Martijn Kooij
Engineering Lead Security at Snappet Connected Learning
Utrecht Area Netherlands
Summary
👤
Senior🎓
Top SchoolMartijn Kooij is an engineering leader with 11 years of professional experience, currently driving cloud security and AWS architecture as Engineering Lead Security at Snappet in Utrecht. He combines hands-on software craftsmanship—spanning C#, JavaScript, Web Components and identity platforms—with a pragmatic security-first mindset built from migrating legacy systems and designing authentication flows. He has a long history of building reusable engines and automation (from Tangram portals and build pipelines to PGGM’s authentication platform), and maintains a parallel practice developing measurement software for physiotherapy through his own company. Comfortable translating complex requirements into maintainable architectures, he focuses on risk reduction, secure deployments and observable cloud systems. Trained as a CPP-certified software architect, Martijn brings both deep legacy modernization experience and a knack for making instrumented, auditable solutions that teams can operate confidently.
11 years of coding experience
18 years of employment as a software developer
CPP Gecertificeerd Softwarearchitect, CPP Gecertificeerd Softwarearchitect at Open Universiteit
Dutch, English
Stackoverflow
1,380reputation
58kreached
9answers
8questions
msbuild
top-5%
Github Skills (77)
authentication10
on-the-fly10
imgix10
serverless-applications9
saml9
webp9
msbuild9
image9
tiff9
resize9
png9
exif9
jpeg9
avif9
dotnet8
Programming languages (6)
Github contributions (5)
MartijnKooij/PolymorphicPseudonymisation
Aug 2018 - Jan 2020
.Net Standard C# implementation of Polymorphic Pseudonymisation Decryption
Contributions:73 commits, 6 PRs, 57 pushes in 1 year 4 months
csharpdecryptiondotnet
MartijnKooij/AdventOfCode
Dec 2018 - Dec 2025
Contributions:234 pushes, 1 branch in 7 years 1 month
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