Hi, I'm Maribel Sosa, a Product Designer working on complex digital products across fintech, e-commerce, and AI-driven experiences. My work combines systems thinking, behavioral insight, and visual craft to create products that drive trust, usability, and measurable business impact.
A handful of projects where research, strategy, and craft compounded into measurable outcomes. Each case study is written as I'd present it in a portfolio review.
Designing re-authentication and factor flows for Mercado Libre and Mercado Pago. A framework-first case study on security UX at LATAM scale — pixels omitted per confidentiality.
Reframing a leaderboard-driven referral campaign into a mission-based experience for one of Mexico's leading digital banks. Driven by qualitative research that surfaced the emotional barriers users faced when referring friends.
A research-led redesign of the landing page for Stori's SHEIN co-branded credit card. By prioritizing the benefits users actually valued — and cutting the noise — the page got clearer, and conversion rose.
Rebuilding a Chilean pension app from scratch for MetLife — designed for a user base spanning every adult age, where a 20-year-old and a 70-year-old had to complete the same financial tasks. Owned end-to-end with a globally distributed team.
A complete e-commerce redesign for a century-old American education brand. Senior UI Designer engagement at Huge Inc — building foundations, components, templates, and motion for Varsity Brands.
Three principles that shape every project I take on, from discovery to launch.
Every interface I ship is grounded in evidence. I run quantitative surveys to size the problem and qualitative interviews to understand the why. The Stori referral redesign started with a single insight from six interviews — users felt ashamed to refer — that reframed the entire program.
Senior design isn't faster pixel pushing — it's questioning whether the brief is right. The best contribution I made on Stori wasn't a screen. It was the strategic shift from a competitive leaderboard to a mission-based system, which unlocked +22.85% growth.
I've worked in growth squads, where every screen has a target. I'm fluent in conversion funnels, retention cohorts, and post-launch surveys. I write success criteria before I open Figma, and I measure what I shipped.
I'm a Product Designer who turns complex product challenges into clear, scalable experiences. My background spans fintech, commerce, and growth — environments where rigor meets accountability.
I'm currently at Mercado Libre, designing security experiences across Mercado Libre and Mercado Pago — web and mobile. It's high-stakes, cross-platform work: the kind where clarity isn't a nice-to-have, it's what keeps people's money and trust intact.
I work end-to-end with product and engineering teams — framing problems through research, translating insight into systems, and shipping decisions that move both user experience and product performance. I'm open to Product Designer Specialist roles where that approach can compound.
Let's build something great together. Always open to new ideas, interesting products, and thoughtful collaborations.