@gitgoodordietrying

dns-networking covers dns query patterns, port connectivity testing, firewall rule inspection, curl diagnostics with timing breakdown, /etc/hosts configuration, and certificate validation. includes practical scripts and multi-platform command variants.

cron-scheduling covers cron syntax, crontab management, systemd timers, one-off scheduling with at and sleep, timezone handling including DST pitfalls, and debugging patterns with concrete examples for monitoring and preventing job overlap.

Write and run tests across languages and frameworks. Use when setting up test suites, writing unit/integration/E2E tests, measuring coverage, mocking dependencies, or debugging test failures. Covers Node.js (Jest/Vitest), Python (pytest), Go, Rust, and Bash.

Profile and optimize application performance. Use when diagnosing slow code, measuring CPU/memory usage, generating flame graphs, benchmarking functions, load testing APIs, finding memory leaks, or optimizing database queries.