#Data Engineering

Shipping Analytics Safely: Caching, Budgets, Deployment, and Handoff

User-scoped caching with TTLs, mutation-driven invalidation, rule-based budgets, Render deployment with health checks, and unambiguous mobile handoff.

September 12, 2026 5 min read

Making a Personal-Finance API Trustworthy: Tests, Isolation, and Balance Accounting

How to build an API that guarantees correct account balances, strict user isolation, and consistent analytics through isolated integration tests, immutable transaction rules, and cache invalidation.

September 8, 2026 5 min read