About Javier
I'm a full-stack web developer specialised in building modern web
applications with AI capabilities integrated from the ground up.
What that means in practice: I help startups, SaaS products and
digital businesses go beyond standard software by embedding
intelligent features — AI chatbots that know your business,
autonomous agents that automate repetitive workflows, and
LLM-powered tools that save your team hours every week.
— What I build —
· Web applications with AI features: smart dashboards,
conversational interfaces, intelligent search
· RAG-based chatbots trained on your own documentation or data,
embedded directly into your product
· Autonomous AI agents (LangChain, CrewAI, n8n) that execute
tasks without human intervention
· API integrations with OpenAI, Anthropic Claude, Mistral and
other LLM providers
· End-to-end automation pipelines that eliminate manual,
repetitive work
— Who I work with —
Startups and scale-ups that want to add AI features to their
product. Digital SMEs that want to automate internal processes.
Product teams that need a developer who understands both the
engineering and the business impact.
— Why me —
Most developers can build you a web app. Far fewer can build one
that learns, responds and acts intelligently. I combine solid
full-stack engineering with hands-on experience deploying AI
systems in production — not just prototypes.
I care about measurable results, not just working code. Every
project I take on, I focus on one question: what does this save
you, or what does it generate for you?
— Tech stack —
Frontend: React, Next.js, TypeScript, Tailwind CSS
Backend: Node.js, Python, FastAPI, REST & GraphQL APIs
AI/Agents: OpenAI API, Anthropic Claude, LangChain, LlamaIndex,
n8n, RAG pipelines, vector databases (Pinecone, Chroma)
Databases: PostgreSQL, MongoDB, Supabase
Infra: Vercel, Railway, Docker, AWS (EC2, S3, Lambda)
Portfolio & projects: javipiqueras.dev
LinkedIn: linkedin.com/in/javipiquerasm
Spanish
Native or bilingual
French
Conversational
English
Fluent
Remote only
Primarily works remotely
Experience
- JPDevFreelance Software EngineerSOFTWARE PUBLISHINGJanuary 2026 - Today (5 months)Valencia, SpainAvailable for freelance and contract work as a Senior Full-Stack Engineer.Currently building:- radioassist — AI tool for radiology reporting (React, Node.js, PostgreSQL, Claude AI)Open to: product development, technical consulting, team augmentation.Stack: React · TypeScript · Node.js · NestJS · PostgreSQL · AWS · Docker→ Portfolio: javipiqueras.dev→ GitHub: github.com/javierpiquerasmartinez
- BNP Paribas Personal FinanceHead of Application Development and MaintenanceSOFTWARE PUBLISHINGFebruary 2019 - January 2026 (6 years and 11 months)Madrid, Spain- Directed technical architecture for mission-critical, multi-tenant web apps in automotive finance, using React/Angular (frontend) + Node.js/NestJS/Express (backend) + PostgreSQL/MongoDB/Redis.- Implemented scalable microservices and clean architecture, reducing latency and improving system reliability.Led code reviews and contributed production code in TypeScript/Node.js, enforcing comprehensive testing (Jest/Cypress) with >85% coverage.- Managed cloud deployments (AWS) with Docker/CI/CD, achieving zero-downtime updates and compliance with financial regulations.Optimized legacy Java components for high-availability, integrating with modern JS stacks.
- Altran InnovacionTechnical Expert - FullStack DeveloperSOFTWARE PUBLISHINGJanuary 2017 - January 2019 (2 years)Madrid, Spain- Developed B2B/B2C financial solutions using Angular/React (TypeScript), HTML5/CSS3 frontend, Java (Spring) backend, and Oracle databases.Implemented responsive UIs and APIs, improving user experience for multiple clients.- Collaborated on integrations, focusing on code quality and testing.
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Education
- Informatics and Software EngineeringUniversidad Politécnica de Valencia2017Informatics and Software Engineering
- Masters Degree in Informatics EngineeringUniversidad Complutense de Madrid2019Masters Degree in Informatics Engineering
Certifications
- Redis for Javascript DevelopersRedis University2024