Architecting AI Foundations

David Castillo

Senior Backend Engineer & AI Solutions Architect

Software Engineer specializing in scalable architectures and advanced Conversational AI systems.

Expert in Event-Driven Architectures (EDA), Retrieval-Augmented Generation (RAG) over vector databases, and orchestrating intelligent agents with LangGraph.

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Curated technical deep dives, architectural blueprints, and full-stack AI implementations.

01 / Infrastructure

Projects

Selected work demonstrating expertise in backend architecture, AI systems, and cloud infrastructure.

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Network Uptime99.99%

Tech Stack

Technologies and tools I use to build production-grade systems at scale.

About

Senior software engineer with 10+ years building scalable systems, cloud infrastructure, and AI-powered platforms.

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Domain Expertise

Expertise

Backend Architecture

Node.js, Python 3.13, FastAPI, Domain Event Bus, Redis Pub/Sub.

Cloud & DevOps

Google Cloud Run, Cloud Tasks, GitHub Actions, Docker, Serverless CI/CD.

AI & LLMOps

LangGraph, LangChain, Google Gemini 2.0, OpenAI API, RAG, Atlas Vector Search.

Database Design

MongoDB, Beanie ODM, Redis Caching, NoSQL, Vector Databases.

Building the future of AI and scalable systems.

Available for challenging projects and technical leadership.