Stefano Cordio
Lead Software Engineer at AssertJ
Opfikon, Zurich, Switzerland
Summary
🤩
Rockstar🎓
Top SchoolStefano Cordio is a Lead Software Engineer with nine years of professional experience building secure, production-grade systems and leading client authentication efforts at EPAM Systems. He combines strong academic roots—double summa cum laude degrees in Computer Engineering from University of Rome Tor Vergata—with hands-on leadership across distributed big-data analytics, digital banking, and payments. An active open-source maintainer for AssertJ and contributor to JUnit 5, he improves developer experience by adding type-safe assertions and hardening test frameworks, work that impacts large Java ecosystems. Comfortable as both architect and implementer, he has a track record of fixing subtle bugs, improving error messages and test coverage, and shipping robust libraries relied on by other engineers. Based in Opfikon, Zurich, he pairs rigorous engineering discipline with practical QA sensibilities, often surfacing improvements that make APIs and tests safer and clearer for downstream users.
9 years of coding experience
7 years of employment as a software developer
Google Summer of Code 2010, Computer Science, Google Summer of Code 2010, Computer Science at VU University AmsterdamMaster’s Degree, Computer Engineering, Summa Cum Laude (110/110), Master’s Degree, Computer Engineering, Summa Cum Laude (110/110) at University of Rome Tor Vergata
Italian, English, German
Stackoverflow
1,980reputation
79kreached
43answers
0questions
java
top-5%
Github Skills (16)
unit-testing10
assertion10
javas10
junit10
assert10
test-framework10
junit-jupiter10
java10
test-automation10
testing10
kotlin6
spring-data-jdbc6
hamcrest6
postgresql6
spring-boot6
Programming languages (11)
Github contributions (5)
assertj/assertj
Apr 2019 - Jan 2023
AssertJ is a library providing easy to use rich typed assertions
Role in this project:
Back-end Developer
Back-end DeveloperContributions:14 releases, 210 reviews, 455 commits in 3 years 10 months
Contributions summary:Stefano focused on enhancing the core functionality of the AssertJ library. Their contributions involved adding and modifying methods within the `AbstractMapAssert` and `AbstractObjectAssert` classes, improving developer experience by introducing type-safe extraction methods. They also addressed bugs related to error message factories and improved the overall quality of the library by adding missing information and addressing typos.
assertionsassertjtestingtyped-assertionstyped
junit-team/junit5
Sep 2020 - Sep 2022
✅ The 5th major version of the programmer-friendly testing framework for Java and the JVM
Role in this project:Back-end Developer & QA Engineer/Test Automation Engineer
Back-end Developer & QA Engineer/Test Automation EngineerContributions:54 reviews, 11 commits, 23 PRs in 2 years
Contributions summary:Stefano's primary contribution was to address bugs and implement enhancements within the JUnit 5 testing framework. Their work focused on fixing issues related to parameterized tests, specifically handling null values and exceptions within the `toString()` implementation. They also added support for new types to the `EmptySource` annotation. Furthermore, the user was responsible for fixing documentation links and improving test cases, including those related to the `@TempDir` annotation, demonstrating a strong understanding of testing principles and JUnit's internal workings.
test-automationjunit-jupitertesting-frameworkjunit-vintagetesting
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