manual processes, enhance data-driven decision-making, and provide a competitive advantage through smart, informed decisions.
By implementing business process automation, our energy sector client streamlined their operations, enabling smarter, data-driven decisions with ease.
KEY ACHIEVEMENTS
• Introduced low-code apps: Utilized Microsoft Power Apps for intuitive data interaction
• Enhanced accessibility: Simplified user interface for team members without technical expertise
• Increased decision-making speed: Empowered broader employee participation, shortening response times
• Seamless integration: Integrated with third-party systems to eliminate data silos and manual work
• Efficiency and innovation: Automated repetitive tasks, allowing focus on high-impact projects
This transformation has significantly improved operational efficiency and decision-making capabilities.
KEY REQUIREMENTS
• Streamline business operations
• Eliminate manual tasks
• Achieve significant cost savings
• Obtain expert recommendations for automation
Our strategic planning process aimed to automate manual processes, enhance data-driven decision-making, and provide a competitive advantage through smart, informed decisions.
By implementing business process automation, our energy sector client streamlined their operations, enabling smarter, data-driven decisions with ease.
KEY ACHIEVEMENTS
• Introduced low-code apps: Utilized Microsoft Power Apps for intuitive data interaction
• Enhanced accessibility: Simplified user interface for team members without technical expertise
• Increased decision-making speed: Empowered broader employee participation, shortening response times
• Seamless integration: Integrated with third-party systems to eliminate data silos and manual work
• Efficiency and innovation: Automated repetitive tasks, allowing focus on high-impact projects
This transformation has significantly improved operational efficiency and decision-making capabilities.
Education
1998 - 2002
Bachelor's Degree in Information Technology and Economics
North West University - South Africa
Certifications
FEBRUARY 2021 - FEBRUARY 2023
Microsoft Azure Data Engineer
Microsoft
NOVEMBER 2020 - NOVEMBER 2022
Alteryx Core Designer
Alteryx
OCTOBER 2019 - PRESENT
Qlik Sense Business Analyst
Qlik
OCTOBER 2018 - OCTOBER 2020
Alteryx Advanced
Alteryx
JUNE 2009 - PRESENT
Agile Scrum Master
Scrum Alliance
Skills
Libraries/APIs
OpenAI API
Tools
Qlik Sense, Microsoft Power BI, Microsoft Excel, Power Query, Tableau, Microsoft Power Apps, Cloud Dataflow, Git, Asana, Make (formerly Integromat)
Languages
SQL, Snowflake, Python, XML
Paradigms
ETL, Business Intelligence (BI), Dimensional Modeling, B2B, Agile, Database Design, Automation, Object-oriented Programming (OOP)
Platforms
Alteryx, Azure Synapse, QlikView, Azure, Microsoft Fabric, Databricks, Oracle, Amazon Web Services (AWS), Microsoft Power Automate
Storage
Database Modeling, Database Management, Microsoft SQL Server, Data Lakes, JSON, XML Schema, Netezza
Industry Expertise
Project Management, Banking & Finance
Other
Data Visualization, Data Architecture, Data Management, Data Profiling, Technical Leadership, Coaching, Consulting, Data Warehousing, Data Warehouse Design, Data Modeling, Data Engineering, Data Analysis, Data Analytics, Data Extraction, Excel 365, Integration, Dashboards, Data, Data Strategy, Complex Models, Reports, Visualization, Geospatial Analytics, Team Leadership, Cloud Computing, APIs, Outlook, DAX, Airtable, API Integration, AI Agents, Agentic Coding, Agentic AI, Stakeholder Management, Economics, Econometrics, System Design, Decision Support Systems (DSS), Decision Analysis, Scrum Master, Informatica, Data Migration, Cryptocurrency, Designing for Data, Solution Design, Retrieval-augmented Generation (RAG), Artificial Intelligence (AI), Business Process Automation, Informatica Cloud, formaloo, Azure Databricks, Reporting, SAP
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
Start hiring