Technical deep dives on building developer tools, API design, and shipping products. From the team behind Anethoth.
A step-by-step guide to building a production-ready PDF invoice generation API using Python, FastAPI, and WeasyPrint. Complete with templates, validation, and Stripe billing.
Why your cron jobs fail silently, how dead man's switch monitoring works, and how to set up reliable alerting for every scheduled task in your infrastructure.
How to implement feature flags without LaunchDarkly's price tag. Practical patterns for progressive rollouts, A/B testing, and kill switches that every startup should use.
Everything you need to know about debugging webhook integrations — from capturing payloads to replaying failed deliveries. Covers Stripe, GitHub, Shopify, and more.
Stop manually creating invoices. Learn how to automate PDF invoice generation with an API — from Stripe payment events to sending professional invoices automatically.
Common crontab pitfalls that cause silent failures in production — from timezone confusion to overlapping jobs. Practical fixes for every mistake.
How to use feature flags for canary deployments, percentage rollouts, and targeted releases. A practical guide to shipping confidently with real-world examples.
Everything you need to handle Stripe webhooks correctly — signature verification, event types, idempotency, error handling, and testing with real payloads.
A free, no-signup HTML to PDF conversion API. Send HTML, get a PDF back. Supports custom page sizes, CSS styling, and Markdown input. Built for developers who need quick document generation.
A free REST API that parses cron expressions into human-readable descriptions, validates syntax, and calculates upcoming execution times. No signup required — just send a GET request.
A free HTTP echo API that mirrors any request back as JSON — method, headers, body, IP. Debug webhooks, test HTTP clients, and inspect headers without installing anything.
A free API to evaluate feature flag targeting rules, simulate percentage rollouts across users, and test consistent hashing bucketing. No signup — experiment with feature flags instantly.
Everything we write about, we ship. Try our developer tools with generous free tiers.