Sietse Ringers
Software Architect And Cryptographer at ICTU
Randstad, Netherlands
Summary
👤
Senior🎓
Top SchoolSietse Ringers is a software architect and cryptographer with 11 years of experience building privacy-preserving digital identity systems, currently contributing to the NL digital identity wallet at ICTU. He holds a PhD in Mathematics and Computer Science and has a strong research-to-production track record implementing attribute-based credentials, polymorphic encryption, and authentication protocols across academia, non-profit projects and government. Previously he led IRMA development and served as an architect/engineer at SIDN and as a project lead at the Privacy by Design Foundation, blending hands-on cryptographic engineering with architecture and project leadership. Sietse’s work uniquely bridges formal research—stemming from his doctoral work in differential geometry and quantization—with pragmatic software delivery, making advanced privacy tech usable in real-world systems. Colleagues value him for translating complex cryptographic primitives into auditable, scalable implementations for national-scale identity infrastructure.
11 years of coding experience
8 years of employment as a software developer
Doctor of Philosophy (PhD) Mathematics and Computer Science, Doctor of Philosophy (PhD) Mathematics and Computer Science at University of GroningenM.Sc. Mathematical Physics, M.Sc. Mathematical Physics at University of AmsterdamISG Arcus
Dutch, English, German
Stackoverflow
101reputation
0reached
0answers
0questions
Github Skills (131)
tooling10
identity10
democracy10
security10
client-server10
wallet10
open-government10
foundation10
typescript10
android10
scheme10
ios10
privacy10
editor9
ruby9
Programming languages (16)
Github contributions (5)
credentials/irma_android_cardemu
Jun 2015 - Jan 2018
Contributions:449 commits, 127 pushes, 9 branches in 2 years 7 months
privacybydesign/irma-demo-schememanager
Oct 2017 - Jan 2022
irma-demo scheme manager
Contributions:21 reviews, 87 commits, 51 PRs in 4 years 3 months
schemetypescript
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