Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I'm Francisco III Castro, a Senior Java Backend Engineer with over 10 years of experience designing and implementing scalable and high-performance backend systems. I have a strong passion for leveraging microservices architecture, cloud-native solutions, and real-time data synchronization to deliver business-critical solutions that make a difference. I enjoy collaborating with cross-functional teams and mentoring junior developers to drive innovation and optimize system performance. Throughout my career, I have worked with industry-leading clients in banking, media, and e-commerce, mastering technologies like Spring Boot, AWS, Kubernetes, Docker, and GraphQL. I'm always eager to learn and apply best practices like test-driven development to craft maintainable, clean code. When I'm not coding, I love finding new ways to enhance user experiences and streamline backend systems.…Hi, I'm Francisco III Castro, a Senior Java Backend Engineer with over 10 years of experience designing and implementing scalable and high-performance backend systems. I have a strong passion for leveraging microservices architecture, cloud-native solutions, and real-time data synchronization to deliver business-critical solutions that make a difference. I enjoy collaborating with cross-functional teams and mentoring junior developers to drive innovation and optimize system performance. Throughout my career, I have worked with industry-leading clients in banking, media, and e-commerce, mastering technologies like Spring Boot, AWS, Kubernetes, Docker, and GraphQL. I'm always eager to learn and apply best practices like test-driven development to craft maintainable, clean code. When I'm not coding, I love finding new ways to enhance user experiences and streamline backend systems.

Francisco III Castro

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





Hi, I'm Francisco III Castro, a Senior Java Backend Engineer with over 10 years of experience designing and implementing scalable and high-performance backend systems. I have a strong passion for leveraging microservices architecture, cloud-native solutions, and real-time data synchronization to deliver business-critical solutions that make a difference. I enjoy collaborating with cross-functional teams and mentoring junior developers to drive innovation and optimize system performance. Throughout my career, I have worked with industry-leading clients in banking, media, and e-commerce, mastering technologies like Spring Boot, AWS, Kubernetes, Docker, and GraphQL. I'm always eager to learn and apply best practices like test-driven development to craft maintainable, clean code. When I'm not coding, I love finding new ways to enhance user experiences and streamline backend systems.…Hi, I'm Francisco III Castro, a Senior Java Backend Engineer with over 10 years of experience designing and implementing scalable and high-performance backend systems. I have a strong passion for leveraging microservices architecture, cloud-native solutions, and real-time data synchronization to deliver business-critical solutions that make a difference. I enjoy collaborating with cross-functional teams and mentoring junior developers to drive innovation and optimize system performance. Throughout my career, I have worked with industry-leading clients in banking, media, and e-commerce, mastering technologies like Spring Boot, AWS, Kubernetes, Docker, and GraphQL. I'm always eager to learn and apply best practices like test-driven development to craft maintainable, clean code. When I'm not coding, I love finding new ways to enhance user experiences and streamline backend systems.

Available to hire

Hi, I’m Francisco III Castro, a Senior Java Backend Engineer with over 10 years of experience designing and implementing scalable and high-performance backend systems. I have a strong passion for leveraging microservices architecture, cloud-native solutions, and real-time data synchronization to deliver business-critical solutions that make a difference. I enjoy collaborating with cross-functional teams and mentoring junior developers to drive innovation and optimize system performance.

Throughout my career, I have worked with industry-leading clients in banking, media, and e-commerce, mastering technologies like Spring Boot, AWS, Kubernetes, Docker, and GraphQL. I’m always eager to learn and apply best practices like test-driven development to craft maintainable, clean code. When I’m not coding, I love finding new ways to enhance user experiences and streamline backend systems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Java Backend Engineer at SiriusXM

