Freelancers using PostgreSQL in Spain

Freelancers using PostgreSQL in SpainFreelancers using PostgreSQL in Spain

Projects People

proMálaga, Spain

Full Stack AI Engineer | Claude, AI Agents & Automation

$1k+: Earned

2x: Hired

5.0: Rating

32: Followers

Expert

Expert

+1

Full Stack AI Engineer | Claude, AI Agents & Automation

Cover image for Implementation of ZizkaDB for Decision Logging

Implementation of ZizkaDB for Decision Logging

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5

Cover image for Agentic AI Persona Chat (Replit)
Agentic

Agentic AI Persona Chat (Replit) Agentic AI Persona Chat (Replit) is an interactive AI chat application built on Replit that enables users to converse with specialized AI personas—such as a Helpful Assistant or Socratic guide—designed to reason, guide, and act autonomously based on user intent. The project showcases agentic behavior, modular personas, and real-time conversational intelligence in a developer-friendly environment.

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Cover image for Agentic AI Persona Chat (Replit)
Agentic

Agentic AI Persona Chat (Replit) Agentic AI Persona Chat (Replit) is an interactive AI chat application built on Replit that enables users to converse with specialized AI personas—such as a Helpful Assistant or Socratic guide—designed to reason, guide, and act autonomously based on user intent. The project showcases agentic behavior, modular personas, and real-time conversational intelligence in a developer-friendly environment.

2

222

Cover image for Workflow Automation and RAG Agent System for Canal Digital

Workflow Automation and RAG Agent System for Canal Digital

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pro03730 Xàbia, Spain

Senior Full-Stack Architect & Strategic Product Lead

$5k+: Earned

2x: Hired

9: Followers

Senior Full-Stack Architect & Strategic Product Lead

Cover image for Self-hosted Multi-User SaaS with Logic Overrides

Self-hosted Multi-User SaaS with Logic Overrides

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3

Cover image for AI SaaS Platform with Multi-User Accounts and Payments

AI SaaS Platform with Multi-User Accounts and Payments

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6

Cover image for Interactive Architectural Portfolio and System Simulator

Interactive Architectural Portfolio and System Simulator

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Cover image for AI Quoting Platform with Speech-to-Text & PDF Export

AI Quoting Platform with Speech-to-Text & PDF Export

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4

Matias Fourcade

Full Stack Web Engineer & UI/UX Designer

1x: Hired

6: Followers

Full Stack Web Engineer & UI/UX Designer

Cover image for Trellia full stack engineering

Trellia full stack engineering

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11

Cover image for Webflow Ecommerce

Webflow Ecommerce

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19

Cover image for Web design and webflow development

Web design and webflow development

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Cover image for Ravenscroft UI/UX designer and webflow development

Ravenscroft UI/UX designer and webflow development

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Roberto Nauzet Dorta Harteveld

Santa Cruz de Tenerife, Spain

Building Smart Web Apps and Automating Your Business Growth

New to Contra

Building Smart Web Apps and Automating Your Business Growth

Cover image for I developed a comprehensive real-time

I developed a comprehensive real-time inventory management system for modern e-commerce stores. The backend is built on a robust architecture using FastAPI and PostgreSQL, ensuring ultra-fast data processing with stable database connections. The admin panel monitors active user sessions, daily sales balances, and automatic syncing of physical/digital stock, reducing discrepancies to zero. Plus, the system features an optimized mobile payment flow, natively integrated with the Stripe Secure Checkout API to maximize sales conversions safely.

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15

Cover image for I developed a large-scale backend

I developed a large-scale backend automation solution for the real estate sector that collects, analyzes, and structures property metrics. The system uses the GPT-4o-mini model to process large volumes of market data by geographic location and autonomously generate executive analytical summaries. Once the AI processes the information, the system compiles the data into high-quality professional PDF documents ready to download. The entire infrastructure was modularized and containerized using Docker (v3.1), ensuring a clean, scalable, cost-efficient, and highly available cloud deployment for production environments.

