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I am a backend developer with over 2 years of experience building modern web applications. I specialize in Node.js, NestJS, and TypeScript, with strong experience in relational and non-relational databases (PostgreSQL, MongoDB), creating scalable, maintainable, and production-ready solutions. I also work comfortably with React and Next.js on the frontend when a project requires full-stack delivery. Whether you need a SaaS application, dashboard, internal tool, AI integration, or custom web platform, I can help transform your ideas into reliable software. I build complete web applications including: • Modern frontend development with React and Next.js • Backend APIs using Node.js and TypeScript • Authentication (JWT, OAuth) • Database design with PostgreSQL • REST API development and third-party integrations • Responsive and user-friendly interfaces • Performance optimization and scalable architectures Technical Skills Frontend • React • Next.js • TypeScript • Tailwind CSS • HTML5 / CSS3 / JavaScript Backend • Node.js • Express • PostgreSQL • Redis • REST APIs • Authentication Integrations • Stripe • OpenAI API • Email services • Webhooks • Third-party APIs What You Can Expect ✓ Clean and maintainable code ✓ Clear communication throughout the project ✓ Scalable and production-ready solutions ✓ Attention to performance and user experience ✓ Reliable delivery focused on your business goals I'm always interested in building products that solve real problems and create value for users.

As a skilled Software Engineer with 10+ years in Full Stack Web Development, My strongest core role is a python developer for backend-heavy products, with additional experience in C# .NET when projects require enterprise-grade backend logic. When the scope expands, I work as a full stack developer with end-to-end ownership, or as a web developer focused on scalable execution. 📌 What I typically cover Web and Mobile Development backed by 10+ years of product work, supported by a full stack developer approach when APIs and UI must evolve together Full-Stack Development aligned into 1 clear delivery flow, shaped through python full stack thinking for faster releases and fewer handoff gaps E-commerce Web Development across 3 core layers - business logic, integrations, and user flows - delivered with full stack python experience API development and Integration for internal platforms and 3rd-party systems, handled in a full stack developer python role when architecture must stay practical ⚙️ My current capability set covers React with JavaScript, Next.js, Nest.js and TypeScript, plus Vue.js and Angular. On the backend, I work with Node.js, laravel, python, Django, Flask, .NET, C++, Go, Ruby on Rails and Java. Mobile and cloud delivery includes iOS, Android, flutter, React Native, AWS, Azure, GCP, Docker, Kubernetes, and openstack. I also support CMS and platform work through wordpress, Drupal, Symfony, Magento and Shopify. 🛠️ Delivery across product layers Lean API products often benefit from a python full stack developer flask setup User-facing systems need a full stack web developer mindset when flow affects adoption Interface-heavy platforms grow faster with a full stack developer react profile Cross-layer execution works well in a full stack developer react python environment System reliability improves early with a backend python developer focus 🤖 I build AI features for real workflows, not for demo value alone. In that context, I work as a python ai developer on assistants, automation and internal tools. My python ai work is strongest where adoption matters, and clients also bring me in as an ai developer or ai software developer when implementation must connect product, backend, and rollout. 🧠 AI, frontend, and product execution ✔️Practical ai machine learning features tied to support, search, and operations ✔️Applied machine learning developer work when smart functionality must fit an existing product ✔️Business-facing machine learning integrations designed for measurable value ✔️Custom chatbot systems built with react python flows and fastapi services ✔️Scalable UI delivery as a react developer with clean html front end execution and thoughtful app design ☁️ I stay close to architecture because strong delivery depends on clear ownership. That is why I regularly handle back end development, step in as a backend developer when technical decisions affect release quality, and support python devops workflows across cloud and deployment planning. 🔧 Collaboration and adjacent exposure In a startup, delivery often means working beside a data scientist, then translating that work with a product manager into usable features. Release quality improves when a qa analyst joins early, especially in products shaped by compliance. Some founders also involve me as a startup consultant before code begins. ✔️Broader platform exposure includes sharepoint workflows, material ui dashboards, payment gateway implementation ✔️Cross-team delivery has also touched full stack java environments and adjacent java devops processes. ✔️Finance-related work has included trading python flows, algorithmic trading logic, binance integrations, and tools built for a trader. ✔️Adjacent product contexts have involved data entry operations, support for a journalist workflow, technical resume writing solutions, selected dall-e use cases, prototype work around crypto bot ideas, and tools requested by gaming developers. ✔️Growth-focused engagements may also involve a seo specialist, a practical it consultant, or teams building in marketing saas. 🌍 My domain expertise includes AI Startups, Data Analytics, Healthcare, Fintech, E-commerce agencies, IT Consulting/Softdev companies, Real Estate, Non-Profit, Blockchain and Gambling 🤝 If you need senior technical ownership Full Stack Developer, fast ramp-up and delivery that stays aligned with business goals, let’s talk."

