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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.
Download CV — EN (Hero)
7+

years of experience

19+

projects delivered

Performance (Core Web Vitals)Accessibility (WCAG 2.2)Security & authentication
Next.jsTypeScriptReactNode.jsTailwind CSSReact NativePostgreSQLPrismaStripeSupabase

Services

I build reliable, fast, and accessible experiences with a business-first mindset.

Product UI & Frontend

Fast, consistent interfaces focused on conversion and usability.

  • UI/UX and design systems
  • Core Web Vitals optimization
  • WCAG 2.2 accessibility

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

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

DevOps & Delivery

Observable releases with predictable performance.

  • CI/CD with Vercel and GitHub Actions
  • Edge and smart caching
  • Monitoring, alerts, and metrics

Professional experience

Experience across startups, consulting, and product teams with measurable impact.

Fullstack Product Developer

2025 - Current
Freelance

Freelance Developer

01/2021 - 12/2024
Freelance

Frontend Developer

11/2021 - 12/2022
Metary Platform

Data Analyst

06/2020 - 05/2021
ButlerScientific, S.L.

Frontend Developer

05/2019 - 06/2020
Raúl López

Skills

Technical stack, tools, and methodologies built for high-impact products.

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
Back-end development
  • Node
  • Expo
  • PostgreSQL
  • Prisma
  • Supabase
  • Docker
  • SQL
  • AdonisJS
  • Express
  • Firebase
  • Stripe
  • Sumsub eKYC
  • Magic Link
  • Web3 / Wallets
Tools & platforms
  • Vercel
  • GitHub
  • Expo App Services
  • Cursor AI
  • Claude AI
  • GitHub Copilot
  • Postman
  • Zapier
  • Trello
  • Jira
  • Figma
  • Docker
Languages
  • Spanish
  • English
  • French
Methodologies
  • Agile
  • Scrum
  • Kanban
  • Lean
  • Design Thinking
Education and certifications
  • Responsive Web Design
  • JavaScript Algorithms and Data Structures
  • Tourism Degree (ULPGC)

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

About me

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.

Featured projects

Selected recent work

A selection of digital products delivered with a focus on performance, accessibility, and business outcomes.

View project — Naranest - Baby Tracking App

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
Performance
96
Accessibility
100
Best practices
100
SEO
View project — Aurantis

Aurantis

Physical asset tokenization platform in Next.js. Stripe payments, Sumsub KYC, Docuseal contracts, and Supabase CMS.

78
Performance
95
Accessibility
100
Best practices
100
SEO
View project — 4Pets Website

4Pets Website

Animal management platform with Next.js web and mobile app. Robust auth, marketplace, real-time notifications, and geolocation.

88
Performance
95
Accessibility
96
Best practices
100
SEO
View project — 4Pets Mobile App

4Pets Mobile App

iOS/Android app in Expo with lost-pet alerts, live location, and push notifications.

88
Performance
95
Accessibility
96
Best practices
100
SEO
View project — Verónica Moreno's Website

Verónica Moreno's Website

Professional website for Verónica Moreno built with Next.js and TypeScript. Multilingual, responsive, and SEO-optimized to improve visibility and conversion.

100
Performance
98
Accessibility
100
Best practices
85
SEO
View project — Abanzamed

Abanzamed

Corporate site for Abanzamed built with Next.js, Tailwind, Supabase, and Prisma. Scalable solution optimized for SEO and performance.

96
Performance
97
Accessibility
97
Best practices
100
SEO
View project — Pandemic

Pandemic

Digital board game built with React and Redux. Interactive experience, real-time state management, and responsive design.

98
Performance
96
Accessibility
96
Best practices
100
SEO
View project — Metary Platform

Metary Platform

Landing page for a metaverse platform with Next.js and React. CMS integration, optimized performance, and SEO focus.

99
Performance
92
Accessibility
100
Best practices
92
SEO
View project — Ray Martín

Ray Martín

Personal website in Next.js with Firebase CMS. Responsive design and SEO for personal branding.

96
Performance
100
Accessibility
100
Best practices
100
SEO
View project — Focus Crea

Focus Crea

Corporate site in Next.js with email capture. Responsive design, performance, and conversion.

100
Performance
100
Accessibility
100
Best practices
100
SEO
View project — Visa Nómada Digital

Visa Nómada Digital

Informational Webflow site focused on lead capture. Clear UX and SEO for digital visa queries.

