Founder & product builder

Jared Casillas

Personal AI. Useful websites. Things you can hold.

I turn the problems I live into things I can build. A second brain for my own context. A menu shaped by working in a restaurant. A printing service born in architecture school. product design · AI-assisted development · architecture · Xalapa, Mexico

Let’s talk Watch me walk through the work ↓

AISecond Brain / SecondYou AI

Webexperiences for everyday use

3Darchitecture & fabrication

Selected work

The work, explained
by the person building it.

These are my original walkthroughs from July 2026. The projects have evolved; the recordings show where the decisions started.

Original walkthrough · Jul 2026

Founder project · personal AI memory

Second Brain / SecondYou AI

I wanted my AI tools to remember the context behind a conversation. I began with a personal companion I could use on my phone. This is me showing that early version.

In this recording — the July prototype: conversation, voice, a personal timeline, and an interface built around a living orb.
Where it is now — a closed web beta since September 2026, using Supabase for accounts and private memory. The product and infrastructure have evolved since this recording.
My role — founder, product direction, interaction design, and AI-assisted development.

Second Brain: original narration and camera preserved. Personal journal text is covered in the recording.

Open the live menu ↗

Restaurant menu · Sitka, Alaska

Cold Water — digital menu

Working in a restaurant in Sitka gave me a practical design problem: make a large menu easy to browse on a phone. Here I walk through the interface I built around that experience.

Mobile navigation — clear categories, a sliding selection indicator, and layouts made for one-handed browsing.
Information design — drinks, breakfast, and children’s menus within one visual system.
My role — visual identity, interaction design, and AI-assisted web implementation.

Visit the live site ↗

Founder project · 3D printing

CD PRINTS

I started CD PRINTS around the model-making needs I knew from architecture school. This walkthrough connects the service, its visual identity, and the journey from digital file to physical object.

Print-shop identity system — a signature CMYK bar and a scroll-driven “printing…” progress meter that mirrors a real 3D print.
A visible process — a showcase of models, materials, and fabrication, with a path to discuss a quotation.
My role — service design, brand, website, and the connection between architectural models and physical fabrication.

Try a small piece

Details you can feel.

A standalone interaction study from Portugal Aventura: a moving route, a card with depth, and a little celebration when a plan comes together.

Interactive study · fictional data

Portugal, in motion.

Progress, 3D tilt, and completion feedback. A small, working example of how I think about interaction.

Try the demo ↗Explore the code ↗

How I work

From a real need
to something you can try.

01 — UNDERSTAND

Start with the situation

I look at who will use it, what gets in their way, and what a useful result would feel like. My architecture background starts with that same question.

02 — BUILD

Make the idea tangible

I direct the product and design, using AI tools to help implement and iterate. A working interface gives us something concrete to examine.

03 — EXPLAIN & REFINE

Show the work in use

I explain the decisions in walkthroughs like these, try the product in context, and use feedback to shape the next version.

Stack, by role

Tools behind the work

Personal AI

Claude API · Anthropic
Prompt caching · cost + latency
Tool use / agent loops
Structured outputs

Frontend

Installable PWAs
Responsive web interfaces
Canvas & motion design
Vanilla JS · zero-framework

Infra

Netlify serverless functions
Supabase · Auth, Postgres, Storage
Edge deploys · instant rollback
Cost-aware architecture

Integrations

OAuth 2.0 · Gmail / Calendar
Web Push notifications
Voice synthesis · ElevenLabs
MCP-style tool servers