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Sebastián
Diez.
Sebastián Diez
👋

Full Stack Developer

Pamplona, Spain

Building fast, elegant web products — from idea to production.

Hire meThings I've shipped.
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01 / About

Developer with a product mindset.

I'm a full stack developer with 5+ years crafting web applications for startups and tech companies. I specialize in React, Node.js, and TypeScript, and I care about clean architecture, performance, and interfaces that feel exactly right.

Experience

5+ years

Projects

20+

Focus

Web & APIs

Clean architecturePerformance-firstClear communicationOn-time delivery

02 / Experience

Where I've worked.

Oct 2025 — Present

TDN Clínica ↗

Software Developer

Desarrollo de proyecto de I+D BioAncient del Gobierno de Navarra. Desarrollo completo de una aplicación de gestión interna para el personal, pacientes, citas, etc.

Oct 2024 — Jun 2025

RecanorSL ↗

Software Developer

Desarrollo de un SAAS y CRM para talleres de automoción. Creación de modulos para Dolibarr, Prestashop y WordPress.

Jan 2024 — Jun 2025

Sumitomo Electric Bordnetze ↗

Software Developer

Mantenimiento de app web de gestión interna de las plantas de Sumitomo. Desarrollo completo de una app para gestion de personal; bajas, vacaciones, turnos, teletrabajo, etc.

03 / Projects

Things I've shipped.

Wealth Aura Funded 1Wealth Aura Funded 2

Prop firm platform with 1- and 2-step challenge evaluation. Features risk metric monitoring (drawdown, profit targets, consistency), HFT support, MetaTrader 5 integration, real-time performance dashboard, and automated withdrawal management.

NextJSPostgreSQLSpringBoot
2026

Wealth Aura Funded

Substrick 1

iOS/Android app to track subscriptions (individual and group) with price-sharing features and AI-powered alternative suggestions.

ExpoTypeScriptSupabasePostgreSQLPrismaRecharts
2025

Substrick

Trato Motor 1

Vehicle marketplace with a seller admin panel, Stripe payment integration, and an automated onboarding system.

Node.jsTypeScriptDrizzleORMPostgreSQLStripe
2026

Trato Motor

OnlyTraders 1

Social trading app with real-time charts, broker API integrations, and tools to follow and copy successful traders.

Next.jsTypeScriptSpringBootJavaPostgreSQLDocker
2026

OnlyTraders

Iruman 1Iruman 2

Landing page for a gas and oil boiler business in Navarra. Showcases their technical service and installation offerings across the region.

Next.jsTypeScript
2026

Iruman

03 / Skills

My toolkit.

Languages

TypeScriptTypeScriptJavaScriptJavaScriptPythonPythonSQLJavaJavaC#

Frontend

ReactReactNext.jsNext.jsTailwind CSSTailwind CSSZustandTanStack QueryTanStack QueryRecharts

Backend

SpringBootSpringBootFastAPIFastAPIPostgreSQLPostgreSQLMySQLMySQLRedisRedisDrizzleORMDrizzleORM

Infrastructure

DockerDockerVercelVercelGitHub ActionsGitHub ActionsSupabaseSupabase

Tools

GitGitFigmaFigmaPostmanPostmanClaude CodeClaude CodeLinuxLinux

04 / Contact

Let's build something together.

I'm available for freelance projects, consulting, and full-time positions. If you have an idea or a role that fits, I'd love to hear from you.

Send me an email
Find me at

© 2026 Sebastián Diez

Pamplona, Spain