Article
Same Animation, Different CLS: Exploring Why Transforms Are Excluded
Preserving the goose animation while reducing CLS and browser work, and exploring the reasoning behind excluding transforms from CLS.
Buzzvil Engineering
Articles
Engineering decisions, experiments and lessons from building Buzzvil.
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Article
Finding Constellations in Photos: Building a Plate Solver, Seven Years in the Making
I built a plate solver that looks only at the arrangement of stars in a photo, works out which part of the sky it shows, and draws the constellations. It took three attempts, from a dream in 2019 to finishing it with Claude Code.
Article
What We Learned Applying Preloading to an Ad SDK Without a Preload API
How we separated ad allocation from hidden SDK execution and designed exposure, fallback, and session lifecycles for a recurring ad mission.
Article
Video Optimization Was Never Just About the Video
How we handled delayed and failed video playback in WebViews—and expanded optimization from media files to the entire user experience.
Article
Figma, downsized.
How a shift toward design work in code is changing Buzzvil’s Figma usage, handoffs and tool budget.
Article
What 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…
Article
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.
Article
Designers Open the PRs Now
6 months. 432 pull requests. One design team. What got better, and what it cost us. Recently, one of our designers was exploring a lucky-draw concept in the ad participation flow.…
Article
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.
Article
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.
Article
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.
Article
A Design System for an Agent
As a Frenchman, I love spending time in the kitchen, cooking things for the fam. As a designer, I love crafting delightful interactions. So in the first half of 2026, I spent a cra…