Practical problem solving.
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ExcelMastas is an independent Excel automation and consulting practice founded by Dénes Losonc, focused on making real business processes faster, clearer, and easier to run.
Hi, I'm Dénes.
I'm an Excel/VBA specialist with more than a decade of hands-on spreadsheet problem solving and several years of professional freelance delivery.
My earlier work in automotive failure analysis taught me to ask questions, trace causes, understand processes, and build tools that solve real operational problems—not just make spreadsheets prettier.
That mindset carries into my Excel work today: whether I’m automating recurring reports, developing a custom CRM-style workbook, or rebuilding a complex operations tracker, I want the result to make sense for the people who will use it.
My approach is Excel-first, but never Excel-at-any-cost. When a requirement is beyond what a workbook should safely handle, I’ll say so.
A professional portrait and verified portfolio screenshots can be added here later. No stock photograph is used to represent me.
Systems first. Spreadsheets second.
A dependable Excel tool needs more than correct syntax.
Find the real bottleneck
Understand why a workflow is slow, fragile, or error-prone before proposing a macro.
Design for reliability
Consider validation, error cases, data integrity, and maintainability—not only the happy path.
Make it usable
Interfaces, instructions, and controls should fit your team instead of making the workflow harder.
Your Excel problem deserves a better system.
Tell me what takes too long, keeps breaking, or feels more complicated than it should. We’ll start with the workflow, not a sales pitch.
Start a project conversation