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I'm Ruel Romeo M. Sintinta, a software engineer with 6+ years of experience specializing in backend development, API design, cloud migration, and large-scale fintech systems. I’m proficient in Java (8–21), Spring Boot, and distributed systems, and I also have hands-on experience with Go, containerization, and observability. I’m passionate about building scalable services, improving system performance, and mentoring teams to deliver clean, maintainable code. Currently at GCash, I’m leading modernization efforts, including upgrading over 100 applications to Java 21 using OpenRewrite and supporting Platform-as-a-Service (PaaS) migrations. I’m learning Go to orchestrate internal routing APIs, refining backend logic in Spring Boot, and exploring basic Docker containers with Kubernetes on AWS. I also provide architectural guidance for Alibaba’s User Domain (A+), and I leverage Prometheus, Grafana, and Datadog to monitor system health and performance.…I'm Ruel Romeo M. Sintinta, a software engineer with 6+ years of experience specializing in backend development, API design, cloud migration, and large-scale fintech systems. I’m proficient in Java (8–21), Spring Boot, and distributed systems, and I also have hands-on experience with Go, containerization, and observability. I’m passionate about building scalable services, improving system performance, and mentoring teams to deliver clean, maintainable code. Currently at GCash, I’m leading modernization efforts, including upgrading over 100 applications to Java 21 using OpenRewrite and supporting Platform-as-a-Service (PaaS) migrations. I’m learning Go to orchestrate internal routing APIs, refining backend logic in Spring Boot, and exploring basic Docker containers with Kubernetes on AWS. I also provide architectural guidance for Alibaba’s User Domain (A+), and I leverage Prometheus, Grafana, and Datadog to monitor system health and performance.

Ruel Romeo M. Sintinta

Back-End Developer, Full Stack Developer, Web Developer, +2

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I'm Ruel Romeo M. Sintinta, a software engineer with 6+ years of experience specializing in backend development, API design, cloud migration, and large-scale fintech systems. I’m proficient in Java (8–21), Spring Boot, and distributed systems, and I also have hands-on experience with Go, containerization, and observability. I’m passionate about building scalable services, improving system performance, and mentoring teams to deliver clean, maintainable code. Currently at GCash, I’m leading modernization efforts, including upgrading over 100 applications to Java 21 using OpenRewrite and supporting Platform-as-a-Service (PaaS) migrations. I’m learning Go to orchestrate internal routing APIs, refining backend logic in Spring Boot, and exploring basic Docker containers with Kubernetes on AWS. I also provide architectural guidance for Alibaba’s User Domain (A+), and I leverage Prometheus, Grafana, and Datadog to monitor system health and performance.…I'm Ruel Romeo M. Sintinta, a software engineer with 6+ years of experience specializing in backend development, API design, cloud migration, and large-scale fintech systems. I’m proficient in Java (8–21), Spring Boot, and distributed systems, and I also have hands-on experience with Go, containerization, and observability. I’m passionate about building scalable services, improving system performance, and mentoring teams to deliver clean, maintainable code. Currently at GCash, I’m leading modernization efforts, including upgrading over 100 applications to Java 21 using OpenRewrite and supporting Platform-as-a-Service (PaaS) migrations. I’m learning Go to orchestrate internal routing APIs, refining backend logic in Spring Boot, and exploring basic Docker containers with Kubernetes on AWS. I also provide architectural guidance for Alibaba’s User Domain (A+), and I leverage Prometheus, Grafana, and Datadog to monitor system health and performance.

Available to hire

I’m Ruel Romeo M. Sintinta, a software engineer with 6+ years of experience specializing in backend development, API design, cloud migration, and large-scale fintech systems. I’m proficient in Java (8–21), Spring Boot, and distributed systems, and I also have hands-on experience with Go, containerization, and observability. I’m passionate about building scalable services, improving system performance, and mentoring teams to deliver clean, maintainable code.

Currently at GCash, I’m leading modernization efforts, including upgrading over 100 applications to Java 21 using OpenRewrite and supporting Platform-as-a-Service (PaaS) migrations. I’m learning Go to orchestrate internal routing APIs, refining backend logic in Spring Boot, and exploring basic Docker containers with Kubernetes on AWS. I also provide architectural guidance for Alibaba’s User Domain (A+), and I leverage Prometheus, Grafana, and Datadog to monitor system health and performance.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Javanese

Fluent

Bashkir

Intermediate

Work Experience

Manager Software Engineer (Sr. Java Developer) at G-Exchange, Inc. (GCash)

April 1, 2023 - Present

Leads and supports a development team by assigning tasks, guiding development processes in non-production environments, processing access requests, performing code reviews, and resolving SonarQube and SAST issues. Utilizes GitHub Copilot to enhance code quality and productivity. Oversees large-scale modernization projects, including upgrading over 100 applications to Java 21 using OpenRewrite and supporting Platform-as-a-Service (PaaS) migration. Prototyping Go (Golang) for API orchestration, improving backend API performance in Spring Boot, and implementing basic Docker-based containerization and initial Kubernetes concepts on AWS. Provides architectural input for A+ Alibaba architecture in the User Domain to ensure scalability. Implements monitoring with Prometheus, Grafana, and Datadog to visualize real-time metrics and API health.

Lead Software Engineer (Mid Java Developer) at G-Exchange, Inc. (GCash)

April 1, 2023 - October 20, 2025

Participated in system design for customer-, merchant-, and operator-facing projects, ensuring scalable architectures and smooth service integration. Developed reusable APIs consumed by internal services such as bank integrations, insurance systems, and promotional platforms; authored API documentation and internal guides for middleware and Alibaba tools to support onboarding during migration. Investigated and resolved production issues, performed Linux-based scripting for minor data corrections, and contributed to performance testing in high-usage periods. Experience with Kafka for log streaming and Redis for caching, and adapted to an Agile environment post-migration.

Associate Software Engineer at G-Exchange, Inc. (GCash)

April 1, 2021 - October 20, 2025

Developed Mule ESB APIs for transforming SOAP to JSON as part of a large-scale system migration. Built applications using SofaBoot and Maven, deployed on Alibaba Cloud with middleware tools like DRM for dynamic configuration and traffic control. Worked with Java 8, iBatis for persistence, and MySQL. Applied the Facade design pattern to simplify subsystem interactions and supported Domain-Driven Design (DDD) practices. Implemented unit tests with JUnit and iTestMNG, achieving high code coverage; leveraged Alibaba monitoring tools and Alibaba MessageQueue for real-time event history and downstream processing.