4 Agent Skills for backend engineers: design review, zero-downtime migration, production GenAI, forecasting

Automated excerpt

Point it at a design doc or PR and it reviews for the failure modes that cause real incidents: retries without idempotency, retry storms with no circuit breaker, missing backpressure, cross-store write drift, hot partitions, and missing golden-signal observability. It also reviews someone else's migration plan for one-way steps and missing rollbacks. This skill catches data leakage, random-fold validation (instead of rolling-origin backtests), missing naive baselines, mishandled seasonality and known-future covariates, the wrong error metric (MAPE near zeros), and no online accuracy monitoring.

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