October 1, 2023 - Present

Designed and implemented backend services using Spring Boot, Apache Camel, and DynamoDB for seamless synchronization of recently played lists between Android and web platforms. Collaborated with cross-functional teams to integrate a dedicated Telemetry API ensuring 100% playlist migration accuracy. Developed keyboard search functionality to improve user navigation across devices. Integrated 360L Auth for secure login sessions in in-car radios. Optimized data streaming workflows with AWS Kinesis for real-time synchronization. Utilized KrakenD and Spring Cloud Gateway for efficient API routing. Streamed real-time telemetry data via Apache Kafka ensuring high availability. Deployed microservices using Docker, Kubernetes, AWS EC2, and Lambda, maintaining CI/CD workflows with GitHub Actions and JFrog Artifactory. Worked with the Telemetry API team on API requirements addressing playlist identity and catalog validation.

Senior Java Backend Engineer at SiriusXM

October 1, 2023 - Present

Designed and implemented backend services using Spring Boot, Apache Camel, and DynamoDB to enable seamless synchronization of recently played lists between Android and web platforms. Collaborated with cross-functional teams to integrate a dedicated Telemetry API, ensuring 100% playlist migration accuracy. Developed keyboard search functionality for plays across devices and integrated 360L Auth for robust authentication in in-car radios. Optimized data streaming workflows using AWS Kinesis for improved scalability and real-time sync across devices. Utilized KrakenD and Spring Cloud Gateway for efficient API redirection to support multiple platforms. Leveraged Apache Kafka to stream real-time telemetry data, ensuring high availability. Deployed microservices using Docker, Kubernetes, AWS EC2, and Lambda with CI/CD workflows via GitHub Actions and JFrog Artifactory. Collaborated with the Telemetry API team to define requirements addressing playlist identity and catalog validation issues.

Senior Java Backend Engineer at SiriusXM

October 1, 2023 - June 2, 2024

Designed and implemented backend services using Spring Boot, Apache Camel, and DynamoDB to enable seamless synchronization of recently played lists between Android and web platforms. Collaborated with cross-functional teams to integrate a dedicated Telemetry API, addressing data migration and ensuring playlist migration accuracy. Developed keyboard search functionality, integrated 360L Auth for secure sessions on in-car radios, and optimized data streaming with AWS Kinesis. Worked with KrakenD API Gateway and Spring Cloud Gateway for multi-platform API call redirection. Utilized Apache Kafka for real-time telemetry data streaming. Deployed microservices with Docker, Kubernetes, AWS EC2, and Lambda, supporting efficient CI/CD pipelines via GitHub Actions and JFrog Artifactory. Defined and integrated API requirements resolving playlist identity and catalog validation issues.

Senior Java Backend Engineer at One Brick Tech

September 30, 2023 - July 8, 2025

Led design, development, and deployment of scalable backend systems for major clients using Core Java and Spring Framework. Spearheaded microservices architecture ensuring modularity, maintainability, and improved scalability. Collaborated with frontend and DevOps teams for end-to-end solution delivery. Enhanced system performance with asynchronous processing and multi-threading. Designed RESTful APIs improving system interoperability with third-party services. Transitioned legacy applications to cloud infrastructures (AWS, Azure) increasing reliability and reducing costs. Implemented CI/CD pipelines using Jenkins and GitLab for faster delivery cycles. Integrated Apache Kafka for fault-tolerant messaging to enhance reliability. Conducted code reviews and mentored junior developers. Delivered projects on time with strong client communication. Optimized GraphQL APIs for better frontend data fetching. Applied TDD and integration testing methods.

