Open to opportunities

itsmejoy Castro

@joycamilesurio

Message

Senior software engineer building scalable full-stack and backend systems.

Philippines

Message

What I'm looking for

I want a technical leadership role where I can modernize systems, mentor engineers, and build reliable, scalable cloud-native platforms.

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.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Cognizant Philippines

Mar 2021 - Present (5 years 3 months)

Led modernization of the Cognizant Philippines dashboard by migrating to TypeScript and React/Next.js, designed GraphQL federation and event-driven fraud workflows, and automated infrastructure with Terraform and Kubernetes to improve reliability and developer productivity.

TypeScript React Next.js Go GraphQL Kafka PostgreSQL Kubernetes Terraform

Senior Software Engineer

Sprout Solutions

Aug 2017 - Feb 2021 (3 years 6 months)

Drove migration from a Rails monolith to Java/Kotlin microservices, introduced GraphQL, and implemented a global payout system integrating Stripe Connect and PayPal to streamline payments and frontend integration.

Ruby on Rails Java Kotlin GraphQL React TypeScript MySQL Redis GCP

Full Stack Engineer

Pointwest Innovations

Oct 2014 - Jul 2017 (2 years 9 months)

Built microservices-based dispatch and surge pricing systems in Go and Node.js, owned driver incentives and earnings platforms with React dashboards, and designed real-time Kafka event pipelines to support lifecycle management.

Go Node React D3.Js Kafka Python Docker Mesos AWS

Software Engineer

Cisco Philippines

Jan 2013 - Sep 2014 (1 year 8 months)

Designed and implemented Java and Python ETL pipelines to ingest large-scale data, built analytics dashboards for enterprise clients, and optimized pipeline performance with multithreading and caching.

Java Python ETL Hadoop PostgreSQL Oracle Multithreading Data Visualization