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Diego Alberto Castillo

@diegoalbertocastillo

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Senior software engineer specializing in scalable backend systems and AI-driven microservices.

Argentina

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What I'm looking for

I’m looking for a Senior role where I can architect scalable backend and event-driven systems, strengthen observability and reliability, and apply AI/LLM workflows (like RAG) to drive real operational insights.

I’m a Senior Software Engineer with 10 years of experience designing and building scalable backend systems, distributed services, and cloud-native platforms. I specialize in microservices architecture, observability/telemetry pipelines, and event-driven systems, with hands-on expertise across AWS, GCP, and Azure.

In my recent roles, I’ve architected backend services with Django and FastAPI, built TypeScript orchestration services, and implemented event-driven pipelines with RabbitMQ and AWS SQS. I also develop AI-powered workflows using LangChain, OpenRouter, LangFuse, and RAG pipelines (vector databases + LLMs) to deliver semantic search, contextual Q&A, and AI-assisted analytics—while maintaining strong reliability through testing standards (90%+ coverage) and CI/CD automation.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

SWL - Software League LLC

Feb 2022 - Feb 2026 (4 years)

Architected distributed backend services in Django/FastAPI for financial, analytics, and AI workloads, building event-driven pipelines with RabbitMQ and AWS SQS and implementing AI workflows with LangChain and LangFuse. Designed REST/GraphQL APIs with multi-database persistence, implemented JWT/OAuth2 security, and maintained unit/integration/E2E testing standards above 90%.

Django fastAPI Microservices RabbitMQ SQS Lang Chain Langfuse PostgreSQL Kubernetes

Senior Full Stack Engineer

Exquisite Software

Oct 2020 - Feb 2022 (1 year 4 months)

Built scalable SaaS backend services with FastAPI and TypeScript Node.js, delivering GraphQL gateways and REST APIs backed by PostgreSQL, Redis, DynamoDB, and Elasticsearch. Automated CI/CD with Jenkins, Docker, and Kubernetes to improve deployment speed by 40%, while expanding test coverage and reducing production defects by 30%.

fastAPI GraphQL TypeScript Kafka PostgreSQL Redis DynamoDB Scrapy Playwright CI CD

Full Stack Engineer

ReadySpace

Aug 2016 - Oct 2020 (4 years 2 months)

Developed Flask/Django backend services and frontends with React/Next.js and Vue/Nuxt, introducing Docker-based development workflows and Kubernetes orchestration. Built ETL and web-scraping data ingestion using RabbitMQ, Kafka streams, and Redis, optimizing processing to reduce reporting latency by 60% while maintaining 90%+ test coverage.