Speaker

Vojtěch Šíma

Vojtěch Šíma

Power BI Guy

Prague, Czechia

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I've always been driven by the desire to make life simpler and to help people make better decisions with less time spent on manual tasks. This is what led me to become deeply interested in Power BI. My first encounter with Power BI was a few years ago, and since then, it has been a constant part of my daily professional life. Not long after starting my career in Power BI, I began exploring opportunities to coach others in this area. I've had the privilege of conducting numerous training sessions in various companies, while also juggling roles as a full-time Power BI developer and a freelance contractor. My approach has always been about sharing knowledge and practical skills in Power BI, which I hope makes a real difference in people’s work lives.

Area of Expertise

  • Information & Communications Technology

Topics

  • power bi
  • Microsoft Power BI
  • Data Science & AI
  • Data Analytics
  • Data Engineering

REST APIs as Data Source in Power BI

In this session, we’ll explore how to use REST APIs as data sources in Power BI. We’ll start with the essentials of working with Web.Contents() function and discuss the most common authentication methods used in API connections. You’ll also learn how to handle pagination effectively to retrieve large datasets. The session focuses on practical examples, including tips and tricks to optimize your queries. The session will revolve mostly around Power Query and its M language.

Next-Gen Power BI: Build Flexible and Customizable Reports

Discover how to create adaptable reports in Power BI, enabling users to customize their views on the fly without bookmarks or prebuilt visuals. This session will explore the latest tools and updates in Power BI that facilitate the creation of flexible, future-proof reports. We'll cover built-in features for dynamic reporting, including field parameters and innovative uses of numerical ranges. Additionally, we'll delve into new Semantic Model capabilities like built-in Calculation Groups, demonstrating how to show more but with less DAX. You'll also learn how to implement dynamic formatting and adaptive titles to ensure your reports look tidy and professional.

Master REST APIs in Power BI (M language)

In this session, you will learn how to write your own M language code to effectively connect, parse, and build data models using REST APIs. The session will provide examples from professional experiences, highlighting best practices and key considerations for working with REST APIs. We will use real-world examples from either the JIRA Cloud REST API or the Power BI REST API, covering aspects such as GET and POST methods, authentication, pagination, and more.

Modeling in Power BI: How does it work in real life

Many of you have already heard about the basics of modeling in Power BI and what an ideal data model should look like—such as a beautiful star schema. However, reality is often different. You have to work with diverse data sources that aren’t always designed for efficient modeling.

In this session, I’ll share practical experiences with the types of data sources you’ll actually work with—whether it's a single large flat table without dimensions or multiple fact tables without primary keys. We’ll explore how to turn them into a functional and fast data model in Power BI.

DAX Query: Next-Level Data Source Insights

Lost in a sea of reports with no clear view of your data sources? Sure, you could dig through them manually or use the Power BI REST API—but neither tells the full story. DAX Query changes that, and it’s super easy! With its latest capabilities, you can reveal every table, M transformation, SQL statement, and file path powering your reports.

In this session, we'll explore how to implement these insights effortlessly using many Microsoft Power components, giving you complete visibility and control over your data sources.

Power BI Day 2025

Modeling in Power BI: How does it work in real life

March 2025 Prague, Czechia

SQL Server Bootcamp 2024

Master Power Query - Introduction to M language

September 2024 Brno, Czechia

Power BI Day 2024

Master Power Query - Introduction to M language

March 2024 Prague, Czechia

Vojtěch Šíma

Power BI Guy

Prague, Czechia

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