Programming
Next.js 16: The 7 Features That Change How We Build Production Apps
Next.js 16 introduces partial prerendering, async caching, and build improvements that cut deploy time up to 40%. Here's everything you need to migrate.
·1 min read
Blog
Articles on programming, AI agents, online business and entrepreneurial mindset. All from the trenches, building real products.
Business
How to Buy an Online Business: The Practical Guide for Entrepreneurs
Most entrepreneurs build from scratch when they could buy profitable digital assets for €3,000-€15,000. Learn how to evaluate, negotiate, and automate an existing online business without losing money in the process.
·1 min read
Programming
Supabase vs Firebase 2026: The Decision That Will Multiply Your Deploy Speed
Firebase dominated for years. But in 2026, Supabase flipped the script with native PostgreSQL databases, predictable pricing, and real control over your data. Discover why Spanish developers are choosing Supabase for products that scale without billing surprises.
·1 min read
Programming
Late API: Why Most Developers Build APIs Backwards
Most developers design APIs by guessing what their clients will need. It's backwards. Late API flips this: you build the API after you know exactly what's needed, not before. Here's how to implement it in production.
·1 min read
Business
Bootstrap Startup Without Funding vs VC: What Actually Works in 2026
Most founders think you can't scale without VC funding. Wrong. Bootstrapped startups generate more revenue per founder, control their destiny, and reach profitability 3–4x faster. We show you when each model works and how to choose yours.
·1 min read
Programming
How to Build AI Agents in 2026: From Concept to Production
AI agents aren't the future. They're the present, and they're eating the jobs of those who don't act. In 2026, building a working AI agent is more accessible than ever, but most developers are still stuck in simple chatbots. Learn to build real agents that make decisions, execute complex tasks, and generate recurring revenue—with code you can deploy today.
·1 min read
Business
Monetization Strategies: How to Build a Passive Income Online Business in 2026
Most developers believe passive income requires a perfect product. Discover why 73% of successful founders monetize before they finish. Proven strategies: micro-SaaS, AI automation, and community monetization. Learn to generate €12K-€30K/month from day one.
·1 min read
Programming
Model Context Protocol Guide: How to Build Claude Integrations That Actually Scale
MCP (Model Context Protocol) lets you connect Claude to your tools, databases, and APIs without rebuilding integrations every time. Learn how to implement it in production, avoid common mistakes, and why it's the foundation of enterprise AI agents in 2026.
·1 min read
Programming
Claude Agent SDK: Build Autonomous AI Agents for Production
Claude Agent SDK lets you build autonomous AI agents that execute complex tasks without human intervention. Learn how to implement it, avoid common integration mistakes, and deploy your first production agent in under 48 hours.
·1 min read
Business
RaaS: The Productized Services Business Model Replacing Traditional SaaS
RaaS and productized services models are dismantling traditional SaaS subscription economics. Learn how to structure, scale, and monetize without perpetual monthly subscriptions. Real examples and battle-tested architecture included.
·1 min read
Business
How to Build a SaaS Product in 2026: The No-BS Guide for Developers
Most developers fail building SaaS because they think the product is the business. It's not. Learn the technical stack, real validation, and how to launch without external funding.
·1 min read
Programming
Claude Code 2026: Prototype to Production in 48 Hours
Claude Code isn't a chatbot. It's an autonomous agent that reads code, writes tests, refactors legacy systems, and deploys to production. Learn how to use it correctly to reduce development time by 70% and avoid the 5 mistakes 9 out of 10 developers make.
·1 min read
Business
How to Validate Your Startup Idea in 2026: The Real Method That Works
Validation isn't a survey. It's real money, real users, and real rejections. Learn how to know in 6 weeks if your idea has traction without burning 10,000 € in development.
·1 min read
Programming
Claude Code Tutorial 2026: Prototype to Production in 48-Hour Sprints
Claude Code isn't a generic coding assistant. It's an engineering agent that refactors, deploys, and debugs real code in production. Learn to implement it as a workflow tool, not a prototyping toy.
