https://daviddacruz.dev/ 2026-04-23 weekly 1.0 https://daviddacruz.dev/david-dacruz.webp David Dacruz — AI advisory, Bitcoin dev, Ericeira Portugal David Dacruz, independent senior engineer for AI advisory, practical AI builds, and selective Bitcoin work from Ericeira, Portugal. 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Ericeira, Portugal https://daviddacruz.dev/blog https://daviddacruz.dev/news 2026-04-23 daily 0.7 https://daviddacruz.dev/about 2026-04-23 monthly 0.8 https://daviddacruz.dev/david-dacruz.webp David Dacruz — 42 School Alumni, Bitcoin Dev, AI Builder David Dacruz in Ericeira, Portugal. 42 School Paris alumnus. Dev team behind Pizza Ninjas and Pizza Pets. Ericeira, Portugal https://daviddacruz.dev/about https://daviddacruz.dev/david-early-days.webp David Dacruz — early career David Dacruz in the early days of his career, before 42 Paris. https://daviddacruz.dev/about https://daviddacruz.dev/42-paris-david.webp David Dacruz at 42 Paris David Dacruz during his time at 42 School Paris. Paris, France https://daviddacruz.dev/about https://daviddacruz.dev/42-lisboa-founding-team.webp 42 Lisboa founding team The 42 Lisboa founding team — David Dacruz helped launch the Portugal campus. Lisboa, Portugal https://daviddacruz.dev/about https://daviddacruz.dev/projects 2026-04-23 weekly 0.8 https://daviddacruz.dev/screenshot-ericeira-review.webp Ericeira Review — Local Guide Website Screenshot of Ericeira Review, the insider guide to Ericeira, Portugal. Ericeira, Portugal https://ericeirareview.com https://daviddacruz.dev/screenshot-jurassic-barks.webp Jurassic Barks — Dog Daycare in Ericeira Screenshot of Jurassic Barks, family-style dog daycare and boarding. Ericeira, Portugal https://jurassicbarks.dog https://daviddacruz.dev/screenshot-lets-paws.webp Let's Paws Together — Dog walking community Screenshot of Let's Paws Together, dog walking community in Ericeira. 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USD Pricing for AI automation projects in 2026: build costs, monthly API and infrastructure costs, consultant rates, and ROI math in USD. https://daviddacruz.dev/blog/ai-automation-cost-breakdown-2026 https://daviddacruz.dev/blog/ai-automation-for-saas 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/ai-automation-for-saas.png AI Automation for SaaS Companies: 7 Workflows Worth Building Specific AI automations for SaaS teams: support triage, churn detection, onboarding personalisation, and expansion signals, with build costs and production examples. https://daviddacruz.dev/blog/ai-automation-for-saas https://daviddacruz.dev/blog/negative-seo-what-actually-matters 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/negative-seo-what-actually-matters.png Negative SEO in 2026: What Hurts, What to Ignore A practical breakdown of negative SEO — the seven attack vectors, what Google filters automatically, how to spot a real attack vs normal ranking noise, and the defense stack worth building when you run a site that matters. https://daviddacruz.dev/blog/negative-seo-what-actually-matters https://daviddacruz.dev/blog/context-engineering-skills-over-agent-md 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/context-engineering-skills-over-agent-md.png The 944-Token Mistake: Why Your Agent.md File Is Making Claude Dumber A practical take on context engineering: when CLAUDE.md helps, when it bloats the session, and how skills plus progressive disclosure keep agents sharper. https://daviddacruz.dev/blog/context-engineering-skills-over-agent-md https://daviddacruz.dev/blog/freelancing-in-portugal-honest-guide-2026 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/freelancing-in-portugal-honest-guide-2026.png Freelancing in Portugal in 2026: The Practical Version A first-person account of freelancing as a tech worker in Portugal: the D8 visa, NHR changes, cost of living numbers, client acquisition, and the lonely months. https://daviddacruz.dev/blog/freelancing-in-portugal-honest-guide-2026 https://daviddacruz.dev/blog/building-ericeira-review-in-public 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/building-ericeira-review-in-public.png Building Ericeira Review in Public — Log 01 The first build-in-public log on Ericeira Review. 19 days public: 421 visitors, 1,256 pageviews, 46 five-star reviews, 118 Instagram referrals, 20 countries — all from the database. What's working, what isn't, and what Log 02 covers. https://daviddacruz.dev/blog/building-ericeira-review-in-public https://daviddacruz.dev/blog/agentic-economy-x402-protocol 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/agentic-economy-x402-protocol.png x402 and AI Agent Payments: Why HTTP 402 Matters Again How the x402 protocol lets AI agents make autonomous stablecoin payments, and why machine-to-machine payments matter for builders. https://daviddacruz.dev/blog/agentic-economy-x402-protocol https://daviddacruz.dev/blog/claude-code-skills-agents 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/claude-code-skills-agents.png Claude Code Skills & Agents: Build Custom Slash Commands for Real Work A practical guide to Claude Code skills, custom slash commands, and subagents: how to build reusable AI workflows your team can keep using. https://daviddacruz.dev/blog/claude-code-skills-agents https://daviddacruz.dev/blog/ai-automation-workflows-for-business 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/ai-automation-workflows-for-business.png AI Automations for Business: Where to Start in 2026 A practical guide to AI automations for business: research agents, outreach pipelines, support triage, by-industry and by-function breakdowns, tools, ROI math, and production notes. https://daviddacruz.dev/blog/ai-automation-workflows-for-business https://daviddacruz.dev/blog/seo-complete-guide 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/seo-complete-guide.png SEO in 2026: Technical Setup, Content, and AI Search A practical SEO guide for 2026: technical setup, content strategy, structured data, local SEO, and how AI-powered search changes the work. https://daviddacruz.dev/blog/seo-complete-guide https://daviddacruz.dev/blog/how-to-choose-fractional-cto 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/how-to-choose-fractional-cto.png How to Choose a Fractional CTO (From Someone Who Is One) What to look for in a fractional CTO, when you need one, and how to structure the engagement. Written by a fractional CTO who works with startups and web3 projects. https://daviddacruz.dev/blog/how-to-choose-fractional-cto https://daviddacruz.dev/blog/ai-agents-for-business 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/ai-agents-for-business.png AI Agents for Business: From Demo to Workflow What AI agents are, where they work today, where they still break, and how to implement them in a business workflow. https://daviddacruz.dev/blog/ai-agents-for-business https://daviddacruz.dev/blog/web3-project-launch-checklist 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/web3-project-launch-checklist.png The Web3 Project Launch Checklist: From Idea to Mainnet A practical checklist for launching a web3 project: tokenomics, smart contracts, community, go-to-market, security audits, and the order to handle them. https://daviddacruz.dev/blog/web3-project-launch-checklist https://daviddacruz.dev/blog/what-a-fractional-cto-actually-does-week-by-week 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/what-a-fractional-cto-actually-does-week-by-week.png What a Fractional CTO Does, Week by Week A first-person account of fractional CTO work in practice: decisions, context-switching, code, hiring, stakeholder calls, and the moments when the model stops working. https://daviddacruz.dev/blog/what-a-fractional-cto-actually-does-week-by-week https://daviddacruz.dev/blog/from-web3-to-ai-what-transferred 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/from-web3-to-ai-what-transferred.png From Web3 to AI: What Transferred, What Didn't A personal reflection on four years in Bitcoin and Ordinals development, and what building on-chain taught me about AI-native systems. https://daviddacruz.dev/blog/from-web3-to-ai-what-transferred https://daviddacruz.dev/blog/recursive-ordinals-on-chain-composability 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/recursive-ordinals-on-chain-composability.png Recursive Inscriptions and On-Chain Composability on Bitcoin: A Developer Guide A technical guide for engineers evaluating Bitcoin Ordinals. Covers recursive inscriptions, on-chain composability, game-state coordination, real-world architecture patterns from Pizza Ninjas and Pizza Pets, and tradeoffs vs. EVM/Solana. https://daviddacruz.dev/blog/recursive-ordinals-on-chain-composability https://daviddacruz.dev/blog/how-we-inscribed-1500-ordinals-on-bitcoin 2026-04-22 monthly 0.8 https://daviddacruz.dev/og/how-we-inscribed-1500-ordinals-on-bitcoin.png How We Inscribed 1,500 Ordinals on Bitcoin A technical walkthrough of inscribing the Pizza Ninjas Ordinals collection on Bitcoin in January 2024: tooling, coordination, recursive inscriptions, and what broke. https://daviddacruz.dev/blog/how-we-inscribed-1500-ordinals-on-bitcoin https://daviddacruz.dev/location.kml 2026-04-22 yearly 0.3 https://daviddacruz.dev/llms.txt 2026-04-22 monthly 0.3 https://daviddacruz.dev/llms-full.txt 2026-04-22 monthly 0.3 https://daviddacruz.dev/guides/ai-advisory-call-prep-guide.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/ai-automation-playbook.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/bitcoin-launch-checklist.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/fractional-cto-first-90-days.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/one-day-launch-kit.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/portugal-freelancer-guide.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/technical-seo-compounding-moat.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/web3-project-launch-checklist.pdf 2026-04-22 yearly 0.4 https://daviddacruz.dev/guides/ai-customer-support-guide.pdf 2026-04-22 yearly 0.4