focus4tech.

About

Andres Bautista

South Florida (remote-friendly)

AB

focus4tech is where I document experiments, lessons learned, architectures, and practical applications of AI and automation in real environments—not slide decks or theoretical prototypes.

I'm a software engineer with more than a decade of experience designing, building, and operating production systems across web, data, and cloud. My focus is measurable business outcomes: LLM-based applications, automation, data pipelines, marketplace systems, and scalable web apps that reduce manual effort and improve decisions.

I've shipped as a founder and builder—including vive.us (South Florida rental marketplace with production AI search and listing workflows) and U-Bell.com (real estate investor platform). When teams need help closing the gap between demo and production, I offer scoped audits and sprints—see Services.

Based in South Florida (remote-friendly). Available for remote work and occasional on-site workshops by arrangement.

Why focus4tech?

The name is intentional: focus on a narrow scope that ships, 4 as in for—technology teams—and tech that works in production. The site captures what I learn building; consulting is a separate, scoped offer when it fits.

Founder products

Platforms I built and operate—scope, AI work, and lessons in more detail than a LinkedIn post allows.

Founder buildFounder build · South Florida rentals

vive.us — rental marketplace with production AI

Problem
Listing copy and discovery had to scale across MLS-sourced inventory. Renters needed natural-language search; ops needed consistent descriptions for the public site, Facebook Marketplace packs, and other channels—without inventing fees, policies, or contact CTAs.
Approach
Shipped phrase rental search (LLM-ranked matches over published inventory, IP rate limits, graceful degradation). Built MLS description enhancement with channel-specific prompts (Gemini/OpenAI). Wired AI into marketplace posting packs and an agent-facing Miami prompt-library landing page. Grounded prompts with explicit “do not invent” rules for vouchers, HOA, and landlord policies.
Outcome
Live on vive.us: phrase search on home and /rentals, description enhancement in the MLS Supply Engine, marketplace packages, and SEO city pages—alongside Auth0, Prisma/Postgres, and Netlify production deploys.
Lesson
Marketplace AI needs a different contract per surface—ranking vs. copy vs. ops tools—and hard boundaries on what the model is allowed to assert.
Founder buildFounder build · RE investors

U-Bell.com — real estate investor platform

Problem
Investors needed one place to evaluate deals, model returns, and work through buy/lease/sell workflows instead of scattered spreadsheets and ad hoc tools.
Approach
Built and operated the U-Bell.com Next.js app: Auth0 login, investment listings and detail pages, ROI/equity utilities, dashboard and opportunities flows, plus Docker deploy and Cypress coverage on core auth journeys.
Outcome
Founder product on u-bell.com that established the same production patterns later extended on vive.us—identity, typed React UI, and shipped deploys before the rental marketplace grew.
Lesson
Shipping your own product first forces the discipline you later bring to client work: auth, deploy, and a narrow UX beat feature sprawl.
Consulting servicesBook a discovery call

Production patterns, not hype

Read case studies below—or reach out if you need a scoped audit or sprint.

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