How to write an effective software design document

How to write an effective software design document
20 minutes by Michael Lynch

A design doc helps teams avoid costly mistakes by forcing careful thinking before writing code. Michael suggests focusing the doc on decisions that are hard to reverse, and skipping trivial choices that are easy to fix later. Key sections include goals, constraints, interfaces, security, and open issues. The right length depends on project complexity, team size, and risk.

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How one connection kills a database
5 minutes by Simeon Griggs

A single unhandled exception can freeze an entire database. When a transaction never commits, it holds a lock that blocks migrations, and those migrations block every new query behind them. PlanetScale now lets you view and kill stuck connections through a dashboard or CLI, even when your database is out of connection slots, using a reserved admin connection.

On solving the Jane Street reverse engineering challenge
18 minutes by Jestoph

Jestoph takes on Jane Street's chip reverse engineering challenge, spending a month figuring out what a mystery computer chip does by analyzing its design files. The process involved building several unnecessary tools from scratch, finding an actual bug in the puzzle, and eventually using a constraint solver to work out the correct 120-bit input. After finally combining everything, the circuit revealed its secret answer.

We are all product engineers now
22 minutes by Laurie Voss

AI is rapidly collapsing the cost of writing and reviewing code, shifting what software developers actually do. The work that remains, understanding what people want and defining it precisely, cannot be automated because it lives in customers' heads, not in training data. This role already has a name and a market: product engineering, paying around $240,000.

The git history command deserves more attention
5 minutes by Lalit Maganti

Git 2.54 and 2.55 added a new git history command with three subcommands: fixup, reword, and split. These let you cleanly edit old commits and automatically update all branches built on top, without leaving your repo in a broken state. It does not fully replace tools like jj, which handles conflicts more gracefully, but it brings some of the same benefits without switching tools.

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And the most popular article from the last issue was:

• How to name things