User-scoped caching with TTLs, mutation-driven invalidation, rule-based budgets, Render deployment with health checks, and unambiguous mobile handoff.
Separate income/expense LightGBM regressors, time-aware features, walk-forward validation, and 80% confidence intervals make cash-flow projections actionable.
A hybrid categorization system with rule-based fallback, LightGBM classifier, and confidence-gated ML predictions—ensuring sensible behavior from day one.
A four-phase migration from local JWT to Supabase Auth with reversible migrations, additive verification, and 82 integration tests passing throughout.
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.
Explains CPU and device concurrency, interrupts and traps, bootstrapping, I/O flow, and storage hierarchy basics.