Duco Haal  |  Independent BI Developer

Turning data into
clear decisions

I help organizations unlock value in their data — through easy to use dashboards, solid data models, and BI strategies that actually work.

Get in touch View services
Data Pipeline
Data Sources Extract
ERP CRM SQL DB Excel API Exact Dynamics
Transform & Clean Process
Deduplicate Normalize Enrich Validate
Data Warehouse Store
Rows loaded
2.4M
Last refresh
06:00
Power BI Dashboard Report
Revenue
€2.4M
▲ 12%
Orders
1,847
▲ 8%
Trend

About

Hi, I'm Duco.

I'm an independent Business Intelligence developer based in the Netherlands, operating under DNH BI. I work with organizations locally and internationally to design and build data solutions that are reliable, intuitive, and built to scale.

My work spans the full BI lifecycle — from raw data extraction and warehousing to polished dashboards that decision-makers actually use. I value clarity, craftsmanship, and long-term thinking.

7+
Years of experience
15+
Projects delivered
10+
Clients served
2
Interim assignments

Services

What I can do for you

Dashboard & Reporting

Interactive, well-structured dashboards in Power BI — designed for clarity and built to be used every day by the people who matter.

Data Modeling

Scalable, clean data models that power reliable analytics. Star schemas, dimensional modeling, and semantic layer design.

Data Extraction & Warehousing

End-to-end pipelines that move and transform data from source systems into a structured, query-ready warehouse — built for performance and maintainability.

BI Strategy & Consulting

Defining your BI roadmap, tool selection, governance, and data culture — so your investment in data delivers lasting value.

Clients

Trusted by great teams

I've worked with organizations locally and internationally, from scale-ups to established enterprises.

Stedin
Energy & Infrastructure Stedin Developed Power BI dashboards covering strategic, tactical and operational project performance. Coordinated a team of business analysts.
FTMC Safety
Education & Training Services FTMC Safety Built reporting solutions to support business operations.
Infradax
IT Services Infradax Built a financial dashboard for the CFO.
Locomotive Furniture
Retail & E-commerce Locomotive Furniture Built a data warehouse consolidating raw data into a clean, structured foundation — with a dashboard on top turning it into actionable insights.
KWHB
Healthcare KWHB Built dashboards aligned to organisational KPIs for continuous quality improvement reporting.
Mentha
Private Equity Mentha Developed reporting infrastructure and analytics tools for private equity portfolio management.
Nouryon
Chemicals & Industry Nouryon Supported a large-scale reporting environment (2000+ users, 50+ reports), maintaining and improving semantic models and dashboards.
Active Capital Company
Private Equity Active Capital Company Developed dashboards to track portfolio performance and investment KPIs.

Contact

Let's work together

Have a project in mind, or just want to explore what's possible with your data? I'd love to hear from you. I typically respond within one business day.

Send me an email →
duco@dnhbi.com Duco Haal +31 6 30 19 88 13