/Engineering
One vocabulary behind many vendors
Every provider named the same thing differently. The fix was not to remember all their names, but to stop letting any of them into the rest of the code.
// writing
From the workshop
Page 5 of 8
/EngineeringA zero-dependency edge backend
I skipped the official SDKs and called the payment and email APIs with raw fetch. The saving was real. So was the new pile of things I now owned.
/EngineeringSync cursors expire, and so does the empty window
An incremental sync that ran clean for weeks, then reprocessed the same empty window forever. Two non-obvious failures in one cursor, and how each one gets designed for.
/EngineeringOne process, eleven workers: how a heavy render starved the cheap jobs
Eleven queue workers shared one event loop. A GPU render on defaults (concurrency 1, no retries) starved the cheap jobs, and Redis filled up forever.
/EngineeringThe fake test database taxes your real types
Tests ran on in-memory SQLite, prod ran on Postgres with a vector column that SQLite has never heard of. Keeping the tests green quietly threw away the index I was paying for.
/EngineeringMiddleware order is correctness
Auth ran before the rate limiter, and that order was load-bearing. Swap the two lines and every user behind one office router starts colliding.
/EngineeringEnvelope encryption without a big-bang migration
How a nullable key-id column let me roll out per-user envelope encryption alongside old rows, and why every secret leaves the server as a boolean.
/EngineeringA long job behind a sync request: why the socket died at 60 seconds
A media pipeline did three heavy stages inside one HTTP POST. The caller held the socket open for minutes, then got ECONNRESET instead of a result.
/EngineeringNever trust the client's price
The browser cart is a request for a price, not a source of truth. Here is how I stopped treating it like one on a Stripe checkout.
/EngineeringAn error taxonomy across the wire
Every endpoint turned every failure into the same 500 with a stringified message, and the retry layer had no way to tell a blip from a dead end.