itsmejoy Castro

I am a senior software engineer with over 12 years of experience building large-scale full-stack and backend systems across payments, microservices, and cloud-native platforms. I specialize in React, TypeScript, Go, Python, Ruby on Rails, and Java, and I have repeatedly led migrations and platform modernizations. I have designed GraphQL federations, event-driven fraud and chargeback workflows, and global payout systems integrating Stripe Connect and PayPal, while improving performance with sharding, caching, and query optimization. I automate infrastructure with Terraform and Kubernetes and enhance observability using Prometheus and Grafana. I mentor engineers, guide onboarding, and partner with product and design teams to deliver production systems that scale to millions of users and billions of transactions. I seek roles where I can continue to lead technical migrations, improve system reliability, and grow engineering teams.