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Long-form notes on software, distributed systems, and the craft of building. Shipping one a week.

All AI Backend Distributed Systems Engineering Research

1 post · Backend

May 19, 2026Backend

Durable Execution Isn't About Agents — It's About Replayable Backend Workflows

I came to durable-execution runtimes through the agent press, but the constraint that surprises everyone is determinism on replay. These are my notes from working a six-step payment reconciliation as a Restate workflow in TypeScript — the line that broke replay, the mental model that fixed it, and the trade-offs that come with the pattern.

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