He Rewrote Everything in Rust — Then We Got Fired
The day his code hit production, the graphs went flat. A month later, HR called us in. ThreadSafe Diaries 4 min read · Jun 12, 2025 -- 65 Share
Before the Rewrite, We Were Drowning
We were a team of six. Backend engineers juggling microservices, pipelines, devops patches, and postmortems that read like therapy notes.
Our stack was typical for a fast-moving startup:
Node.js microservices
Redis queues
AWS Lambdas
MongoDB for almost everything
We weren’t bad. We just weren’t fast. Services were functional, but brittle.
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