From 245 Peak-Time Pods to Around 100: Halving Go Server CPU with DynamoDB SDK v2
Finding a reflection bottleneck with Pyroscope and moving to guregu/dynamo v2: 59% less CPU per request and roughly half as many HPA pods.
Systems at scale
Performance, infrastructure and the decisions behind reliable services.
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What Filled Our MemoryDB? Part 1: Client-Side Caching and Tracking Items
An investigation that began with an 85% memory alert, traced 57 million unidentified objects, and ultimately found the real cause: ghost keys.
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Browse all 104 piecesWhat Was Filling Up MemoryDB? — Part 2
Hello, I’m Simon (Sangwon Lee), a server engineer on the allocation systems team. This is part two of “What Was Filling Up MemoryDB?” Part one followed our investigation into what…
Go embed: Reducing Unnecessary Memory Use with Minimal Changes
Comparing mmap and direct embedding to remove the GeoIP database heap copy found with Pyroscope, reducing unnecessary memory use without changing deployment.
Redesigning Business Systems with AI: Building a CRM to Replace Salesforce
How we built BuzzForce, our in-house replacement for Salesforce: understanding workflows, redesigning the data model, dividing work with AI agents, and moving real business operations into the new system.
Improving Feature Flag API p99 Latency—and Contributing the Fix Upstream
Tracing p99 spikes caused by synchronous go-feature-flag flushes holding a mutex during S3 uploads and jitter sleeps, then fixing them with AsyncExporter and an upstream PR.
How a DynamoDB Limit Setting Cut RCU Consumption by 97%
Hello, I’m Jed from Buzzvil’s Supply Platform team. Low latency and high availability matter when handling large volumes of traffic. That is why we make extensive use of DynamoDB a…
Cutting Python 2.7 CI Time from 13 Minutes to 3
Introduction Hello, I’m Elric from the Supply group’s Product Backend team. Honeyscreen frequently deploys new promotions, but its long CI pipeline—about thirteen minutes—had becom…
Behind BuzzBenefit: The Backend Team Serving Korea’s Five Leading Financial Institutions
Hello, I'm Wynn, lead of the Product Backend team in Buzzvil's Supply group. We're currently looking for a new teammate to help us grow. A job posting can only tell you so much abo…
AWS Cost Optimization, Part 1: How Buzzvil Saved Over KRW 100 Million a Month
During 2023, Buzzvil reduced AWS costs by approximately KRW 120 million per month, equivalent to around KRW 1.4 billion annually. In this series, we share the experience and practi…