I build production-grade AI systems: LLM applications, RAG pipelines, AI agents, enterprise knowledge graph and expert systems, and the backend infrastructure required to make them reliable. I’m a senior software engineer with 20 years of professional experience across full-stack development, distributed systems, real-time applications, cloud infrastructure, and complex integrations. Over the last several years, my work has focused on LLM infrastructure, LangChain/LangGraph, OpenAI APIs, semantic systems, RDF/JSON-LD, Neo4j, vector search, and production AI workflows. My strength is not just building AI demos. It is turning ambiguous product ideas into maintainable, scalable systems with clear architecture, reliable data flow, strong backend foundations, and production-ready implementation. Recent work includes: architecting AI orchestration systems with LangGraph, building RAG pipelines with structured retrieval and tool execution, designing graph-based knowledge systems using RDF, JSON-LD, and Neo4j, creating scalable event-driven backends on AWS, developing real-time AI-powered applications, integrating complex third-party APIs and data sources, improving reliability, performance, and maintainability of existing systems. Clients typically bring me in when they need: AI agents and autonomous workflows, Retrieval-Augmented Generation, LangChain/LangGraph architecture, LLM orchestration and tool execution, knowledge graphs and semantic data models, graph and vector-based retrieval systems, AI workflow automation, scalable Node.js/TypeScript backends, real-time and event-driven systems, AWS serverless and cloud-native infrastructure, technical leadership on complex or ambiguous projects. I have worked exclusively as a full-time freelancer for more than 10 years. I’m used to taking ownership, communicating clearly, adapting quickly to existing teams, and delivering reliable systems without heavy supervision. Best fit: complex AI/backend projects where architecture, reliability, and long-term maintainability matter more than quick demos. ⸻ Core Expertise AI & LLM Systems: LangChain, LangGraph, LangSmith, OpenAI APIs, AI agents, tool orchestration, RAG pipelines, vector search, structured outputs, prompt engineering, streaming LLM applications, AI workflow automation. Knowledge Graphs & Semantic Systems: RDF, JSON-LD, Neo4j, graph databases, semantic data modeling, knowledge graph architecture, graph and vector retrieval, entity modeling, data integration. Backend & Infrastructure: Node.js, TypeScript, Python, NestJS, Express, Koa, GraphQL, REST APIs, WebSockets, PostgreSQL, Redis, DynamoDB, Elasticsearch, RabbitMQ, AWS, Docker, Kubernetes, Terraform. Frontend: React, Next.js, Redux, Apollo GraphQL, Relay, Storybook, real-time collaborative interfaces. ⸻ Technology Stack TypeScript, JavaScript, Python, Node.js, React, Next.js, NestJS, Express, GraphQL, REST, WebSockets, PostgreSQL, MongoDB, Redis, DynamoDB, Elasticsearch, RabbitMQ, AWS Lambda, API Gateway, S3, IAM, CloudFormation, Docker, Kubernetes, Helm, Terraform, LangChain, LangGraph, LangSmith, OpenAI APIs, RDF, JSON-LD, Neo4j, vector search, Jest, Cypress, Selenium, Puppeteer.

