Rafael David H.

✅ I build and fix the systems behind your website and CRM, then prove each change works ✅ Recent: 1,002 broken CRM records repaired in one batch, zero errors ☑️ Developer and marketing automation specialist in one, so you hire once, not twice 🔍 HubSpot · ActiveCampaign · Python · Next.js · React · Supabase · PostgreSQL · GA4 · GTM · Zapier 📞 Invite me to your project or send a direct message to start a conversation. Hey, I'm David! I'm a software engineer and full-stack developer, working since 2018, and what sets me apart is that I sit at the intersection of technical development and marketing automation. Most clients are forced to choose: a developer who doesn't understand marketing tech, or a marketer who can't write real code. I bridge that gap entirely. I have worked full-time with Growth Geyser, a RevOps and CRM agency, since 2024. I build and repair the systems behind our clients' websites and CRMs, for companies in telecom software, private lending, medical equipment service, legal nonprofits and financial education. Recent work, with the numbers: ✅ 1,002 of 1,002 corrupted CRM company records repaired in a single batch with zero errors, after a 20-row sample and 5 live records checked by hand. ✅ Ad conversion tracking that had been firing for almost nobody: cause measured on the live page, fixed in the site itself, one conversion per submit verified on production. ✅ Two multi-step lead forms replaced with one-page forms without breaking the machinery around them: 105 of 105 connection checks and 36 of 36 live checks passed, plus 12 workflows verified by hand. ✅ 1,025 contacts loaded and tagged with zero errors, reconciled in both directions against the source file. ✅ Two WordPress sites re-platformed to Next.js, every page checked against its own written specification. Today I architect and implement growth systems end to end: landing pages and frontend builds, CRM automation, API integrations, and conversion tracking that shows what is actually working. I design systems with minimalism in mind: fewer moving parts, fewer points of failure, less maintenance, and greater scalability. I also use AI-assisted development workflows to move faster and ship cleaner code: fewer bugs, more reliable deliverables and tighter turnaround times without cutting corners. In 2023 I led a cross-functional team of 5 engineers through two-month sprints to deliver a full PWA, shipped to web, Google Play and the App Store with offline capability, built in Angular, Ionic and Firebase. That is where the habits came from: the discipline of a team lead, and the technical depth of someone who has shipped production apps at scale. How I work: ✅ One hire, full coverage: frontend, backend, APIs, automation and analytics. No need to coordinate multiple freelancers. ✅ Nothing goes live on a guess. Every script defaults to a dry run, every bulk operation gets a small validated batch first, and every change is verified against the live system afterwards. ✅ Clean, scalable solutions. Whether custom-coded or no-code, I build things that last and don't break. ✅ Full funnel visibility. I implement GA4, GTM and conversion tracking so your data is accurate and your decisions are informed. ✅ I tell you what I verified and what I assumed, and I write down how it works so the next person can run it without me. Automation and CRM Solutions: ☑️ HubSpot: workflows, pipelines, CRM configuration, forms and lists, through the API as well as the interface ☑️ ActiveCampaign: automations, segmentation, email sequences, API integration ☑️ CRM data migration and repair at scale, with an audit trail of every record touched ☑️ Python API integrations between a CRM and whatever else the business runs on ☑️ Zapier: code steps that replace fifteen builder steps with one piece of code you can read ☑️ Custom API integrations: HubSpot, ActiveCampaign, Zendesk Sell and more Development and Tracking Solutions: ☑️ Websites and re-platforms: Next.js, React, TypeScript, Tailwind CSS, Vercel ☑️ Backend and database: Supabase, PostgreSQL, row-level security, triggers, Node.js, REST and GraphQL APIs ☑️ Google Tag Manager: custom JavaScript, form listeners, event triggers ☑️ Google Analytics 4: custom events, conversions, funnel tracking ☑️ Technical SEO: sitemaps, robots, canonicals, JSON-LD, Search Console ☑️ Form integrations: HubSpot, ActiveCampaign and custom form solutions If you need someone who can handle the full picture, build the system, automate it and prove its performance, invite me to your project or send me a direct message. Let's build something that actually moves the needle.