ARPU, churn, margin, LTV and CAC: how to model SaaS economics at the idea stage, which assumptions to test first and how the numbers shape your backlog.
Caches live in the browser, on a CDN, in the application and in the database. We cover Cache-Control headers, invalidation strategies, stampede protection and common mistakes.
Redis speeds up caching, sessions, queues and rate limits, but it does not replace your database. We cover use cases, memory settings and when you do not need it.
TypeScript pays off in any project developed for more than a few months. We cover the benefits, the cost of switching and a plan for gradual migration.
A technical SEO checklist before release: robots.txt and sitemap, redirects, canonical and hreflang, server rendering, metadata, speed and the first weeks after launch.
RAG lets an assistant answer from your knowledge base without fine-tuning. We cover the components, a Python example with pgvector and why answers go wrong.
Read a quote from the scope, not the total. We show how to check the breakdown, rates and buffer, spot an underpriced quote and what to ask the vendor.