Some code teaches you an algorithm. Some code teaches you a way of thinking. The snippets below are in the
Continue readingFive Code Gems From Quake, Redis, Linux, Python, and SQLite — and What They Teach
Every analytics dashboard has one question that looks trivial and isn’t: how many unique users did this? You can run
Continue readingHyperLogLog: Counting a Billion Uniques in 1.5 KB of Memory
Getting a request into your system is the easy part. The hard question arrives at hop two: when the order
You hit “Place Order,” the spinner hangs for ten seconds, and you tap the button again. Now the fear sets
Continue readingIdempotency Keys Done Right: Building Retry-Safe APIs That Never Double-Charge
Most developers treat the garbage collector as weather: it happens to them, and occasionally it ruins their day. But the
Every PostgreSQL developer knows the four isolation levels from the SQL standard: Read Uncommitted, Read Committed, Repeatable Read, Serializable. Fewer
Continue readingPostgreSQL Isolation Levels: What Repeatable Read Actually Guarantees
DeepSeeded? No — DeepSeek. In September 2026 the Chinese AI lab released a paper titled “DeepSeek-V4.1-Flash: Pushing the Limits of
September 2026 has been one of the densest months for AI releases in recent memory. Within the first 72 hours,
Here is a failure mode that shows up in every system with more than two backends: round robin distributes requests
Continue readingLoad Balancing Beyond Round Robin: Least Outstanding Requests and Consistent Hashing
Serving a large language model to thousands of concurrent users is, underneath all the marketing, a memory management problem. Every
Continue readingDeepSeek-V4.1-Flash: Why the Most Interesting AI Paper This Month Is About Storage