95
Performance
100
Accessibility
96
Best practices
92
SEO
View project — Distribuciones Valeren

Distribuciones Valeren

Webflow ecommerce with catalog and checkout. Custom design, conversion optimization, and search visibility.

74
Performance
90
Accessibility
81
Best practices
100
SEO
View project — Asesorae

Asesorae

Webflow site for a professional consultancy. Custom design and lead generation optimization.

70
Performance
93
Accessibility
78
Best practices
100
SEO
View project — Arantxa & Jeannette Wedding

Arantxa & Jeannette Wedding

Event website built with Next.js and Tailwind. Invitations and RSVPs, responsive and search-optimized.

100
Performance
92
Accessibility
100
Best practices
100
SEO
View project — Asociación Equilibrio

Asociación Equilibrio

Institutional site built with React and Firebase. Forms, email automation, and accessibility improvements.

70
Performance
83
Accessibility
78
Best practices
100
SEO
View project — Advance Web

Advance Web

Web tool to audit performance, accessibility, and SEO. Clear UI and actionable metrics.

98
Performance
100
Accessibility
100
Best practices
100
SEO
View project — Amentibus Cultui Guild Website

Amentibus Cultui Guild Website

Community platform for gaming built with React and Strapi. CMS, PostgreSQL, and community-focused UX.

86
Performance
99
Accessibility
96
Best practices
100
SEO
View project — Investment Seeker

Investment Seeker

App for comparing crypto investment funds with React and TypeScript. Investment calculator and responsive design.

View project — Tokenomics

Tokenomics

Tool to analyze tokenomics with React and TypeScript. Market cap calculations and technical SEO.

Case studies

Selected engagements with measurable outcomes.

Context, approach, and Lighthouse scores that show quality and impact.

Aurantis

Fintech platform

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

Key metrics

Performance (Lighthouse)
78/100
Accessibility (Lighthouse)
95/100
Best practices (Lighthouse)
100/100
SEO (Lighthouse)
100/100
View project

4Pets Website

Pet health platform

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

Key metrics

Performance (Lighthouse)
88/100
Accessibility (Lighthouse)
95/100
Best practices (Lighthouse)
96/100
SEO (Lighthouse)
100/100
View project

Ray Martín

Personal brand website

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

Key metrics

Performance (Lighthouse)
96/100
Accessibility (Lighthouse)
100/100
Best practices (Lighthouse)
100/100
SEO (Lighthouse)
100/100
View project

Libraries

Open-source packages I publish to help teams move faster.

use-overflow-scroll

React

React hook to detect overflow and enable controlled scrolling.

@raymardev/react-native-intersection-observer

React Native

React Native library to detect element entry and exit with Intersection Observer.

Blog

Tutorials, guides, and best practices for developers.

View all articles

Methodology

Iterative process to deliver value with clarity, quality, and speed.

01

Discovery

Business, goals, users, and success metrics.

02

Design

Wireframes, UI, and architecture with states and validations.

03

Development

Short iterations, testing, and reusable components.

04

QA

Functional, accessibility, and performance review (CWV).

05

Delivery

Automated deployment, verification, and handoff.

06

Maintenance

Continuous improvement, analytics, and evolving roadmap.

FAQs

Clear answers about scope, timelines, and stack.

Do you include security, anti‑bots, and authentication?
Yes. I integrate anti‑bots, rate limiting, and OAuth (Google, Apple, GitHub) when it fits, prioritizing UX and conversion.
How long does a project take?
Between 2 and 6 weeks depending on scope, integrations, content, and validations.
What stack do you use?
Next.js, React, TypeScript, and Tailwind; Node.js, Prisma, and PostgreSQL; Stripe, Sumsub (KYC/AML), Magic Link/Web3; Vercel and CI/CD.
Do you offer maintenance and support?
Yes, with monthly plans including improvements, observability, updates, and support.
Do you use AI tools in your development workflow?
Yes. I leverage AI-assisted development with Cursor, Claude, and GitHub Copilot to accelerate delivery, improve code quality, and reduce iteration time without compromising control or security.
Do you build mobile apps?
Yes. I develop cross-platform iOS and Android apps with React Native and Expo, sharing code with web projects for faster delivery and lower costs.

Let’s grow your product

Performance, accessibility, and security that build trust and growth.

Download CV — EN (CTA)