Sebastian Mitterle
Principal Software Quality Engineer at Red Hat
Miguelturra, Castile-La Mancha, Spain
Summary
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Rockstar🎓
Top SchoolSebastian Mitterle is a Principal Software Quality Engineer with six years in professional QA roles and a decade-plus background in testing, automation, and tooling across enterprise and open-source projects. Based in Spain and currently at Red Hat, he specializes in virtualization test frameworks—contributing substantive reliability fixes and architecture-specific improvements to projects like tp-libvirt and Avocado VT. He blends deep systems-level troubleshooting (including s390x-specific boot and security label handling) with test automation, CI/CD and performance experience from earlier roles at Amazon and in Agile teams. Comfortable in both hands-on test code and strategic test process design, he also brings a mathematics background and a history of teaching and technical documentation that helps translate complex system behaviors into actionable test suites.
6 years of coding experience
11 years of employment as a software developer
Mathematics, Mathematics at Humboldt-Universität zu Berlin
English, German, Spanish, Italian, Basque
Github Skills (13)
bootloader10
libvirt10
automation10
test-framework10
automations10
python10
s390x10
boot10
virtualization10
testing10
scsi9
unit-test9
system-administration9
Programming languages (6)
Github contributions (5)
autotest/tp-libvirt
Sep 2019 - Jan 2023
Test Provider for Libvirt and related virtualization backends
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:403 reviews, 181 commits, 384 PRs in 3 years 4 months
Contributions summary:Sebastian primarily focused on testing and improving the reliability of the `tp-libvirt` project, a test provider for Libvirt and related virtualization backends. Their contributions involved identifying and fixing platform-dependent issues within the tests, such as those related to the `s390x` architecture. The user addressed missing bridge host configurations, updated test expectations for various scenarios, and ensured tests correctly handle situations like libvirtd being offline. Furthermore, the user's work focused on ensuring test failures when a VM could not be started.
pythonprovidertestinglibvirtbackends
avocado-framework/avocado-vt
Oct 2019 - Aug 2022
Avocado VT Plugin
Role in this project:Back-end & System Engineer
Back-end & System EngineerContributions:101 reviews, 43 commits, 84 PRs in 2 years 9 months
Contributions summary:Sebastian primarily contributed to the Avocado VT Plugin, focusing on enhancements and bug fixes related to virtual machine (VM) management and boot processes. Their work involved modifying boot loader entries for s390x architecture, adding support for kernel console settings, and improving the handling of security labels. They also added features such as a timeout constant and helper functions for SCSI and channel subsystem management.
plugin
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