Arc Notes Weekly #108: What’s Worth Building
Cheaper intelligence, faster interfaces, and the judgment needed to turn agent work into useful software.
3 min read
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Architecture Notes
Newsletter by Mahdi Yusuf
Weekly notes on software architecture and building products.
2 posts in the last 90 days · newest 4 Oct
Arc Notes Weekly #107: Closing the Loop
Cloudflare’s 100TB RAM saving, faster Postgres analytics, and keeping humans in the loop as agents take on more work.
3 min read
Arc Notes Weekly #106: Arrowhead
This week, Amazon tightened review after a nearly six-hour retail outage and a 13-hour AWS incident tied to AI-written code, while Stripe's 11-task benchmark showed Claude Opus 4.5 hitting 92% on task
5 min read
Arc Notes Weekly #105: Enforce
This week, why LLM-generated code can pass tests yet fail on performance, how a GitHub issue title triggered a supply-chain breach on 4,000 machines, and why verification hasn't caught up with AI code
4 min read
Arc Notes Weekly #104: Telluride
This week, Bloom filters slash API latency 16×, MAKER cracks a million-step task with zero errors using agent voting, and incremental architecture shows why small shifts beat big-bang rewrites always.
3 min read
Arc Notes Weekly #103: Trio
This week, why pgvector might not cut it in production, how bloom filters fail at scale, and why LLMs can't replace hands-on learning. Plus, slashing cloud costs and Postgres as a lakehouse system.
4 min read
Arc Notes Weekly #102: Primetime
This week, saving $1.2M by leaving AWS for bare metal, why Postgres replaces Kafka more often than you think, and a cautionary startup infrastructure tale. Plus, AI debugging and SQLite concurrency.
3 min read
Arc Notes Weekly #101: Generator
This week, how AWS hits 1 petabyte per second on old HDDs, why a DNS bug killed Slack for 14 hours, and how to build a key-value database from scratch.
4 min read