Oleg Zaytsev
Principal Software Engineer at Grafana Labs
Madrid, Community of Madrid, Spain
Summary
🤩
Rockstar🎓
Top SchoolOleg Zaytsev is a Principal Software Engineer based in Madrid with 14 years of experience building high-performance, distributed systems and time-series storage. He currently leads backend work at Grafana Labs, contributing notably to Grafana Mimir and Jsonnet tooling, and has a strong track record improving Prometheus TSDB performance and reliability. Previously he drove backend architecture and platform improvements at Cabify and Tuenti, growing into technical leadership roles. Trained in computational mathematics, he pairs rigorous algorithmic thinking with pragmatic engineering—evident from early hands-on tinkering (installing Windows 95 on a 486 with 4MB RAM) to optimizing memory pools and matcher APIs in production systems. An active open-source contributor, he focuses on performance, observability, and robust error handling across widely used monitoring projects.
14 years of coding experience
10 years of employment as a software developer
Licentiate degree Computational Mathematics, Licentiate degree Computational Mathematics at Universidad Complutense de MadridIES Juan de Padilla
Spanish, Russian, English
Github Skills (35)
json10
kubernetes10
back-end-development10
testing10
configuration-management10
grafana10
go-testing10
rpc10
go10
prometheus10
performance-optimization10
gorilla10
jsonnet10
kubernetes-pods10
golang10
Programming languages (14)
Github contributions (5)
grafana/mimir
Feb 2021 - Jan 2023
Grafana Mimir provides horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:4 releases, 1521 reviews, 265 commits in 1 year 11 months
Contributions summary:Oleg primarily contributed to the core functionalities of the Grafana Mimir project, focusing on improving the efficiency and performance of the codebase. Their work involved adding new functions to access and optimize the cortexpb pool, as well as optimizing the label names API with matchers. The user also contributed to various changes in Prometheus, including upgrading versions and implementing optimizations for the postings for matchers cache and also contributed to the implementation of metrics and internal interfaces.
grafana-mimirmulti-tenantprometheusmetricstsdb
grafana/jsonnet-libs
Jan 2021 - Aug 2022
Grafana Labs' Jsonnet libraries
Role in this project:DevOps Engineer
DevOps EngineerContributions:11 reviews, 22 commits, 44 PRs in 1 year 6 months
Contributions summary:Oleg primarily focused on improving the functionality and configuration of the Jsonnet libraries, specifically for use within Grafana and related tooling. Contributions include enhancing the `nginx-directory` component with configurable content types and addressing sub-filter issues. Additionally, the user made changes to the memcached configuration, allowing for more flexibility in resource requests and CPU configurations. Other contributions include various improvements to the `grafana-builder` directory.
grafanajsonnetmonorepoobservabilityprometheus
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