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System Design Simple

System Design Simple. How big apps really work, explained simply: system design, AI tools and security fixes, each with our own lab test and real numbers. New article daily.

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Design Instagram's feed: system design in 5 steps
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Design Instagram's feed: system design in 5 steps

#systemdesign #redis #backend #interview
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25 min read
System design requirements: SLOs, budgets, capacity
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System design requirements: SLOs, budgets, capacity

#systemdesign #sre #architecture #backend
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26 min read
Auto mode is now the default in the Claude apps: what it blocks, how to switch back
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Auto mode is now the default in the Claude apps: what it blocks, how to switch back

#claude #claudecode #ai #permissions
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8 min read
How to create an AI agent skill: one SKILL.md, reused by two agents
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How to create an AI agent skill: one SKILL.md, reused by two agents

#ai #claudecode #codex #agents
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4 min read
KV cache and continuous batching: 1,000 people ask AI
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KV cache and continuous batching: 1,000 people ask AI

#ai #llm #systemdesign #performance
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8 min read
apt CVE-2026-109518: how to check and fix Debian, Ubuntu
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apt CVE-2026-109518: how to check and fix Debian, Ubuntu

#linux #security #devops #ubuntu
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8 min read
Server failover: active-passive vs active-active
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Server failover: active-passive vs active-active

#systemdesign #sre #backend #devops
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8 min read
Is Codex CLI still running after you close it? A 5-minute check
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Is Codex CLI still running after you close it? A 5-minute check

#codex #cli #devtools #terminal
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4 min read
Codex CLI agent command center: what 0.167.0 changes when you run several agents
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Codex CLI agent command center: what 0.167.0 changes when you run several agents

#ai #programming #productivity #tutorial
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5 min read
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