Cron's minimum interval is one minute. Here are five production-tested workarounds for running jobs every 30 seconds — from sleep hacks to systemd timers, inotify, and managed schedulers.
A complete technical guide to webhook architecture: data flow, delivery semantics, signature verification, async processing, idempotency, and debugging — with Node.js and Python code examples.
The most common cron job mistakes that cause outages, data loss, and silent failures in production. Learn what to avoid and how to fix each anti-pattern with practical examples.
Webhooks deliver events via HTTP callbacks. WebSockets maintain persistent bidirectional connections. Learn the architecture, trade-offs, and practical decision framework for choosing between them.
A practical guide to production-grade cron jobs. Covers structured logging, file locking with flock, timeouts, signal handling, heartbeat monitoring, error handling, idempotency, and environment isolation.
Cron evaluates schedules against the system clock, which causes timezone-related bugs that are hard to diagnose. Learn how CRON_TZ works, how to avoid DST pitfalls, and how cloud schedulers handle timezone configuration.
A scannable cron syntax reference covering all five fields, operators, special strings, field interaction gotchas, and non-standard extensions for Quartz, Spring, AWS, and Kubernetes.
A hands-on guide to the crontab command: editing, listing, and removing cron jobs, the five-field syntax, system crontabs vs user crontabs, real examples, and common pitfalls that cause silent failures.
APIs let you request data on demand. Webhooks push data when events happen. Learn how they differ in data flow, who initiates the connection, when to use each, and how they work together in production systems — with code examples.
Your cron job isn't running and you don't know why. Walk through the 9 most common causes — from daemon issues to % escaping to timezone mismatches — with concrete fixes for each.
Webhooks push data when events happen. Polling pulls data on a schedule. Learn when each pattern fits, see real code examples and efficiency numbers, and understand how to combine both for maximum reliability.
Learn how to schedule AWS Lambda functions with EventBridge, SAM, CDK, Terraform, and Serverless Framework. Covers IAM, retries, monitoring, error handling, and when to use an external scheduler instead.
Testing webhooks on localhost is tricky because external services can't reach your machine. Learn proven methods — from ngrok tunnels to VS Code port forwarding to provider CLIs — with step-by-step setup guides and code examples.
Webhook deliveries fail. Learn how to build reliable retry logic with exponential backoff, jitter, circuit breakers, and dead letter queues — with code examples, real-world retry schedules from Stripe, GitHub, and Shopify, and a complete implementation guide.
Learn what cron jobs are, how they work, when to use them, and how to set one up. A practical introduction for developers who need to run tasks on a schedule.
Webhook endpoints are public URLs that accept POST requests — a tempting target. Learn how to verify signatures, validate payloads, prevent SSRF, and protect against common attacks with code examples in Node.js, PHP, and Python.
A developer-friendly reference of 25 common cron expressions — from every minute to complex schedules. Copy, paste, and ship.
Cron jobs fail silently by default. Learn how to add monitoring, failure alerts, and recovery notifications to your scheduled jobs.
Copy-pasteable retry implementations in JavaScript, Python, and PHP. Covers exponential backoff, jitter, error classification, Retry-After headers, and production-ready retry libraries.
Serverless platforms don't have crontab. Here's how to run scheduled tasks when you don't have a persistent server — with full implementation examples for Vercel, AWS EventBridge, and external HTTP schedulers.
Learn how to schedule outgoing HTTP requests — from simple cURL cron jobs to managed webhook schedulers with retries and monitoring.