Mathias Karlsson
Technical Security at Kivra
Västra Götaland County, Sweden
Summary
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SeniorMattias Karlsson is a versatile Partner and Technical Fellow with over 12 years of hands-on experience architecting and delivering business-critical systems across e-commerce, billing, logistics, finance, and trading for clients in the Nordics, Baltics and China. He blends deep Microsoft-platform expertise (SQL Server, Windows Server, Azure, Containers, UWP) with broad experience across languages, databases and BI stacks, making him skilled at integrations, migrations and consolidating legacy infrastructures. As a former board member of the .NET Foundation and long-time consultant, he pairs technical leadership with client-facing project management, sales and team coordination. He also contributes to open-source security tooling—improving altdns for more robust subdomain enumeration and resolution—highlighting a practical interest in reliability and security. Colleagues describe him as a pragmatic problem-solver who often ships solutions before formal training catches up, and who balances technical depth with strong social and mentoring skills. Based in Västra Götaland, Sweden, he focuses on connecting disparate systems and turning complex IT landscapes into maintainable, modern platforms.
12 years of coding experience
6 years of employment as a software developer
Swedish, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (11)
threaded10
dns10
enumerate10
thread10
subdomain10
python10
hyper-threading10
multithreading10
enumeration10
network-security9
information-security9
Programming languages (6)
Github contributions (5)
infosec-au/altdns
Jun 2016 - Jun 2016
Generates permutations, alterations and mutations of subdomains and then resolves them
Role in this project:
Security Engineer
Security EngineerContributions:14 commits, 4 PRs in 1 day
Contributions summary:Mathias primarily contributed to improving the functionality and robustness of `altdns`, a tool for subdomain enumeration. They added features like number suffix permutations, A record lookups, and a wildcard check. Moreover, the user focused on improving the threading capabilities and incorporating time tracking to provide more efficient subdomain resolving. The changes also included bug fixes in DNS lookups and general improvements to the code's overall performance.
golangpermutationspenetration-testinginfosecsubdomains
avlidienbrunn/avlidienbrunn_is_my_hero
Aug 2015 - Jun 2019
Contributions:20 commits, 18 pushes, 2 branches in 3 years 11 months
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