Guillaume Hérail
Principal Service Reliability Engineer at Sony Interactive Entertainment
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolGuillaume Hérail is a Principal Service Reliability Engineer based in Berlin with 11 years of experience building and operating large-scale, production-critical systems. He has progressed through senior SRE roles at Sony Interactive Entertainment since 2018, owning resilience and observability for complex services at scale. Earlier, he helped design and run a company-wide infrastructure at QUALTERA—building CI/CD, monitoring, and on-prem deployments as the second hire and leading a follow-the-sun ops team. A pragmatic back-end developer, Guillaume contributes to notable open-source projects such as prometheus-operator and SFTP support for go.crypto/ssh, with a focus on modular refactoring and robust protocol handling. He combines deep systems knowledge (Cassandra, Elasticsearch, Kubernetes, Prometheus) with hands-on coding and automation skills, often improving maintainability rather than just adding features. Outside the data center, his background in mountain rescue hints at calm, methodical decision-making under pressure.
11 years of coding experience
14 years of employment as a software developer
BTS IG ARLE Computer Science, BTS IG ARLE Computer Science at CFAI LRNational Conservatory of Arts and CraftsBAC STI Electrotechnique, BAC STI Electrotechnique at Lycée de la Borde Basse
French, English, German
Github Skills (13)
monitoring10
kubernetes10
go10
prometheus10
sftp10
back-end-development10
kubernetes-pods10
ssh10
ftp-protocol9
error-handling9
file-transfer9
api-design8
testing7
Programming languages (9)
Github contributions (5)
prometheus-operator/prometheus-operator
Jan 2023 - Jan 2023
Prometheus Operator creates/configures/manages Prometheus clusters atop Kubernetes
Role in this project:
Back-end Developer
Back-end DeveloperContributions:208 reviews, 12 commits, 27 PRs in 3 days
Contributions summary:Guillaume's commits primarily focus on splitting types related to Alertmanager and Probe within the prometheus-operator project, breaking them into their own files. They also worked on splitting PrometheusRule, PodMonitor, and ServiceMonitor types into their own files, improving the project's modularity. These changes indicate a focus on organizing and refactoring the project's codebase related to monitoring configurations within Kubernetes.
kubernetesprometheusprometheus-operatormonitoring
pkg/sftp
Dec 2015 - Apr 2017
SFTP support for the go.crypto/ssh package
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 commits, 2 PRs, 9 comments in 1 year 4 months
Contributions summary:Guillaume focused on improving the SFTP support within the `go.crypto/ssh` package. They added SFTP version 6 status codes, corrected file removal logic, and addressed issues around directory handling. Further contributions include adding a missing byte range lock constant, implementing a `realpath` function, and integrating various test improvements. The user's work also involves the integration of host key callback functionality.
sftpsshgo
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