Freelance Fullstack Engineers in Madrid

Freelance Fullstack Engineers in MadridFreelance Fullstack Engineers in Madrid

Projects People

AI & SaaS Developer with Product Expertise

AI & SaaS Developer with Product Expertise

Cover image for Developing an AI-Powered Tool for Gathering Customer Feedback

Developing an AI-Powered Tool for Gathering Customer Feedback

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12

Cover image for Developing a Chatbot and Widget for Property Managers

Developing a Chatbot and Widget for Property Managers

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8

Cover image for Chrome Extension for Scheduling Meetings Globally

Chrome Extension for Scheduling Meetings Globally

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11

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Fullstack Engineer(2)

Innovative tech strategist.

Innovative tech strategist.

Cover image for Technical lead | Healthcare Software, AWS Architecture

Technical lead | Healthcare Software, AWS Architecture

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11

Cover image for Founder & Managing Director | Full-Stack Development

Founder & Managing Director | Full-Stack Development

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6

Cover image for CTO & Development Lead | AWS Architect, SaaS Development, Java

CTO & Development Lead | AWS Architect, SaaS Development, Java

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3

Cover image for Snr Consultant United Nations | Java, Spring Boot, React, Grails

Snr Consultant United Nations | Java, Spring Boot, React, Grails

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30

Fullstack Engineer(3)

Berckan Guerrero

pro

14+ years building fast, accessible websites. AI Friendly.

1x: Hired

5.0: Rating

7: Followers

14+ years building fast, accessible websites. AI Friendly.

Cover image for PartSpace: B2B SaaS marketing website

PartSpace: B2B SaaS marketing website for the manufacturing sector, built with Nuxt 4 and Storyblok. Developed 100+ reusable CMS components, integrated real-time commodity pricing via FRED API, implemented strict Content Security Policy (CSP) with enterprise-grade security headers, and delivered full English/German localization with 8 dynamic sitemap variants. Delivered during my time at Yumeda Studio.

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545

Cover image for Where Are They? (dondeestan.cl):

Full-stack platform

Where Are They? (dondeestan.cl): Full-stack platform built on Supabase PostgreSQL from the ground up. Designed and implemented the complete database architecture: 63 migrations, Row Level Security (RLS) policies, full-text search with Spanish stemming, and incremental data sync using SHA-256 change detection. The project aggregates 3,216+ records from 4 external sources through a Python ETL pipeline with 99% deduplication accuracy, AI-powered image restoration (Real-ESRGAN + GFPGAN), and a Nuxt 3 frontend. Hosted on GitHub with a monorepo structure, CI/CD via GitHub Actions, and Vercel deployment. This project demonstrates deep Supabase expertise: auth, storage, database design, RLS, edge functions, and seamless integration with a modern frontend stack.

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354

Cover image for THE SPOT:
Ongoing maintenance and

THE SPOT: Ongoing maintenance and DevOps for Germany's leading film industry news service. Delivered during my time at Yumeda Studio. Security hardening, custom PHP plugin development, infrastructure management, and performance optimization that took PageSpeed from 54 to 99.

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353

Cover image for berck.io: personal portfolio with multilingual

berck.io: personal portfolio with multilingual support (EN/ES/FR), personalized client pages, and Supabase-powered private portals. Built for speed: Islands architecture with partial hydration and a 72% reduction in asset size.

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330

Fullstack Engineer(5)

Fullstack Engineer: AI-Driven Solutions

11: Followers

Fullstack Engineer: AI-Driven Solutions

Cover image for Tequeño Studios | Agencia Digital Creativa

Tequeño Studios | Agencia Digital Creativa

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1

Cover image for Auratify

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1

Cover image for Pekebyte.com

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2

Cover image for Size Wizard - Shopify App

Size Wizard - Shopify App

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0

Fullstack Engineer(2)

Software Engineer: Building Awesome Webs Apps & Products

Software Engineer: Building Awesome Webs Apps & Products

Cover image for CTO, OpenBroker.com

CTO, OpenBroker.com

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13

Cover image for Full-stack developer – OB Studio

Full-stack developer – OB Studio

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8

Cover image for Lead Engineer, eth-roulette.com

Lead Engineer, eth-roulette.com

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6

Cover image for CTO, Subletny.com

CTO, Subletny.com

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13

Fullstack Engineer(2)

Paloma Dominguez

Customer Success, Product & Growth | Scaling B2B SaaS

Customer Success, Product & Growth | Scaling B2B SaaS

Cover image for Full-Stack Development for obesity tracking platform

Full-Stack Development for obesity tracking platform

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Cover image for Scaling Contestia – Growth & Customer Success Strategy

Scaling Contestia – Growth & Customer Success Strategy

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Cover image for Co-Designing a Mixed Reality Learning Experience

Co-Designing a Mixed Reality Learning Experience

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11

Cover image for Enhancing SaaS UX & Retention

Enhancing SaaS UX & Retention

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7

Fullstack Engineer(1)

Facundo Cappella

Tech Lead | Solution Architect | AI Engineer

116: Followers

Tech Lead | Solution Architect | AI Engineer

Cover image for Rate My Idea

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1

Cover image for RAG Solutions - Agent Platform

RAG Solutions - Agent Platform

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🚀 Pomelo AI is live in production! Pomelo AI, a platform that helps teams transform their brand’s DNA into authentic, consistent, and on-brand content… powered by AI 🤖🍊 It's currently in beta and actively looking for real feedback to keep improving. 👉 Free to use.

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Cover image for AI-powered assistant for analyzing chat

AI-powered assistant for analyzing chat sentiment and extracting insights from conversations. live demo: http://agent-assistant-alb-1868298832.us-east-1.elb.amazonaws.com/ repo: https://github.com/fsystemweb/chat-sentiment-analysis

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155

Fullstack Engineer(2)

Custom Web Solutions: From Concept to Code

Custom Web Solutions: From Concept to Code

Cover image for Truckbays

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15

Cover image for Sibucán

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6

Cover image for SwagUp

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8

Cover image for Trincico

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7

Fullstack Engineer(2)