Flagship · Live · 2025
Separalo
Multi-tenant booking SaaS for service businesses. Handles auth, scheduling, and tenant isolation. Built solo, front to back. React and TypeScript on the frontend, Convex as the reactive backend.
Full-stack engineer
in Dallas.
Six years writing React, TypeScript, Node, and PHP for production. Currently a Senior Software Engineer at Clear C2, working on CRM software.
I also run Nottifai LLC on the side, where I ship smaller commercial products.
Daily toolkit
- Claude Code
- Codex
- Cursor
- React
- TypeScript
- Next.js
- Node.js
- PHP
- Convex
- Postgres
- Tailwind
- shadcn
- Expo
- React Native
- Stripe
- Vercel
- Cloudflare
- Git
Currently
Shipping the Nottifai reminder app.
Nottifai LLC
Texas LLC, founded November 2025. Three independent commercial software products, all designed, built, and operated by me outside of work hours at Clear C2.
CardAI Studio
Live · 2024
My first commercial product. Generates custom seasonal cards using AI. Long-running image generation with staged polling and server-sent events, so users can close the tab and come back later.
Nottifai
Apr 2026
Reminder app for messages, calls, emails, and recurring events. Releasing this month.
Other projects
Hackathon builds, side experiments, and the writing.
FileBurn
2025
Ephemeral file sharing with client-side AES-256-GCM encryption. Files are encrypted in the browser before upload; the key lives only in the URL fragment. Collections self-destruct after a user-defined TTL.
Compendai
2024
Offline markdown note-taking app. Notes live in local storage. No backend. Works without internet.
ESLIA
2024
Screenshot pending
ESL exercise generator
ESL exercise generator. Built for a Vercel hackathon; generates lessons from any topic. Frontend-only, backend retired.
Blog
2024
Personal writing. Built with Outstatic CMS on Next.js.
Experience
Present
Senior Software Engineer
Clear C2 · Dallas, TX
Full-stack work on enterprise CRM software. React and TypeScript on the frontend, PHP on the backend.
Nov 2025
Founder
Nottifai LLC
Founded and run a Texas LLC that houses three independent commercial products: Separalo, CardAI Studio, and Nottifai. All design and development done solo.
2019 to 2025
Full-stack Engineer
Prior roles and contracts
Roughly six years of production work across a handful of roles. React and TypeScript on the front, Node and PHP on the back. Postgres and Convex data layers. Stripe billing. Whatever ops the team needed.
Contact
Open to full-stack roles in DFW. Remote, hybrid, or on-site. Mid-level or senior.
- Emailjoelecastilloj@gmail.com
- GitHubgithub.com/latinrev
- LinkedInlinkedin.com/in/joellcastillo
- Webjoelcastillo.dev