Callum Styan
Senior Software Engineer at Coder
Vancouver, British Columbia, Canada
Summary
🤩
Rockstar🎓
Top SchoolCallum Styan is a senior software engineer with 13 years of experience specializing in distributed systems, network protocols, and Golang, based in Vancouver. He has operated and improved high-throughput, multi-tenant systems at Grafana Labs—contributing to Prometheus and Loki—working on features that materially cut resource usage (e.g., Remote Write 2.0) and stabilized HA ingestion across Cortex/Mimir. An active open-source contributor, Callum’s work spans core backend engineering, DevOps, and testing across widely used projects like Prometheus, Loki, and k6, including production migrations handling hundreds of TBs per hour and hundreds of MB/s ingestion rates. He mentors other engineers, has presented at KubeCon and DevOpsDays, and brings practical SRE-style instincts to design and automation. Not obvious from job titles alone: he combines low-level protocol and client-timeout fixes with large-scale systems refactors, showing both attention to edge-case correctness and operational scalability.
13 years of coding experience
10 years of employment as a software developer
British Columbia Institute of Technology (BCIT)
English
Github Skills (46)
monitoring10
kubernetes10
docker10
observability10
api-design10
high-availability10
testing10
loadtest10
http10
distributed-systems10
dockers10
go10
prometheus10
service-discovery10
cloki10
Programming languages (14)
Github contributions (5)
grafana/loki
Apr 2020 - Jan 2023
Like Prometheus, but for logs.
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:573 reviews, 81 commits, 258 PRs in 2 years 9 months
Contributions summary:Callum contributed primarily to the core functionality of Loki, focusing on improvements to log processing and ingestion. They implemented features for the Loki canary, enabling generation of out-of-order log lines, and added a byte stream rate limit to the ingester, improving performance. The user also refactored the lambda-promtail integration, updating the codebase to leverage subscription filters. Furthermore, the user made a number of changes related to dashboards and their display for the system.
logginglokigrafanaprometheuscloudnative
prometheus/prometheus
Aug 2017 - Dec 2021
The Prometheus monitoring system and time series database.
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 release, 369 reviews, 107 commits in 4 years 4 months
Contributions summary:Callum contributed primarily to the Prometheus monitoring system's backend, with a focus on enhancing service discovery and database functionality. Their work includes implementing timeouts for the HTTP client used in Consul service discovery and resolving issues related to duplicate or out-of-order samples. The user also added and utilized test utilities, and contributed to database testing and snapshotting functionality. These contributions demonstrate a strong understanding of Prometheus's core components and its interaction with external services.
time-series-databaseprometheus-exporterseries-databasealertingdatabase
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