From fixing a broken Facebook ad to building a full AI-powered CRM pipeline — I deliver working systems, not promises. Transparent hourly rates. Fast delivery. You own everything I build.
I'm Juan J. Carrillo — a full-stack developer and systems builder based in Orange County, CA. I started in business operations and finance, then taught myself to code by building real things: trading bots, CRM pipelines, AI tools, and lead capture systems.
Everything in my portfolio has been deployed, tested under real conditions, and used by real people. I don't build demos — I build systems that run.
My background in Accounting and Business Management (Saddleback College) means I understand the business problem first, then engineer the solution. That's the difference between a developer who builds what you asked for and one who builds what you actually need.
Simple, transparent, and fast. No jargon. No mystery pricing. No waiting three weeks for a reply.
Fill out the contact form or send a message. Tell me what's broken or what you want built. No tech knowledge needed — plain English works fine.
Within 24 hours I send you a clear scope: exactly what I'll build, the hourly rate tier, estimated hours, and a flat total. No surprises.
Most projects ship in 3–7 business days. You get progress updates. I test everything before I hand it over — it works when I say it's done.
Review it, request tweaks, then we deploy. You own all the code, credentials, and assets — no recurring fees, no dependency on me.
Three tiers based on complexity — from getting your digital presence right to building full AI-powered systems from scratch.
Get your business showing up and looking right everywhere it needs to be. I set it up, optimize it, and make it work.
Ongoing management of your digital platforms, ad accounts, and online presence so you can focus on running your business.
Fast, mobile-first websites built clean from scratch. No page builders, no bloat — just lean HTML/CSS that loads instantly and looks great on every device.
Custom forms that actually capture leads and route them to the right place. Built for mortgage, real estate, healthcare, and local service businesses.
Complete GoHighLevel or custom CRM builds — pipelines, automated SMS/email sequences, A2P compliance, smart lists, and calendar booking systems.
Custom AI tools, trading bots, automation pipelines, and data systems built from scratch. I operate as a one-person engineering team — I design, build, test, and deploy.
Every project here is live, production-tested, and built by me. No mockups, no demos.
Built a complete GoHighLevel CRM for a preschool — automated SMS and email enrollment sequences, A2P 10DLC compliance, a school tours booking calendar, smart lead lists, and a full Netlify website with embedded contact forms.
Designed and deployed a 3-form lead capture system for a nationwide wholesale reverse mortgage lender. Direct integration with LeadMailbox CRM, deployed on Cloudflare Pages, embedded into client's GoDaddy site via iframes, with a Loan Officer link generator for multi-branch use.
Built a real-time multi-sport prop analytics platform from scratch. Scores player props across 9 sports using a deterministic scoring engine, live stat fetching from ESPN and sports APIs, automated bankroll tracking, a deterministic value-tier scoring engine, and a live grading dashboard.
Engineered 5 autonomous trading bots managing equity and crypto positions across SPY, QQQ, BTC, ETH, and SOL simultaneously. Includes a capital allocator, real-time PnL tracker with persistence, automated risk controls, and a bot monitoring dashboard.
Built an IBKR-integrated automated options trading bot. Real-time position scanning, options scoring logic, and automated order execution routed through IB Gateway. Handles the full lifecycle from signal to filled order.
Built a multi-bot AI operating system with persistent memory, voice input, streaming chat interface, and support for multiple LLM backends (Claude API, Groq, Ollama). Includes conversation history, feedback loops, and a rich system context layer.
Built a full-featured AI image generation studio on top of ComfyUI. Includes 4 generation modes (text-to-image, image-to-image, sketch, batch overnight queue), 6 production models, 4K upscaling via Real-ESRGAN, watermarking, and a Telegram bot interface for remote generation.
No frameworks, no page builders. Pure HTML, CSS, and vanilla JavaScript. Mobile-responsive, deployed on Cloudflare Pages, Formspree-wired contact form. Built in a single session to professional production standard.
If what I deliver doesn't match the agreed scope, I fix it — free. No arguments, no invoices for rework. Scope is scope.
Three tiers based on the complexity and skill level required. I quote you estimated hours upfront so you know the total before work starts.
Social platforms, digital presence, online setup, and basic IT. The foundation every business needs to be found online.
Website builds, landing pages, lead forms, and deployments. Everything from a single page to a complete multi-page site.
CRMs, AI systems, trading bots, automation pipelines — full production builds. I operate as a one-person engineering team.
Answers to what most people ask before reaching out.
Three things most developers won't say out loud — but that actually matter when you're spending real money on a real project.
Every line of code, every account, every credential — it's yours the moment the project is done. No subscriptions to keep your site running. No monthly fee to "maintain access." No gotcha clauses.
vs. Agency model: they build it, they own it, you pay forever. I hand you the keys and walk you through every door.
A marketing agency quotes $5,000–$25,000 for what I build at $30–$65/hr. The difference? You're paying their rent, their account manager, their project manager, and their margin. With me, you pay one person who does the work.
I use completed client work in my portfolio. That means I'm personally invested in making your project look great — because every future client I pitch will see it. Sloppy work hurts me. Clean work wins me the next job.
Translation: I'm not just building your system. I'm building my name on it. That's the strongest quality incentive there is.
Ready to get something built without the agency overhead?
Let's Talk →Describe what you need — even if it's just "my website is broken" or "I want to run Facebook ads." I'll respond within 24 hours with a scope and quote or honest advice on what you actually need.
I'll reply within 24 hours — usually same day.