Engineering Insights

Production backend lessons from incidents, debugging, architecture trade-offs, and performance work for Java and Spring engineers.

Spring Boot Did Not Leak Memory. Redis Had No Exit

Redis memory kept growing in Spring Boot because cache keys had no TTL, maxmemory, eviction policy, or namespace-level monitoring.

A production-style Java file handling lesson about Files.move(), reused filenames, race conditions, and safer file lifecycle design.

Backend reporting lesson on summary tables, mutable transactions, report snapshots, data lineage, and reproducible monthly totals.

A production lesson on reporting database migrations, historical data paths, and checks that prevent broken monthly reports today.

Learn how to build trusted report automation with data readiness, reconciliation, audit trails, and verification.

Learn how a shared Kafka consumer group ID caused rebalancing issues across environments and how to prevent it.

Learn why Spring Boot Kafka consumers generate duplicate reports and how acknowledgments, retries, leases, and idempotency fix it.