Senior Java Backend Engineer at One Brick Tech

September 30, 2023 - July 8, 2025

Led design, development, and deployment of scalable backend systems for major clients using Core Java and Spring Framework, ensuring high performance and fault tolerance. Spearheaded microservices architecture to enhance modularity and scalability. Collaborated with front-end and DevOps teams for end-to-end solutions. Optimized backend via asynchronous processing and multi-threading for high throughput. Designed RESTful APIs for backend and third-party communication. Transitioned client applications from legacy to cloud infrastructures (AWS, Azure), improving reliability and reducing costs. Implemented CI/CD pipelines with Jenkins and GitLab. Integrated Apache Kafka for messaging between microservices enhancing system reliability. Conducted code reviews and mentored junior developers. Delivered projects on time with strong client satisfaction. Implemented and optimized GraphQL APIs to improve frontend performance and streamline data queries. Applied test-driven development and integrat

Senior Java Backend Engineer at One Brick Tech

August 1, 2020 - September 30, 2023

Led design, development, and deployment of scalable backend systems for major clients using Core Java and Spring Framework. Spearheaded microservices architecting to improve modularity, maintenance, and system scalability. Collaborated with front-end and DevOps teams delivering end-to-end solutions. Optimized backend systems with asynchronous processing and multi-threading for high throughput. Designed and integrated RESTful APIs to enhance interoperability. Transitioned applications from legacy systems to cloud infrastructures (AWS, Azure), improving reliability and cutting operational costs. Implemented CI/CD pipelines with Jenkins and GitLab, automating deployments. Integrated Apache Kafka for fault-tolerant messaging between microservices. Conducted code reviews and mentored junior developers. Developed and optimized GraphQL APIs to improve frontend performance, applying TDD practices with integration tests.

Full Stack Developer at Synechron

July 31, 2020 - July 8, 2025

Led design and development of scalable, microservices-based core banking system migrating legacy monolithic apps to cloud-native architecture for a Tier-1 global bank. Integrated AWS and Azure cloud platforms to optimize transaction processing and reduce operational costs by 30%. Implemented Apache Kafka for real-time data streaming and fraud detection enhancing security. Developed mobile-first applications improving user experience with instant payments and real-time alerts. Collaborated with teams on machine learning-based fraud detection reducing false positives by 50%. Built RESTful APIs integrating banking services with third-party payment gateways and legacy systems. Ensured compliance with GDPR, PCI-DSS, and AML through advanced security protocols including OAuth 2.0 and JWT. Managed CI/CD pipelines automating deployments with Jenkins, GitLab, and Terraform. Developed micro-frontends with Angular and React improving maintainability and team collaboration.

Full Stack Developer at Synechron

July 31, 2020 - July 8, 2025

Led design and development of scalable microservices-based core banking system, migrating legacy monolithic applications to cloud-native architecture for a Tier-1 global bank. Maintained, tuned, and repaired applications while providing user support. Integrated cloud platforms (AWS, Azure), optimizing transaction processing and improving system availability, reducing operational costs by 30%. Implemented Apache Kafka for real-time data streaming and fraud detection, enhancing security and transaction monitoring. Developed mobile-first banking applications with features like instant payments and real-time fraud alerts. Collaborated on real-time data streaming and machine learning fraud detection reducing false positives by 50%. Led implementation of RESTful APIs for integrating banking services with third-party payment gateways and legacy systems (SWIFT, ACH). Ensured regulatory compliance with GDPR, PCI-DSS, AML using OAuth 2.0, JWT, and encryption. Managed CI/CD pipelines with Jenkins

Full Stack Developer at Synechron

July 1, 2014 - July 31, 2020

Led design and development of a scalable microservices-based core banking system, migrating legacy monolithic applications to cloud-native architecture for a Tier-1 global bank. Integrated AWS and Azure cloud platforms, improving transaction processing and reducing costs by 30%. Implemented Apache Kafka for real-time data streaming and fraud detection. Developed mobile-first banking applications with features like instant payments and real-time fraud alerts. Collaborated on ML-based fraud detection reducing false positives by 50%. Implemented RESTful APIs for integration with payment gateways and legacy systems. Ensured regulatory compliance with GDPR, PCI-DSS, AML using OAuth 2.0, JWT, and encryption. Managed CI/CD pipelines with Jenkins, GitLab, and Terraform. Developed micro-frontends with Angular and React, enhancing modularity and maintainability.