·1 min read
Programming
Apify: Web Scraping & RPA Automation in 2026
Apify is the platform 4,000+ developers use to automate web scraping and RPA without complex coding. We show you how to implement it in production, when to use it vs alternatives, and why most teams are ignoring its integration potential with AI agents.
·1 min read
Business
Validating Your Startup Idea in 2026: Real Methods That Work
Most startups fail because founders never validated whether anyone would actually pay for their solution. Learn the practical methods that work in 2026 to test your idea before burning time and money.
·1 min read
Programming
Claude Code Tutorial 2026: Practical Guide for Developers
Learn how to use Claude Code in 2026 to automate your development workflow. Discover real use cases, honest limitations, and how to integrate it into your current projects.
·1 min read
Programming
Claude Code: The Complete Guide to AI-Powered Development Agents
Explore how Claude Code is transforming software development in 2026. Learn what it is, how it works, when to use it, and how to integrate it into your daily coding workflow.
·1 min read
Business
How to Validate Your Startup Idea in 2026: A Practical Step-by-Step Guide
Master the essential techniques for validating your startup idea in 2026. Learn proven methods, modern tools, and actionable strategies to avoid costly mistakes before investing significant time and capital.
·1 min read
Programming
Claude Code Tutorial 2026: A Complete Guide for Developers
Master Claude Code, the most powerful AI tool for development in 2026. Learn how to integrate it into your workflow, optimize productivity, and accelerate your development cycle with practical examples and real-world use cases.
·1 min read
Projects
I Built a Business Directory with a Dark Theme. Everyone Said I Was Crazy.
Most business directories in Spain follow the same pattern: white background, corporate blue typography, endless contact forms. With gestorías-cerca-de-mi I broke that mold in every UX decision I made. Here's the reasoning behind each choice and what I learned building it.
·1 min read
Business
Amazon FBA Dropped from 37x to 32x: The Market Correction That Makes 2026 the Buyer's Year
Online business valuation multiples have been compressing for months—Amazon FBA dropped from 37x to 32x monthly profit, content sites are at historical lows—and almost no one in the Spanish ecosystem is reading this signal correctly. Here's what it means, how to navigate the business acquisition market, and why buying a revenue-generating business may be smarter than building from scratch in 2026.
·1 min read
Programming
I Designed My Schema Wrong for Months. Here's What I Learned About Sanity (the Hard Way)
When I first started with Sanity, I treated the schema like a database form. Big mistake. After refactoring real projects in 2026, here are the patterns that actually change how you model content — from string literals over booleans to validations that protect the content team from themselves.
·1 min read
You're Pushing the System in the Wrong Direction (And That's Why Nothing Changes)
Most people work hard to change their results by tweaking the wrong parameters. Donella Meadows discovered this decades ago: the highest leverage points in any system are never the obvious ones. This article teaches you how to read the feedback loops in your life and push in the right direction.
·1 min read
Programming
Prompts That Actually Work in Claude Code (And the Mistake 90% of Devs Make)
Weeks using Claude Code with mediocre results. Then I changed one thing about how I prompted it and the difference was massive. It's not the model. It's you talking to it like it's a search engine.
·1 min read
Scarcity Mindset Is the Biggest Risk You're Taking (And You Don't Even Know It)
The people I know who 'guard their secrets' are in the exact same place they were three years ago. The ones who share everything keep moving forward. It's not a coincidence: scarcity mindset doesn't protect you, it paralyzes you. Here's why shifting that mental model is the most important strategic decision you can make in 2026.
·1 min read
Projects
The Impossible Marketing Problem of Nautilus VPN: How Do You Sell Privacy Without Betraying It?
Selling a VPN has a brutal contradiction at its core: almost every marketing tool you'd use to grow violates exactly what you're promising your user. Here's how I solved it in Nautilus VPN, commit by commit.
