Sistema24
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About me

Hi, I'm David. A business engineer who codes.

I started Sistema 24 so businesses get a website that sells, not just one that looks good. I design, build and measure every project myself.

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DavidFounder of Sistema 24

Why Sistema 24 exists

A website should pay for itself

I come from the business side. So I look at a website the way I'd look at any investment: how many clients does it bring in, and what does each one cost? Most sites I review look fine, but they don't answer in time, don't show up on Google, and nobody knows whether they've brought in a single client.

What I do is put both sides together: design and code, plus the business math. Before we start, we run the numbers with your figures; after launch, I send you what came in every month.

What I've built

Live projects you can open today

Real estate brokerages, a school with students in several cities, a platform for school special-education teams, registration for a tattoo expo, a uniform shop, a vocal coach's website and my own productivity app, Habit Scaling, which I sell in US dollars. These clients are in Chile; I work remotely with businesses in the US and UK the same way. See how each one was built in the case studies.

CIVI Propiedades: CIVI Propiedades: a brokerage with its own property search., desktop viewReal estate · BrokerageCIVI PropiedadesA Chilean real estate brokerage with its own property search, calculator, valuation tool and lead panel.Read the case study →Instituto Bíblico del Sur: Instituto Bíblico del Sur: apply, pay and study from your phone., desktop viewEducation · PlatformInstituto Bíblico del SurA Bible institute with students in many cities: online admissions, role-based campus, fees and library.Read the case study →Benji: Benji: less paperwork, more time with students., desktop viewEducation · PlatformBenjiPlatform for school special-education (PIE) teams in Chile: less paperwork, more time with students.Read the case study →Habit Scaling: Habit Scaling: my own app, sold in US dollars., desktop viewOwn app · SubscriptionHabit ScalingMy own productivity app: designed, built and sold as a USD subscription.Read the case study →

How I work

My rules

  • Fixed price in writing before we start.
  • A branded prototype in 72 hours, before the second payment.
  • You own the domain, accounts and data from day one.
  • No Google ranking promises — just work done right and measured.
  • On the blog I only publish facts with a source.
  • I work remotely with businesses in the US, UK, Latin America and Spain.

Latest articles

Websites · 7 minSmall business website checklist: 25 must-haves for a site that sells25 points to check your site in 20 minutes: mobile speed, message, trust, technical SEO, tracking and privacy.Read →WhatsApp & AI · 7 minWhatsApp Business API pricing: what it costs and how it works in 2026App vs. API, how Meta charges per message, the 24-hour window and how to automate replies with AI by the rules.Read →SEO · 8 minGoogle Business Profile: a step-by-step guide to showing up on Google MapsStep by step: set up, verify and improve your Google Maps listing — following Google's official rules.Read →SEO · 8 minSEO for service businesses: how to get clients from Google without living on social mediaHow to win clients from Google without living on social media: money pages, topic clusters and tracking quote requests.Read →Web apps · 7 minHow to choose a web developer without regrets.The questions to ask before you sign, the red flags to watch for, and what must be in your name.Read →Web apps · 7 minWeb app or native app? When each one makes sense.Real differences, costs, App Store and Google Play fees, and when each one makes sense (PWAs included).Read →

Let's talk.

Free 30-minute assessment. I'll tell you honestly whether I can help, what it costs and how long it takes.

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