EXECUTE_CREATION PRODUCT_DESIGN AI // HEALTH // FINTECH SYS.PORTFOLIO.V3
[SYS] PORTFOLIO ACTIVE
SENIOR PRODUCT DESIGNER
SPECIALIZING IN AI PRODUCTS
03.6808° S / 38.5230° W
FORTALEZA, BRAZIL
REMOTE // GLOBAL
Walmir de Castro
Design+Tech
I design products at the intersection of AI, complex systems, and real human needs.
>_ AI DESIGN PATTERNS
>_ CLINICAL DOCUMENTATION
>_ ENTERPRISE PLATFORMS
>_ DESIGN SYSTEMS
>_ 0 → 1 PRODUCTS
>_ REACT PROTOTYPES
03.6808° S / 38.5230° W
FORTALEZA, BRAZIL
REMOTE // GLOBAL

4 COUNTRIES · 7+ YEARS
Experience 7+ Years
Countries BR · US · UK · CA
Users Impacted 100M+
Focus AI · Health · Fintech
Status Available
01 — Selected Work

Projects

AI products, platform architecture, enterprise systems. Led from discovery through delivery.

01
Logcare
SCAN.01 // AI
01
Clipboard Health
Logcare
AI Clinical Documentation
AI Healthcare 0→1 HIPAA
02
Meltwater Newsletter
SCAN.02 // AI
02
Meltwater
Newsletter IA
AI-First Redesign
AI IA Prototypes Media
03
GoDaddy Payments
SCAN.03 // FIN
03
GoDaddy
Payments
Fintech features at scale
Fintech Self-Serve Risk
04
PTlytics Mobile App
SCAN.04 // MVP
04
Healthlytics Canada
PTlytics
Healthtech Mobile App
Startup Healthtech 0→1
05
OKA Mobile App
SCAN.05 // MOB
05
OKA
OKA Mobile
“Uber of home renovation”
Startup MVP Funded
06
Candidate Portal
SCAN.06 // UX
06
Fullstack Labs
Candidate Portal
Web App & Dashboard
Discovery Visual Design Prototype
02 — Latest Experience

Where I’ve Been

Clipboard Health
Senior Product Designer · Contract
Sep 2025 — Present · Remote (US)
Co-created Logcare, an AI-powered clinical documentation tool for home caregivers with voice-to-text capture and intelligent switching between SOAP, SOAPIE, and PIE note formats. Architected ShiftChat, a dual-product platform combining SaaS tools for facility operators with an API/SDK for healthtech developers—designed HIPAA vetting, developer portal, and webhook management. Built functional React/TypeScript prototypes to align design and engineering.
AI Healthcare 0→1 Platform HIPAA
Meltwater
Senior Product Designer · Contract
Feb 2026 — May 2026 · Remote (US)
Redesigned the Newsletter product’s information architecture, restructuring the experience around the edition-sending workflow based on synthesis of customer call recordings. Built React prototypes comparing alternative IA approaches and presented a structured UX heuristic analysis to executive stakeholders. Defined AI-first design principles—human-in-the-loop interaction, source citations, status clarity—to guide the upcoming feature roadmap.
AI Media Intelligence IA Prototypes
Deel
Senior Product Designer · Contract
May 2025 — Dec 2025 · Remote (US)
Led design of Benefits and Equity features for a global HR and payroll platform supporting employees across multiple countries.
HR Tech Fintech Global
GoDaddy
Senior UX Designer · Long-Term Contract
Dec 2022 — Jun 2025 · Tempe (US)
Led UX/UI for Faster Payouts and risk assessment features used at scale, strengthening fraud prevention and reducing false positives. Redesigned chargebacks, fraud prevention, transactions, and payouts to improve task completion and reduce support escalations. Shipped a self-service Chargebacks Portal that streamlined merchant resolution. Other shipped features: Rolling Reserves, Tax Center, Reports redesign, Alert System enhancements, Rate Saver.
Fintech Risk CRO Scale
↓ Download Full CV
03 — About

Who?

I am a senior product designer based in Fortaleza, Brazil. I like all things involving animation, online games, and cats.

I design products at the intersection of AI, complex systems, and real human needs. I have an architecture background with a postgraduation in UX, digital accessibility, and HCI. For the past 7 years, I’ve been working in various areas of design across the globe for Brazil, US, and UK-based companies, shipping 0→1 products, building functional prototypes in React and pushing for data-driven solutions.

Skills & Tools
AI Design Patterns LLM UX Design Systems Information Architecture Prototyping User Research React TypeScript Figma Accessibility Usability Testing Conversion Optimization Stakeholder Mgmt
Walmir de Castro
IMAGE · TODO Drop portfolio-assets/about/portrait.png to enable the about image.
04 — Testimonials

What They Say

[LOG] PEER_REVIEW.EXE
AH
SS
AZ
Allie Hough-Barkley Design Manager, GoDaddy
Walmir crafts thoughtful designs and brings a collaborative spirit to every project. He is never shy about providing his expert opinion, as well as actively listening to feedback. I knew I could give him any project and it would be designed beautifully, rooted in customer need, and iterated quickly. One of the highest performing designers I’ve had the pleasure to work with.
[Click avatar to switch]
01 / 03
05 — Contact

Let’s Talk

decastro.walmir@gmail.com
Location
Fortaleza, Brazil — Remote
Availability
Open to contract & full-time
Response time
Within 24 hours
Time zone
BRT — UTC−3