David Castillo

Backend Engineer · AI Systems Developer · Cloud Architect

I design and build scalable backend systems, AI-powered platforms, and cloud-native architectures.

Over 10 years of experience architecting distributed systems, event-driven platforms, and SaaS products that handle real-world scale.

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Tech Stack

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Projects

Featured projects and recent work

About

My philosophy and approach

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Areas of Expertise

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Backend Systems

Node.js, TypeScript, distributed systems, REST APIs

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Cloud Architecture

Cloudflare, GCP, serverless, infrastructure as code

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AI Systems

LangChain, LangGraph, agents, vector search, RAG

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System Design

Event-driven, microservices, scalable platforms

Scalable systems. Clean architecture. Pragmatic engineering.

Backend · AI · Cloud · Distributed Systems