Javier Santos
Senior Software Engineer at Datadog
Madrid, Community of Madrid, Spain
Summary
👤
Senior🎓
Top SchoolJavier Santos is a Senior Software Engineer based in Madrid with over 20 years of experience designing and delivering complex systems, particularly in Java and J2EE architectures. He has led large development teams and acted as chief architect on major tolling and portal modernization projects, bringing products from design through deployment. Currently at Datadog, he contributes to open-source security tooling—notably enhancing IAST features in the widely used dd-trace-java APM client—combining backend engineering with application security expertise. A pragmatic leader and hands-on coder, he thrives under pressure as both an individual contributor and team lead, and his background in physics underpins a methodical, systems-oriented approach to problem solving.
3 years of coding experience
22 years of employment as a software developer
Degree in physics, Physics, Degree in physics, Physics at Universidad de Salamanca
English, Spanish
Github Skills (12)
it-security10
javas10
performance-monitor10
performance-monitoring10
application-monitoring10
java10
apm10
security10
tracer9
taint9
trace9
distributed-tracing9
Programming languages (3)
Github contributions (3)
DataDog/dd-trace-java
Jul 2022 - Jan 2023
Datadog APM client for Java
Role in this project:
Back-end Developer & Security Engineer
Back-end Developer & Security EngineerContributions:234 reviews, 78 commits, 77 PRs in 6 months
Contributions summary:Javier primarily contributed to implementing and enhancing security features within the Datadog APM client for Java, specifically focusing on IAST (Interactive Application Security Testing) functionality. Their work included addressing issues in the `HttpServletDecorator` that caused AppSec failures, and implementing weak hashing and weak cipher detection. The user also added an IAST-enabled flag to spans for request end events and implemented taint propagation for `toUpperCase`/`toLowerCase` and `trim` methods.
apm-clientapmbytebuddydatadoghqtracing
DataDog/system-tests
Nov 2022 - Dec 2022
Test framework for libraries and agents.
Contributions:35 reviews, 5 commits, 32 PRs in 1 month
end-to-end-testingfunctional-testingtestingblackbox-testingagents
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