The promotion to manager is not a promotion to senior engineer plus meetings. It is a different job with a different unit of output, and the first 90 days are where most new EMs quietly break themselves learning that.

How to build Terraform modules that stay maintainable across three years of provider upgrades, refactors, and config drift.

After running hundreds of senior interviews, the signal is rarely about algorithms. It is about judgment, blast radius, and how someone reasons when the problem is underspecified.

Why dual writes to your database and Kafka silently lose events, and how the transactional outbox pattern fixes it in production.

How we built an idempotency layer on Postgres that survives client retries, gateway timeouts, and concurrent requests without double-charging anyone.