Product UI & Frontend
Fast, consistent interfaces focused on conversion and usability.
UI/UX and design systems
Core Web Vitals optimization
WCAG 2.2 accessibility
3 servicios
Ray MartínFullstack Product Developer
I build production-grade SaaS platforms, mobile apps, and scalable web products with Next.js, React, Node.js, and TypeScript. From Stripe payments to KYC compliance (Sumsub), I deliver end-to-end solutions with 96+ Lighthouse scores and AI-assisted development workflows.
0+
years of experience
0+
projects delivered
Performance (Core Web Vitals)Accessibility (WCAG 2.2)Security & authentication
Next.jsTypeScriptReactNode.jsTailwind CSSReact NativePostgreSQLPrismaStripeSupabaseNext.jsTypeScriptReactNode.jsTailwind CSSReact NativePostgreSQLPrismaStripeSupabase
SupabaseStripePrismaPostgreSQLReact NativeTailwind CSSNode.jsReactTypeScriptNext.jsSupabaseStripePrismaPostgreSQLReact NativeTailwind CSSNode.jsReactTypeScriptNext.js
01 / Services
Services
I build reliable, fast, and accessible experiences with a business-first mindset.
Backend & Integrations
Robust APIs, event-driven workers, and scale-ready data flows.
REST/GraphQL API integration
Data modeling and performance
Prisma, Supabase and PostgreSQL
Stripe payments, billing and webhooks
Sumsub KYC/KYB and compliance
Web3 onboarding with Magic Link and wallets
6 servicios
Security & Auth
Secure authentication, fraud prevention, and endpoint protection.
Anti‑bots and invisible validations
Rate limiting and endpoint protection
OAuth with Google, Apple, GitHub
Secure sessions and best practices
4 servicios
DevOps & Delivery
Observable releases with predictable performance.
CI/CD with Vercel and GitHub Actions
Edge and smart caching
Monitoring, alerts, and metrics
3 servicios
02 / Experience
Professional experience
Experience across startups, consulting, and product teams with measurable impact.
2025 - Current
Fullstack Product Developer
FreelanceRemote · EU & LatAm
01/2021 - 12/2024
Freelance Developer
FreelanceLas Palmas de Gran Canaria, Spain
11/2021 - 12/2022
Frontend Developer
Metary PlatformLas Palmas de Gran Canaria, Spain
06/2020 - 05/2021
Data Analyst
ButlerScientific, S.L.Barcelona, Spain
05/2019 - 06/2020
Frontend Developer
Raúl LópezLas Palmas de Gran Canaria, Spain
03 / Skills
Skills
Technical stack, tools, and methodologies built for high-impact products.
skills.ts
Modern UI/UX design with React, Next.js, and Tailwind CSS · Scalable backend with Node.js, Prisma, and Supabase · Applications with Next.js, React, and Expo · Responsive experiences across all devices · Data management with PostgreSQL, Prisma, and Firebase · REST/GraphQL APIs, Stripe, Sumsub (eKYC), Magic Link, and Web3 · Version control with Git and GitHub · Automated deploys with Vercel and Expo · Clear, maintainable technical documentation · Cloud services across AWS, GCP, and Vercel · Mobile app development with React Native and Expo · Unit, integration, and E2E testing · CI/CD automation with GitHub Actions · Web security and data protection · Performance optimization and Core Web Vitals · WCAG 2.2 compliant development · Analytics with Google and Vercel · AI-assisted development with Cursor, Claude, and Copilot
Product UI & frontend systems
Next
React
React Native
iOS
Android
HTML
CSS
JavaScript
TypeScript
TailwindCSS
Responsive Design
04 / About
About me
StackNext.js · React · Node.js · TypeScript
FocusSaaS · Fintech · Mobile
BasedSpain · Remote EU/LatAm
I am a fullstack product developer with 7+ years of experience leading the full lifecycle: discovery, UX, development, deployment, and continuous improvement across 19+ shipped products.
I build with Next.js, React, Node.js, PostgreSQL, and edge runtimes — leveraging AI-assisted development (Cursor, Claude, Copilot) to deliver fast, accessible, and secure platforms with consistently high Lighthouse scores.
I partner with startups and scale-ups across EU and LATAM, integrating Stripe payments, Sumsub KYC/AML, Magic Link auth, and Web3 wallets to drive conversion, compliance, and scale.
