Harry John
Senior Software Engineer at Amazon Web Services (AWS)
Vancouver, British Columbia, Canada
Summary
🤩
Rockstar🎓
Top SchoolHarry John is a Senior Software Engineer with 11 years of experience building scalable, cloud-native observability and security systems, currently at AWS Observability in Vancouver. He has deep backend and DevOps expertise, contributing to high-profile CNCF projects like Thanos and Cortex where he improved query correctness, implemented series limits, and resolved memory and performance issues for long-term Prometheus storage. At AWS he helped build the Managed Service for Prometheus, applying production-grade engineering to multi-tenant, highly available services. His background spans Microsoft and Amazon security services, plus an early entrepreneurial stint as a co-founder, giving him a practical blend of product, operations, and systems design experience. A traveler and writer by inclination, he pairs hands-on distributed systems work with clear communication and a knack for identifying subtle correctness and scalability gaps.
11 years of coding experience
10 years of employment as a software developer
Bachelor of Technology - BTech, Computer Science, Bachelor of Technology - BTech, Computer Science at Amrita Vishwa Vidyapeetham, Coimbatore
English
Stackoverflow
666reputation
69kreached
6answers
20questions
Github Skills (28)
monitoring10
kubernetes10
back-end-development10
go10
prometheus10
api10
kubernetes-pods10
thanos10
devops10
metric10
observability9
apidoc9
distributed-systems9
performance-optimization8
apim8
Programming languages (6)
Github contributions (5)
cortexproject/cortex
Jul 2020 - Jan 2023
A horizontally scalable, highly available, multi-tenant, long term Prometheus.
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:136 reviews, 14 commits, 63 PRs in 2 years 6 months
Contributions summary:Harry primarily focused on enhancing the Cortex project's back-end capabilities and store-gateway functionalities. Their contributions included implementing a new hashing algorithm for user subrings, fixing cache-related metrics, and enabling series limiters in the store-gateway. The user also worked on incorporating series limiters within the distributor's API for series and addressing memory leaks related to cluster labels. Additionally, the user added streaming functionality to ingester metadata APIs, and addressed various bug fixes.
golangscalabletenantprometheus-exporterlong-term
thanos-io/thanos
Feb 2023 - Jan 2025
Highly available Prometheus setup with long term storage capabilities. A CNCF Incubating project.
Role in this project:Back-end Developer
Back-end DeveloperContributions:28 reviews, 18 PRs, 39 comments in 1 year 11 months
Contributions summary:Harry primarily contributed to the Thanos project by addressing issues related to query performance and correctness. Their work involved modifying the query frontend and querier components, specifically focusing on ensuring sorted query results and addressing issues with topk and bottomk functions. They also worked on improving code quality by fixing lint issues and addressing comments on pull requests. Furthermore, they implemented limits in the API for label names, values, and series requests.
promqlobservabilityprometheusstoragegoogle-cloud-storage
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