My name is Jacek, and I’m here to help you solve your Excel spreadsheet and data challenges. Whether you’re 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 business’s 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 — 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 — Whether you use my services or Excel training courses, you’ll be in control of the process and the result — you can decide what you want to learn and which aspects of your project you’d like me to take care of for you.
- Personalised One-to-One Solutions — 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 — 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, you’ll develop confidence in using and creating spreadsheets.
- Competitive Pricing — 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 Yield Management and Inventory Analysis Dashboard in Microsoft Power BI
Last Updated on January 7, 2026 This tutorial walks through building a yield-focused Power BI dashboard for analyzing advertising inventory performance across campaigns and providers. You’ll learn how to structure data, create reusable DAX measures, and design visuals that support yield management, inventory monetization, and performance optimization. We begin by loading and modelling campaign andRead More »How to Build a Yield Management and Inventory Analysis Dashboard in Microsoft Power BI
How to Build a Project Finance and Revenue Recognition Dashboard in Microsoft Power BI
Last Updated on January 2, 2026 This tutorial shows how to build a project finance and revenue recognition model in Microsoft Power BI using projects, contracts, CAPEX, and billing data. The model focuses on how capital investment, contract value, and cash flows evolve over time in long-lived projects, where costs are incurred before revenue isRead More »How to Build a Project Finance and Revenue Recognition Dashboard in Microsoft Power BI
How to Build a Project Planning and Cost Management Dashboard in Microsoft Power BI
Last Updated on January 2, 2026 In this tutorial, we will build a complete project planning and project cost management dashboard in Microsoft Power BI using a realistic construction-style dataset. The example is based on a construction project plan, but the same approach works just as well for IT projects, consulting engagements, manufacturing rollouts, orRead More »How to Build a Project Planning and Cost Management Dashboard in Microsoft Power BI