Sergio López
Principal Site Reliability Engineer at Red Hat
Greater Barcelona Metropolitan Area Spain
Summary
🤩
Rockstar🎓
Top SchoolSergio López is a Principal Site Reliability Engineer at Red Hat with 15 years of experience designing and operating resilient cloud-native infrastructure across Linux, containers, and virtual machines. He blends deep systems and backend engineering—contributing to high-profile open-source projects like cloud-hypervisor and the crun OCI runtime—with hands-on SRE work in production at scale. His expertise spans microVMs, trusted execution (AMD SEV), container image tooling, and debugging toolchain improvements, reflecting both low-level systems knowledge and platform reliability practice. Based in the Greater Barcelona area, he has a strong track record in customer-facing cloud migrations, performance tuning, and automation across AWS/GCP/Azure and Kubernetes ecosystems. A detail-oriented engineer, he has also solved niche cross-platform issues such as enabling x86_64 microVMs on ARM64 macOS via Rosetta and macOS-specific container handling.
15 years of coding experience
10 years of employment as a software developer
UPC Universitat Politècnica de Catalunya
Spanish, Catalan, English
Github Skills (41)
debugging10
debug10
container10
device-management10
filesystem10
system-programming10
dwarf10
qemu10
linux10
c-programming10
buildah10
c1110
containerization10
virtio10
c1710
Programming languages (19)
Github contributions (5)
containers/krunvm
Jan 2021 - Nov 2022
Create microVMs from OCI images
Role in this project:
Back-end & Systems Engineer
Back-end & Systems EngineerContributions:12 releases, 6 reviews, 48 commits in 1 year 9 months
Contributions summary:Sergio primarily contributed to the `krunvm` project by implementing core functionalities and addressing system-level compatibility issues. They focused on integrating with `buildah` for container image management, including creating, mounting, and unmounting containers, along with defining appropriate command arguments. The user added support for macOS-specific operations using `xattr` and Rosetta for Linux to enable x86_64 microVMs on ARM64. They also made several improvements regarding buildah configuration, environment variables and dependency management to improve the usability.
firecrackerlibvirtmicrovmscloud-initdocker
containers/crun
Feb 2021 - Nov 2022
A fast and lightweight fully featured OCI runtime and C library for running containers
Role in this project:Backend Developer
Backend DeveloperContributions:16 reviews, 5 commits, 5 PRs in 1 year 9 months
Contributions summary:Sergio primarily contributed to the `crun` runtime's integration with the `libkrun` library, focusing on enabling microVM support. Their work included setting the working directory within the `libkrun` context, limiting vCPUs, and using the library's soname for dynamic linking. Further contributions involved adding support for the `krun-sev` variant, allowing for trusted execution environments using AMD SEV/SEV-ES/SEV-SNP.
containersruncc-libraryiot-cloudlinux
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