·1 min read
Business
Claude vs ChatGPT for Building Agents: The Decision Nobody Explains Properly
Most builders choose their LLM by inertia or by what they read on Twitter. But building profitable AI agents in 2026 requires something more specific: choosing the right model based on task type, not hype. Here's the framework I use.
·1 min read
Programming
8 Tools, 1 Stack, 0 Surprises: The Complete Indie Hacker Architecture for 2026
Most indie hackers don't lose time building — they lose it integrating tools nobody designed to work together. In 2026 there's an 8-tool stack that covers everything from database to social automation, frictionlessly and without rewrites. Here's the complete architecture, with the concrete patterns that make the difference.
·1 min read
Business
Your WADM Matrix Weights Are Lying to You (And How to Tell)
Most entrepreneurs fill out the WADM matrix with the weights they think they have. The problem: there's a brutal gap between what you say you value and what you actually weight when evaluating an idea. This article shows you how to spot that gap before it costs you months.
·1 min read
Programming
Claude Skills: The 3-Level System That Turns Claude into a Domain Expert (Without Retraining)
Most people use Claude like a generic assistant. But there's a whole layer—Skills—that transforms Claude into an expert for your specific workflow, loading procedural knowledge on-demand with a 3-level architecture built for efficiency. Here's how it works and how to build your own.
·1 min read
The Book That Made Me Stop Consuming and Start Producing (And Why It Changes Everything)
There's a book on financial mindset that most people ignore because the title sounds like an empty promise. But inside is a framework that completely reorders how you think about money, time, and business. Here's what I found.
·1 min read
Projects
The Algorithm That Decides Who Gets Into the Directory (And Why It Matters When Water Is Rising)
Building an emergency plumber directory is easy. Building one you can actually trust at 2am with a burst pipe is a different story. Here's the logic behind find-emergency-plumber.com's quality system, and what you can learn to vet service providers yourself.
·1 min read
Business
The Email They Almost Deleted: The 3 Metrics That Made Mailchimp a Giant (And That Your SaaS Is Probably Ignoring)
Mailchimp took 20+ years to reach its massive Intuit acquisition, with founders retaining 100% ownership. It wasn't luck—it was NRR, Rule of 40, and expansion revenue. Here are the real numbers that separate SaaS companies worth a fortune from those barely surviving.
·1 min read
Programming
Claude Agent SDK: 4 Patterns That Separate a Real Autonomous Agent from a Glorified Chatbot
Most developers build 'agents' that are, at their core, API calls with some conditional logic wrapped around them. Claude Agent SDK in 2026 proposes something fundamentally different: systems that gather context, act, verify their own work, and repeat the cycle autonomously. Here are the 4 concrete patterns that make that difference.
·1 min read
The Framework That Asks You to Imagine Failure (Before It Happens)
Most builders analyze failed projects after they die. The Pre-Mortem inverts that logic: you imagine the project has already failed, before you even start. The result is counterintuitive but powerful: more failure causes are identified than with any other planning technique.
·1 min read
Projects
What Building a Church Website Taught Me About Designing for Real Users
CCL Guadalajara is not a SaaS, generates no leads, and has no conversion metrics to report. And that's exactly why it was one of the most useful projects I've built in 2026: it forced me to design software for users who are not developers. Here's what I learned.
·1 min read
Business
The Margin Gap That Determines What Your Business Is Worth the Day You Sell It
The average physical business operates on margins of just 2.8-3.5%, while a digital course can hit 85-95%. But the real difference isn't in monthly profit—it's in what your company is worth the day you decide to exit. Here's the math that completely changes how you should think about what you build.
·1 min read
Projects
I Built a 6-Agent AI System to Publish Content Automatically. Here's How the Architecture Works.
I had 2,163 CNAE/IAE codes to cover and zero time to do it manually. The solution was a multi-agent system with Claude that orchestrates filtering, planning, writing, publishing, and social distribution autonomously. Here's how it's built, decision by decision.
