I'm Stefan Wiesler, a freelance BI consultant and Microsoft-certified Power BI Data Analyst (PL-300). I build the data models and Power BI reports that turn scattered numbers into one version people trust. Billed by the hour, no retainers.
New dashboards, or existing ones reviewed and fixed. Measures are documented and tested against the source, so the numbers can be defended, not just shown.
Star schemas and clean DAX, fed by Power Query, SQL or Microsoft Fabric. Including systems that were never meant to fit together, like a CRM and an ERP.
Your team can maintain and extend what I build. Documentation and a walkthrough are part of every job, remote or as an on-site workshop.
A mid-sized real estate company managing several thousand properties. Its CRM and ERP had never been kept in sync, so service tickets, calls, emails and chat messages could not be tied to the right client or project. I normalised the key fields, built mapping tables and a matching model across both systems.
A mid-sized manufacturer wanted to track sales targets by employee and region. I spread the annual targets over the year on a seasonal curve and built one annual run rate on top, so a weak month with a low target no longer drags the forecast down. The shared KPI logic replaced separate Excel reconciliations.
I started in finance: accounting at a private bank during my business degree, then financial controlling at a mobility start-up and a large law firm. I then spent two and a half years at Deloitte Austria, three months in audit and the rest as a BI consultant, for clients in real estate, manufacturing, retail and gaming. Now I'm completing a Master's in Information Management at NOVA IMS in Lisbon, specialising in Business Intelligence, and taking on freelance work alongside it.
