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Jason Y. (dev_in_the_fog)

Full-stack engineer & builder. Creator of NerdKit (global-utils.com), building zero-trust in-browser utilities and deep backend post-mortem playbooks.

Location Seoul, South Korea Joined Joined on  Personal website https://global-utils.com/en

Work

Software Engineer / Creator of NerdKit

Why Clean 48kHz Voice Clips Look Like 128kbps MP3s to Naive FFTs (And How to Fix It in WebAudio)
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Why Clean 48kHz Voice Clips Look Like 128kbps MP3s to Naive FFTs (And How to Fix It in WebAudio)

#computerscience #gamedev #javascript #webdev
1
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7 min read

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Why a '35GB' Quantized LLM Still OOMs an 80GB GPU: KV Cache, GQA vs. DeepSeek MLA, and the Real VRAM Math
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Why a '35GB' Quantized LLM Still OOMs an 80GB GPU: KV Cache, GQA vs. DeepSeek MLA, and the Real VRAM Math

#ai #llm #performance
2
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5 min read
Why Passkeys Break in Production: WebAuthn AuthData, CBOR, and the signCount Trap
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Why Passkeys Break in Production: WebAuthn AuthData, CBOR, and the signCount Trap

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5 min read
How a 24MB Sitemap Crashed Our Vercel Build
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How a 24MB Sitemap Crashed Our Vercel Build

#nextjs #seo #vercel #webdev
1
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6 min read
Distributed Transactions in Practice: 2PC vs Saga Orchestration and Compensating Workflows
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Distributed Transactions in Practice: 2PC vs Saga Orchestration and Compensating Workflows

#architecture #microservices #backend #database
2
Comments 7
3 min read
Kubernetes OOMKilled & CrashLoopBackOff: Deep Memory Profiling & cgroup v2 Architecture
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Kubernetes OOMKilled & CrashLoopBackOff: Deep Memory Profiling & cgroup v2 Architecture

#kubernetes #devops #docker #cloud
1
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3 min read
Redis Cache Stampede: Defeating Thundering Herds with Probabilistic Early Expiration (XFetch)
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Redis Cache Stampede: Defeating Thundering Herds with Probabilistic Early Expiration (XFetch)

#redis #backend #performance #architecture
3
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3 min read
Kafka Exactly-Once Semantics (EOS): Preventing Idempotent Producer PID Churn and Coordinator Timeouts
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Kafka Exactly-Once Semantics (EOS): Preventing Idempotent Producer PID Churn and Coordinator Timeouts

#kafka #distributed #backend #architecture
1
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2 min read
React 19 useActionState: Preventing SSR State Pollution and Event Listener Memory Leaks
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React 19 useActionState: Preventing SSR State Pollution and Event Listener Memory Leaks

#react #javascript #webdev #architecture
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2 min read
Why I Built 35 Zero-Trust Developer Utilities Running 100% in the Browser
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Why I Built 35 Zero-Trust Developer Utilities Running 100% in the Browser

#webdev #javascript #security #productivity
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3 min read
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