Fiona Liao
Senior Software Engineer II at Grafana Labs
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolFiona Liao is a Senior Software Engineer with 10 years’ experience designing and operating high-performance, multi-tenant observability systems and large-scale data pipelines. Based in London, she has driven query and ingestion work at Grafana Labs—leading the Query squad—and contributed substantive backend and DevOps improvements to flagship open-source projects including Prometheus and Grafana Mimir. Her work spans parsing and histogram handling to per-tenant overrides and Helm chart changes, reflecting deep expertise in time-series data correctness and production reliability. Earlier at Amazon she led data ingestion and knowledge-graph projects for Alexa, combining large-scale ETL, security reviews and mentoring. Known for pragmatic refactors and targeted benchmarks, she brings both hands-on systems engineering and a tested record of improving observability at scale.
10 years of coding experience
6 years of employment as a software developer
Master of Engineering (MEng), Computing, First-Class Honours, Master of Engineering (MEng), Computing, First-Class Honours at Imperial College LondonHigh School, High School at The Tiffin Girls' School
Chinese, English
Github Skills (29)
timeseries-database10
observability10
expressions10
testing10
configuration-management10
graphite10
carbon-copy10
data-structure10
carbon-lang10
prometheus10
go10
expression10
parsing10
parse10
data-structures10
Programming languages (7)
Github contributions (5)
grafana/mimir
Feb 2023 - Mar 2025
Grafana Mimir provides horizontally scalable, highly available, multi-tenant, long-term storage for Prometheus.
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:32 reviews, 7 PRs, 103 pushes in 2 years 1 month
Contributions summary:Fiona contributed to the backend functionality of Grafana Mimir by implementing per-tenant overrides for query ingesters, enhancing the system's multi-tenancy capabilities. They also worked on Helm chart modifications, specifically removing the graphite-web component from the graphite proxy configuration. Furthermore, the user added support for ingesting out-of-order native histograms. These contributions indicate a focus on system performance, configuration, and data handling within the observability domain.
tenantobservabilitygrafanaprometheusstorage
grafana/carbon-relay-ng
Feb 2022 - Feb 2022
Fast carbon relay+aggregator with admin interfaces for making changes online - production ready
Role in this project:Back-end Developer
Back-end DeveloperContributions:10 reviews, 14 commits, 16 PRs in 13 days
Contributions summary:Fiona primarily focused on enhancing the Grafana Carbon Relay NG project's functionality and configuration. They refactored code to make arguments optional, updated configuration files, and refactored the `grafanaNet` configuration options. The user also updated the project's dependencies and jsonnet files, and updated tests to reflect the changes to the `grafanaNet` configuration.
relayadminproduction-readygraphiteinterfaces
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.