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Cover image for I designed and implemented the

I designed and implemented the architecture of a business Artificial Intelligence Agent focused on automating support and capturing potential customers (Lead Generation). The core of the system uses OpenAI GPT-4o orchestrated with LangChain to inject custom context and dynamic knowledge bases. The data pipeline processes user interactions in milliseconds, syncs information in real-time with MongoDB databases, and sends qualified leads directly to the company's CRM. The project includes an advanced analytics dashboard that monitors the agent's performance, managing to maintain an optimal average response time of 1.8 seconds and operating 24/7.

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Cover image for Creation and layout of a

Creation and layout of a premium e-commerce platform focused on the retail and fashion sector. The frontend was developed from scratch using Next.js and TypeScript, prioritizing load speed, SEO optimization, and a smooth user experience on both desktop screens and touch mobile environments (100% responsive design). As an added value to boost conversion, I integrated a custom smart chat widget connected to language models (LLMs), which assists shoppers in real time by autonomously resolving questions about sizes, shipping, and product stock directly on the product page.

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Julian Somoza Zanuy

29500 Álora, Spain

Delivering tailored, scalable solutions with innovation.

Delivering tailored, scalable solutions with innovation.

Cover image for VirtualQueue

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7

Cover image for FORTE.IO

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4

Cover image for Molib at Ecrome Digital

Molib at Ecrome Digital

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5

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Patricia Osorio

Barcelona, Spain

Python Developer automating business workflows and building.

Python Developer automating business workflows and building.

Cover image for Development of AI Meal Planner for PatriEats

Development of AI Meal Planner for PatriEats

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2

Cover image for https://midnight-escale.web.app/ Firebase

https://midnight-escale.web.app/ Firebase

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Cover image for https://abogado-gentile.web.app/ Firebase

https://abogado-gentile.web.app/ Firebase

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Cover image for https://fenopharm.eu/ Website w. Firebase

https://fenopharm.eu/ Website w. Firebase

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Sebastiaan Wiechers

Data Engineering & Fullstack Expert 🚀

Data Engineering & Fullstack Expert 🚀

Cover image for Development of an AI-powered product configurator

Development of an AI-powered product configurator

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Cover image for Retrieval Augmented Generation (RAG) LLM Chatbot

Retrieval Augmented Generation (RAG) LLM Chatbot

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15

Cover image for Development of a custom ETL solution

Development of a custom ETL solution

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7

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agencra.xyz - Automated Pipelines. Ship in days, not weeks.

$5k+: Earned

27x: Hired

5.0: Rating

4: Followers

Expert

agencra.xyz - Automated Pipelines. Ship in days, not weeks.

Cover image for Yield-Nexus — Real-Time Crypto Portfolio

Yield-Nexus — Real-Time Crypto Portfolio & Trading Platform We built Yield-Nexus as a real-time crypto portfolio and trading dashboard aggregating data across Binance and Bybit. Traders needed a unified view of spot holdings, futures positions, and PnL without switching between exchange consoles.

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Cover image for Concordium — Supply Chain &

Concordium — Supply Chain & Testnet Infrastructure We delivered two blockchain projects for Concordium: a supply chain track-and-trace system and a testnet faucet. Track-and-trace: - Built a CIS-3 NFT smart contract (Rust) for product tracking. - Added sponsored transactions so users don’t need to hold tokens. - Implemented an indexer to track all on-chain movements in real time. - Shipped a full frontend and Docker-based infrastructure. Testnet faucet: - Developed a Next.js faucet with Cloudflare Turnstile bot protection. - Added per-address daily limits and balance checks via the explorer API. - Provided complete documentation for deployment and maintenance. Outcome: - Both systems production-ready and actively used. - 92 combined commits, clean architecture, ready-to-reuse patterns. This case shows our ability to ship end-to-end blockchain solutions—smart contracts, infrastructure, and UX—in one go.

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Cover image for NYC Watch Party Finder — From Idea to Production in 3 Days

NYC Watch Party Finder — From Idea to Production in 3 Days

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0

Cover image for Alephyr — Trading Engine with Evolutionary Optimization

Alephyr — Trading Engine with Evolutionary Optimization

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