Blog

Technical writing on agentic engineering, AI workflows, and shipping production products with Claude Code.

• Apr 25, 2026· 7 minSEOPythonAutomation

  DataForSEO + Python: automated SEO audit for Vercel projects

  I built a Python module that runs SEO audits on Vercel-deployed projects via DataForSEO API. 574 keywords, 306 prioritized opportunities, 78% cache hit. Real code, outputs and lessons.

• Apr 20, 2026· 6 minnextjsi18nlocalization

  Multi-language sites in Next.js 16: next-intl, hreflang, localizing ticketing flows

  How I built the DJ BOBO Arena Tour sites for CZ and PL - single codebase, two deploys, localized cities and ticketing vendors. next-intl config, hreflang, locale routing, ticketing flow.

• Apr 15, 2026· 6 minAIVercelArchitecture

  Vercel AI Gateway: why I stopped calling the Anthropic SDK directly

  I switched production calls from @ai-sdk/anthropic to model strings via Vercel AI Gateway. Provider-agnostic fallback, OIDC auth without API keys, $5/day cap. Before/after streamText snippets.

• Apr 8, 2026· 8 minBackendIntegrationsB2B

  WhatsApp Business API for B2B: webhook handler + Stripe sync

  Real WhatsApp Business API setup for Maruška - Meta verification, HMAC SHA-256, idempotency, 5-min TTL media download, Stripe customer.metadata.whatsapp_phone trick. TypeScript code.

• Apr 1, 2026· 8 minb2bdata-pipelinebun

  B2B lead pipeline: Bun + SQLite + Playwright (100K+ companies in a weekend)

  The Krtek pipeline from scratch - pulling the CSO RES dump, NACE filtering, ARES enrichment, Playwright scraping. Bun + bun:sqlite as the batch engine. Code, schema, NACE strategy.

• Mar 28, 2026· 9 minDatabaseArchitectureSaaS

  Multi-tenant Postgres for SaaS: row-level security with Prisma

  How SME Financial OS isolates client data via Postgres RLS + Prisma middleware. SET app.current_org_id per request, ~5% overhead, demo mode via read-only policy. SQL + TS code.

• Mar 15, 2026· 7 minclaude-codeworkflowautonomous-agents

  Claude Code workflow: how to set up an autonomous dev loop

  How I use Claude Code as my primary dev tool - Ralph autonomous loop, custom memory, CLAUDE.md instructions, and hooks. The real setup that shipped DokladBot in 6 days.

• Mar 12, 2026· 6 minPaymentsSaaSStripe

  Stripe Checkout vs Subscriptions: when to use which mode

  Real comparison across three projects - Maruška (subs 399/599/799 CZK), Holky s úspěchem (one-shot 990 CZK), DokladBot (199 CZK/mo). Conversion 4.7% vs 2.1%, dunning, portal, webhooks.