Open to thoughtful conversations

Design Engineer

I work where design and code meet, crafting digital experiences that feel intuitive, look intentional, and solve real problems.

View my work About me :)

Years building software: 13+
Where I started: Industrial Design
Cloud, data, APIs, web, mobile: Full Stack

Places I've built with

Character.aiVialZocdocUpcraftDrimoVeeklsGobcityFinalCharacter.aiVialZocdocUpcraftDrimoVeeklsGobcityFinal

What I do

The interface, and the system behind it.

Design Engineering

Bridging product design and engineering: typography, reading themes, UX layout, and systems that keep interfaces consistent.

Design systems & tokens
Typography & visual craft
UX layout & interaction
Designer-engineer collaboration

Mobile & Frontend

Native-feeling mobile and web experiences, from content platforms to generative media viewers.

React Native & React
Content & media experiences
Performance-minded UI
Accessible interaction design

Architecture & Platform

Shared libraries, tooling, and practices that raise the engineering bar across a team.

Domain-driven design
Shared component libraries
CI & lint enforcement
Serverless & modular systems

Selected work

Recent work I've built and polished.

Mobile App Feature

Library & Series

Character.ai's short-form Series and long-form Read and Listen on mobile, including extras and unlocks. I led the technical design and built nearly all of the surface with product and design.

Press

Web Experience

Interactive Stories

Choose-your-own-adventure stories on Character.ai Labs—chapter intros, choices, endings, and related recommendations. I co-led a two-engineer build of the playback core through launch.

Visit Press

Mobile App Redesign

C.UI design system

Character.ai's mobile theming, component library, and rebrand. I authored most of the primitives, reinforced them through conventions, reviews, and tooling, and added accessibility settings for color saturation and contrast.

Mobile App

Finpik

Personal finance for budgeting, credit cards, loans, savings, and investments. Designed and built end to end as a side project.

Visit

About

Curious about me?

Hi, I'm Momo. I've been working as a full-stack engineer for over 13 years, but what's always driven me is the space where design and code meet.

My background in Industrial Design taught me to care deeply about how people experience what we build, not just how it is built. That lens of empathy, curiosity, and clarity shapes everything I do.

I believe in progress over perfection: always moving forward, always caring about quality.

I also make music as Carved in Black, and at Data Neura Labs I build Finpik and SyncScrub.

Languages: Spanish (Native) - English (Full Professional)

Duoc UC, Industrial and Product Design

Full story on LinkedIn

Santiago Marín

Design Engineer @ Character.ai

Santiago, Chile

Experience