👨‍💻 About Me I'm a Senior Software Engineer & Technical Leader with over 7 years of experience delivering scalable, high-performance web applications and APIs. I specialize in Next.js, React, NodeJS, .NET Core and Angular. 🧩 Core Skills Frontend: React, Angular, Next.js, Bootstrap, MUI Datagrid, Tailwind CSS Backend: .NET Core, Node.js Databases: SQL Server, MongoDB, Redis Dev Tools: Git, Azure DevOps, Docker, CI/CD pipelines 🔌 API Integration Expertise I have extensive experience integrating third-party services like: Stripe (payments) Calendly (scheduling) Auth0 (authentication) Facebook API (social platforms) These integrations are implemented with performance, security, and long-term maintainability in mind. 👥 Leadership Experience As a Technical Leader, I’ve: Led a team of 10 developers on an e-commerce builder platform Designed software architecture and improved backend performance Prioritized product requirements with stakeholders Conducted code reviews and mentored junior developers ✅ What You Can Expect Clean, maintainable code Reliable API integrations Performance-focused backend systems Clear communication and on-time delivery Let’s work together to bring your product vision to life!

As a Director of Technology, Leonardo combines deep technical expertise with strategic leadership. He excels at building resilient backends, driving architecture decisions, and aligning technology with business goals. Leonardo is a Senior Java Developer and AWS Certified Solutions Architect with 15+ years of experience designing cloud-native systems and leading cross-functional teams. He has delivered scalable, mission-critical platforms for high-growth startups and enterprises across Latin America. 🔹 Java, Spring Boot, REST APIs, Hibernate, Maven, Gradle 🔹 AWS (EC2, S3, Lambda, Route 53, CloudFront, IAM, CloudWatch, ECS, ECR, Load Balancers) 🔹 Microservices, RabbitMQ, asynchronous/event-driven architecture 🔹 MySQL, PostgreSQL, SQL optimization, Redis, Liquibase 🔹 CI/CD pipelines, Docker, Git, Bash scripting, Linux administration 🔹 Reporting & analytics: Tableau, Power BI, MyDBR, complex SQL views 🔹 Team leadership, agile delivery, digital transformation, mentoring tech teams

Is your PrestaShop store broken, slow, or missing a key feature? I'll fix it — fast, clean, and with clear communication throughout. I'm a PrestaShop specialist and Full Stack Developer with 5+ years of hands-on experience building custom modules, migrating stores, configuring VPS servers, and solving complex bugs in production environments. I currently work as a Software Engineer at Mercado Libre — Latin America's largest tech company — which means I build and maintain systems at scale every day. On Upwork: 100% Job Success Score, Rising Talent badge, and a track record of delivering on time and communicating proactively. ────────────────────────────────── PRESTASHOP — What I can do for you: ────────────────────────────────── ✔ Custom module development (PS 1.6 / 1.7 / 8.x) ✔ Theme customization & complete store redesigns ✔ VPS setup, NGINX/Apache configuration & SSL ✔ Store migrations (version upgrades or server changes) ✔ Bug fixes: cache conflicts, session errors, white screens, hook issues ✔ Performance optimization (Redis, caching layers, DB queries) ✔ Payment gateway & third-party API integrations ────────────────────────────────── FULL STACK — Beyond PrestaShop: ────────────────────────────────── ✔ React / Next.js frontends (Redux Toolkit, Zustand) ✔ PHP backends with Symfony ✔ Node.js / Express APIs ✔ .NET 8 + Entity Framework + Microservices ✔ MySQL, PostgreSQL, Redis, ElasticSearch ✔ CI/CD pipelines with GitHub Actions & Docker ────────────────────────────────── WHY CLIENTS CHOOSE ME: ────────────────────────────────── → I respond within 4 hours and keep you updated at every stage → I write clean, documented code — not quick patches that break later → I've handled both small urgent fixes and long-term development projects → English (conversational) + Spanish (native) — no communication barriers Whether you need a quick bug fix or a full store rebuild, I'll make sure the job is done right. Let's talk about your project.