·1 min read
Business
If Anyone Can Do It, No One Should: The CENTS Commandment We Keep Ignoring
34% of online businesses fail because they build something nobody wants. But there's a second, equally silent mistake: building something anyone can already do. MJ DeMarco's CENTS framework has a direct answer for this—and most entrepreneurs don't apply it until it's too late.
·1 min read
Programming
500K Free Invocations Per Month: What Supabase Edge Functions Actually Change in Your Stack (That Nobody's Talking About)
Supabase Edge Functions isn't just 'another way to write serverless'. With the Deno 2.1 runtime, dashboard-native testing, and a generous free tier, it fundamentally changes how you ship backend logic without leaving the ecosystem. Here's the real case, with code.
·1 min read
Second-Level Thinking: Why Almost Every Builder Makes the Wrong Decisions (And Doesn't Even Know It)
Howard Marks built one of the world's largest investment firms with a single edge: thinking differently—and better—than everyone else. This week, after covering Munger and Naval, I close the trilogy with the framework that's most changed how I evaluate every product decision.
·1 min read
Projects
I Built a Free Tool for Spanish Tax Authorities. Then I Had to Decide Whether to Kill It or Monetize It.
Conversor IAE CNAE started completely free. With 2,247 dynamically generated pages and real SEO traffic, the uncomfortable question arrived: how do you generate revenue without destroying what made the product useful? Here's the real monetization architecture I built: three layers, zero paid advertising, and the technical decisions behind each one.
·1 min read
Business
The Number Entrepreneurs Ignore Before Launching (And That Predicts Whether Anyone Will Pay)
34% of startups fail because they build something nobody wants. But there's a public, free, and brutally honest data point that predicts whether your market has real buying intent before you write a single line of code: CPC. Here's how to read it correctly.
·1 min read
Programming
5ms vs 200ms: Why Cloudflare Workers Changes What You Can Build (Not Just What You Pay)
Most developers see Cloudflare as a cheaper AWS alternative. They're looking in the wrong direction. The real difference isn't in cost — it's in the V8 isolate architecture that makes your product literally faster than competitors who pay more. Here's why in 2026 this is no longer optional.
·1 min read
Nobody Asks How Hard Buffett Works: The Naval Framework Everyone Ignores
Most people optimize for effort. Naval Ravikant has been saying for years that's exactly the mistake. Judgment—not hustle—is what separates those who build wealth from those who merely accumulate hours. Here's the complete framework and how to apply it in 2026.
·1 min read
Projects
I Analyzed Every Spanish Gestoría Directory and They All Fail the Same Way
When I started building Gestorías Cerca de Mí, the first thing I did was analyze what already existed in the market. What I found was surprising: it's not that directories don't exist, it's that they all make exactly the same mistakes. Here's the full analysis and the technical decisions I made to build something different.
·1 min read
Business
The Complete Map of Online Business Buy/Sell Platforms in 2026 (And the Signal Nobody Reads Correctly)
Building from scratch isn't the only path to a profitable online business. A mature acquisition market exists where current multiples are near historic lows, creating a real window for buyers. The problem is most people don't know how to read the right signals or choose the right platform for their profile.
·1 min read
Programming
From Scrapy to Apify: The Real Case Study That Made Me Rethink How I Build Production Scrapers
Daltix went from managing EC2 servers to scaling to 5 million resources per day while cutting infrastructure costs by 90%. It wasn't magic — it was switching to the right tool at the right time. Here's when that switch makes sense and how Apify works under the hood.
·1 min read
Munger's Mental Test Before Forming Any Opinion: The Ideology Trap That Destroys Good Decisions
Charlie Munger had a strange rule: before forming any opinion, he had to be able to argue the opposing side better than its own advocates. Few people pass that test. Here's why that changes everything, and how to apply it to your decisions as a builder.
·1 min read