Mats Alm - Founder at EPPlus Software

Mats Alm

Founder at EPPlus Software

Stockholm, Sweden

Join Prog.AI to see contacts

Summary

🤩

Rockstar

🎓

Top School

Mats Alm is a founder and seasoned back-end engineer with 16 years of experience, best known for co-founding EPPlus Software, the commercial steward of the widely used EPPlus .NET Excel library (≈50M NuGet downloads). He combines hands-on development and architecture work with product leadership, having previously served as CTO and chief architect roles during the project's evolution from open source to a commercial offering. Mats focuses on reliability and correctness in spreadsheet formula calculation engines, contributing deep fixes for circular references, range handling and text/formula edge cases. He has a practical, systems-oriented academic grounding from Stockholms universitet in data/systemvetenskap and a track record of shipping robust, high-usage libraries. Colleagues describe him as a pragmatic engineer who surfaces subtle algorithmic issues that improve accuracy and performance at scale.

16 years of coding experience

Foundation degree, Data/Systemvetenskap 80 p, Foundation degree, Data/Systemvetenskap 80 p at Stockholms universitet

English, German, Spanish

Stackoverflow

Stats

269reputation

23kreached

12answers

1question

Github Skills (15)

unit-testing10

asp-net10

net10

dotnet10

data-validation10

csharp10

parsing10

excel10

parse10

dotnet-core10

test-automation10

xlsx6

epplus6

export-to-excel6

asp-net-core6

Programming languages (3)

C#JavaScriptHTML

Github contributions (5)

JanKallman/EPPlus

Feb 2010 - Mar 2020

Create advanced Excel spreadsheets using .NET

Role in this project:

Back-end Developer

Contributions:263 commits, 3 PRs, 17 pushes in 10 years 2 months

Contributions summary:Mats contributed to the EPPlus library by implementing autofilter features, data validation, and the textlength validation feature. Their work involved modifying existing classes and adding new functionality, including adding basic functionality for whole, decimal and list. They added and fixed several bugs to the code.

dotnetexcelooxmlspreadsheet

EPPlusSoftware/EPPlus

Jan 2020 - Jan 2023

EPPlus-Excel spreadsheets for .NET

Role in this project:

Back-end Developer & Test Automation Engineer

Contributions:3 releases, 33 reviews, 525 commits in 3 years

Contributions summary:Mats implemented several changes focused on improving circular reference handling and formula calculations, including functions like SUM, AVERAGE, and others. They addressed a specific issue regarding text handling in formula calculations and introduced a new method to handle ranges in calculations. The contributions indicate a focus on improving the accuracy, reliability and performance of the formula calculation engine.

dotnetepplusexcelnetframeworknetcore

Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.

Request Free Trial