Sebastian M.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Senior product designer and design engineer with ten years across design and engineering. Since 2020, my focus has been AI products: agents, generative interfaces, and the systems that make them reliable enough to ship. I currently lead design for Casey, Chase's first consumer-facing AI agent, deployed across voice and RCS for home lending. Earlier at Chase, I built the mortgage calculator suite, an award-winning tool that lifted lead conversions by roughly 20%, and contributed to a #1 J.D. Power ranking. Previous experience: - Writer: designed ReWrite, a generative rewriting interface - Chorus: product design and design system, through its acquisition by ZoomInfo - Salesforce: UX for Contact Support AI How I help startups: - AI and agent UX: conversational and voice interfaces, generative UI, human-in-the-loop review, and evaluation tooling - Design systems: tokens, components, and documentation, implemented in code so they stay consistent as you scale - Working prototypes: React, TypeScript, SwiftUI, and Electron, built with Cursor and Claude Code, so you can validate real behavior with users and investors instead of static mockups - Regulated, high-stakes products: fintech, lending, and other flows where clarity and compliance carry equal weight - Zero-to-one product strategy: turning an early concept into a scoped, buildable spec your engineers can execute I also build my own products. Memento, an iOS voice journaling app that runs fully on-device with Apple's Foundation Models, is currently in beta. I've also designed and published a variable typeface on npm. Bilingual in English and Spanish. Based in Dallas, working on Pacific hours with Bay Area teams. If you're building an AI product and need someone who can own it from strategy through a working prototype, let's talk.