05 / Projects
Featured projects
Selected recent work
View project — Aurantis
Top01Fintech
+2
Aurantis
Physical asset tokenization platform in Next.js. Stripe payments, Sumsub KYC, Docuseal contracts, and Supabase CMS.
78
95
100
100
93avg
View project — 4Pets Website
Top02Platform
+1
4Pets Website
Animal management platform with Next.js web and mobile app. Robust auth, marketplace, real-time notifications, and geolocation.
88
95
96
100
95avg
View project — 4Pets Mobile App
Top03Mobile App
+2
4Pets Mobile App
iOS/Android app in Expo with lost-pet alerts, live location, and push notifications.
88
95
96
100
95avg
View project — Abanzamed
Top04Healthcare
+3
Abanzamed
Corporate site for Abanzamed built with Next.js, Tailwind, Supabase, and Prisma. Scalable solution optimized for SEO and performance.
96
97
97
100
98avg
View project — TokenCrowd
Top05Blockchain
+2
TokenCrowd
Blockchain investment platform enabling tokenized project funding. Next.js full-stack with Prisma, KYC/KYB via Sumsub, Web3 wallet integration, and admin panel with CRM.
85
90
96
100
93avg
View project — Naranest - Baby Tracking App
Top06SaaS
+2
Naranest - Baby Tracking App
Complete app to track feeding, sleep, diapers, growth, activity, and medical events. Includes Google authentication, multi-user collaboration, dashboard metrics, real-time notifications, and Stripe subscription management.
100
96
100
100
99avg
06 / Case Studies
Case studies
Selected engagements with measurable outcomes.
01
Aurantis
Fintech platform
+2
Landing and product experience focused on trust, compliance, and conversion.
Challenge
Communicate a complex value proposition while keeping onboarding simple and secure.
Solution
Performance-first build with clear hierarchy, compliance messaging, and scalable integration patterns.
Highlights
- Reusable sections for faster iteration
- CTA flows aligned with onboarding
- Consistent visual system for trust
02
4Pets Website
Pet health platform
+1
Marketing site focused on acquisition and product clarity.
Challenge
Present services and app benefits without overwhelming the user.
Solution
Content architecture with modular sections and mobile-first delivery.
Highlights
- SEO-ready structure for growth
- Benefit-led narrative across pages
- Reusable components for campaigns
03
Naranest
Baby tracking app
+2
Full SaaS platform for families to track feeding, sleep, diapers, growth, and medical events.
Challenge
Build a complete end-to-end product with auth, subscriptions, and multi-user collaboration while keeping the experience simple.
Solution
Modular architecture with Next.js, Prisma, and Stripe. Dashboard with metrics, real-time notifications, and optimized subscription flow.
Highlights
- Perfect Lighthouse: 100 in performance, best practices, and SEO
- Stripe subscriptions and billing fully integrated
- Multi-user collaboration with roles and permissions
04
Ray Martín
Personal brand website
+1
Personal site built to showcase expertise and convert leads.
Challenge
Explain specialization and value within a single, clear flow.
Solution
Modular landing page with strong hierarchy, social proof, and direct CTA.
Highlights
- Core Web Vitals and accessibility prioritized
- Internationalization for ES/EN
- Lightweight micro-interactions
09 / Testimonials
What Clients Say
Feedback from teams I've partnered with to build and ship products.
Ray delivered a complete fintech platform with KYC, Stripe payments, and an admin panel in record time. His attention to detail in security and performance is exceptional.
Working with Ray was an excellent experience. He transformed our idea into a mobile and web app with impeccable UX and impressive load times.
The code quality and architecture Ray implemented for Naranest allowed us to scale seamlessly. Perfect Lighthouse scores from day one.
Trusted by teams building real products
07 / Libraries
Libraries
Open-source packages I publish to help teams move faster.
08 / Blog
Blog
Tutorials, guides, and best practices for developers.
09 / Methodology
Methodology
Iterative process to deliver value with clarity, quality, and speed.
Step 01
Discovery
Business, goals, users, and success metrics.
Step 02
Design
Wireframes, UI, and architecture with states and validations.
Step 03
Development
Short iterations, testing, and reusable components.
Step 04
QA
Functional, accessibility, and performance review (CWV).
Step 05
Delivery
Automated deployment, verification, and handoff.
Step 06
Maintenance
Continuous improvement, analytics, and evolving roadmap.
10 / FAQs
FAQs
Clear answers about scope, timelines, and stack.
Let’s grow your product
Performance, accessibility, and security that build trust and growth.