Description

I am a results-driven Backend Developer specializing in building scalable Node.js server architectures, custom API integrations, and AI-driven workflow automations.

My workflow is heavily optimized for speed and agile delivery. By combining cutting-edge AI-assisted development tools with meticulous human quality control, debugging, and robust unit testing, I deliver secure, production-ready backend solutions on tight deadlines. If your business needs to optimize internal operations, ingest data, or scale API connections, I am equipped to handle high-volume backend workflows efficiently.

Here is what I bring to the table:

• Backend & API Excellence: Design and deployment of clean, modern, and high-performance Node.js RESTful/GraphQL APIs.

• AI & Automation Integration: Smooth implementation of LLMs (OpenAI, Anthropic), Vector Databases (ChromaDB, Qdrant), and RAG systems to automate manual tasks.

• Privacy & Security: Code built with data protection principles in mind, ensuring compliance-ready solutions for the European market.

• Speed & Scale: Optimized server logic and databases built to handle complex data without compromising performance.

Technical Stack:

• Languages & Runtimes: Node.js, JavaScript (ES6+), TypeScript, Python, C++, C#

• Frameworks & Libraries: Express.js, Fastify, LangChain

• Databases & AI Tools: MongoDB, PostgreSQL, Vector DBs, OpenAI API

• DevOps & Control: Git / GitHub, Docker, Postman

I am a registered freelancer based in Europe, meaning I can start immediately and adapt easily to fast-paced environments or ongoing distributed workflows.

Let's connect and optimize your next high-performing backend or AI project!

Languages

Spanish
Native or bilingual
Catalan
Conversational
English
Fluent
Portuguese
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Remote (EU)
Independent Freelance & AI Developer
January 2025 - Today (1 year and 6 months)
•Engineered an interactive, local Retrieval-Augmented Generation (RAG) system using Node.js and OpenAI's GPT-4o-mini to automate support workflows, cutting response times to under 3 seconds.
•Optimized OpenAI API token consumption by 40% by implementing cus tom local TF-IDF semantic filtering on client payloads prior to context injection.
•Designed and exposed robust REST endpoints fully compliant with Ope nAPI standards, ensuring seamless integration with frontend clients.
•Implemented 100% test coverage using Jest and Supertest for mission critical routing layers, ensuring resilient error handling.
•Created a premium dark-themed HTML5 dashboard featuring native browser-level screen recording to capture pipeline flows for stakeholder demos.
Full
Node.js JavaScript C# Python C++
Independent
Stack Developer
DIGITAL AND IT
January 2023 - December 2024 (1 year and 11 months)
Barcelona, Spain
• •Developed and optimized backend microservices using JavaScript/Type Script, improving overall application processing speeds and server relia bility.
• •Automated repetitive manual operations by developing custom Python data pipelines, reducing weekly database management overhead.
• •Managed source control, branch integration, and production releases via Git/GitHub inside agile Scrum development environments.