Ruel Pagayon
Principal Security Engineer at Klarna
Stockholm, Stockholm County, Sweden
Summary
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SeniorRuel Pagayon is a Principal Security Engineer based in Stockholm with 15 years of experience designing resilient, hard-to-break software and shaping security architecture at scale. At Klarna he leads the Engineering Assurance domain, setting strategic technical direction and embedding secure development practices early in the lifecycle. His background spans hands-on security engineering, management, and backend systems for communications—VoIP, messaging, and SMSC integrations—built during a long tenure at Voyager Innovations. Ruel blends research-driven problem solving (unsupervised learning for customer profiling) with practical platform engineering, reducing operational costs and improving voice and messaging reliability. Known as a security architect on GitHub, he brings both deep protocol-level expertise and a knack for turning complex security requirements into auditable, production-ready solutions.
15 years of coding experience
14 years of employment as a software developer
English, Filipino
Stackoverflow
15,568reputation
3.3mreached
300answers
17questions
perl
top-5%
cmd
top-5%
apache
top-5%
php
top-1%
regex
top-5%
html
top-5%
Github Skills (52)
php10
apache9
regex9
perl9
cmd9
html9
connected8
messaging7
lists7
message-queue7
aio7
compile7
broker7
erlang7
asp-net6
Programming languages (2)
Github contributions (5)
VoyagerInnovations/esmpp
Dec 2016 - Jun 2017
Contributions:73 commits, 22 pushes, 1 branch in 5 months
client-libraryerlangsmppsmpp-client
ruel/google-token-erlang
Oct 2016 - May 2018
Contributions:13 commits, 6 pushes, 1 branch in 1 year 6 months
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