My name is Jacek, and Iโm here to help you solve your Excel spreadsheet and data challenges. Whether youโre looking to develop or refresh your spreadsheet skills or someone to help you analyse and process your business data, I can help.
With my Excel and data analytics support, your business can benefit from Financial Modelling, Data Analytics and One-to-One Training. I can help you gain valuable insights into different aspects of your business, identify ways to improve your businessโs performance and workflow, create accurate cash flow forecasts and much more. By bringing data to life through captivating reports, analysis, and insights, I can help your business thrive.
Why Choose ChallengeJP?
- Over 10 Years of Experience โ With over 10 years of experience in Financial Modelling and Data Analysis, I have helped businesses in many industries make sense of their data.
- Take Control of Your Data โ Whether you use my services or Excel training courses, youโll be in control of the process and the result โ you can decide what you want to learn and which aspects of your project youโd like me to take care of for you.
- Personalised One-to-One Solutions โ I offer personalised solutions to help you master spreadsheets and maximise data value. My courses are held on a one-to-one basis, so I can customise them to your skills and pace of learning. I also tailor my financial modelling and data analytics support to your business needs and desired results.
- Hands-On Learning Experience โ Listening, watching and taking notes can only get you so far. ChallengeJP courses give you the chance to apply lessons to practical examples. With hands-on learning experience, youโll develop confidence in using and creating spreadsheets.
- Competitive Pricing โ All of the ChallengeJP services are competitively priced so you can get the help you need without breaking the bank. Whether you use my Excel courses and training to develop your skills or bring me on board to help with a business project, I will always offer you fair and competitive prices.
Latest Blog Posts
Check out my latest blog posts to discover Excel insights, guides and tutorials. My in-depth articles can help you use Excel more efficiently and master the art of data analysis and financial modelling.
How to Build a Marketing Performance and Forecast Dashboard in Microsoft Power BI
Last Updated on October 12, 2025 In this tutorial, weโll build a Microsoft Power BI model that analyzes an always-on online marketing campaign across multiple channels. The model tracks key metrics such as customer acquisition cost (CAC), monthly churn, and average revenue per user (ARPU) to project future customer growth and revenue. Weโll go stepRead More »How to Build a Marketing Performance and Forecast Dashboard in Microsoft Power BI
How to Build a Consolidated P&L and Forecast Model in Microsoft Power BI
Last Updated on October 12, 2025 In this Power BI tutorial, we will build a consolidated Profit & Loss (P&L) across multiple subsidiaries. Weโll start by importing four Fact files and appending them into a single dataset. Next, weโll standardize the chart of accounts by mapping local account codes into common categories and subcategories (Revenue,Read More »How to Build a Consolidated P&L and Forecast Model in Microsoft Power BI
How to Analyze and Forecast Customer Churn and Revenue with Microsoft Power BI
Last Updated on October 12, 2025 In this tutorial, youโll learn how to build a complete customer churn analysis and forecasting model in Microsoft Power BI. Starting with simple CSV datasets, weโll gradually design a robust data model, create calculated columns and DAX measures, and build interactive visuals that reveal customer behavior in detail. YouโllRead More »How to Analyze and Forecast Customer Churn and Revenue with Microsoft Power BI
