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bitchat Architecture: How Do You Deliver a Message With No Internet and No Radio Range?

bitchat is a P2P messenger with no accounts and no servers. Nearby devices form a BLE mesh; distant peers are reached over Nostr. The center of this piece is the four-layer store-and-forward stack that answers "the recipient is not here right now" — a sealed outbox, courier envelopes addressed by nothing but an HMAC tag plus spray-and-wait, GCS-filter public history sync, and Nostr mailboxes — traced through the code.

bitchat bluetooth-mesh nostr noise-protocol p2p store-and-forward swift architecture

2026년 7월 25일

Hallmark Architecture: How Do You Stop Designs From Looking 'AI-Generated' — With a Prompt?

Hallmark is Together AI’s anti-AI-slop design skill. It ships almost no executable code — its entire intelligence lives in 106 markdown files. This piece dissects the SKILL.md router and its progressive context loading, the narrowing decision pipeline, and — at its center — the 58 slop-test gates, contrasting it with skill-injecting projects like Superpowers and SkillSpector.

hallmark prompt-engineering ai-agent skills design claude-code llm architecture

2026년 7월 24일

Llama 3 (2024) Paper Notes

Paper notes on The Llama 3 Herd of Models: 15T tokens, a 405B flagship, 128K context, and a design philosophy of 'managing complexity' (dense over MoE, SFT → rejection sampling → DPO instead of PPO) — the paper where an open-weight model first reaches GPT-4-class performance. It completes Llama 2's skeleton through scale, data, and simplicity.

llm paper-reading transformer llama-3 dpo alignment open-source meta

2026년 7월 24일

Llama 2 (2023) Paper Notes

Paper notes on Llama 2 covering its commercial license, a base model scaled to 2T tokens with 4k context and GQA, and the Llama 2-Chat alignment pipeline (SFT → two reward models → iterative RLHF with rejection sampling + PPO → GAtt). It fuses LLaMA's open base lineage with InstructGPT's RLHF at production quality.

llm paper-reading transformer llama-2 rlhf alignment open-source meta

2026년 7월 13일

Analyzing Floci: What Does It Take to Fit 68 AWS Services Into One Container?

Floci is an always-free, open-source local AWS emulator with no account, no auth token, and no feature gates. A single Quarkus + GraalVM native container emulates 68 AWS services behind one port, 4566. We analyze its Smithy-spec protocol routing, descriptor-driven service catalog, four storage modes, and real Docker execution — against LocalStack.

floci localstack aws quarkus graalvm testing backend architecture

2026년 7월 10일