Schema migrations evolve database structure safely. I use migration tools like Flyway, Liquibase, or framework migrations. Version-controlled migrations track schema changes. Up migrations apply changes, down migrations revert. Idempotent migrations c

DAST is useful when it is fast enough to run regularly and scoped enough to avoid chaos. I use baseline scans on pull request environments to catch missing headers, obvious injection risk, and regressions in exposed attack surface. It is not a substit

GitHub Actions automates build, test, and deploy workflows. Workflows are defined in .github/workflows/ YAML files. The on key specifies triggers—push, pull_request, schedule, or workflow_dispatch. Jobs run on runners with configurable OS. steps execu

Resilience4j provides resilience patterns for fault tolerance. Circuit breakers prevent cascading failures—open after threshold failures, allow retry after timeout. Rate limiters control request rates. Retry mechanisms handle transient failures. Bulkh

A lot of machine learning reduces to linear algebra with better tooling. Dot products, norms, matrix multiplication, and projections show up in recommendation, embeddings, PCA, and optimization. I keep the implementation small and testable so it stays

Pagination divides large datasets into pages, improving performance and UX. Eloquent's paginate() method returns a paginator with data and metadata. The links() method renders pagination UI. I customize per-page counts with paginate(50). Simple pagina