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Maina Susan

@mainasusan

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Senior software engineer focused on compliant, high-performance digital payments.

United States

Message

What I'm looking for

I’m looking for roles where I can lead performance engineering and event-driven backend modernization for compliant payment systems, collaborating cross-functionally, improving observability, and building scalable, reliable services in containerized environments.

I’m a Senior Software Engineer with 8+ years delivering enterprise-grade solutions for digital payments, card network integration, and financial services technology. I specialize in Java, Oracle, PostgreSQL, and containerized environments including OpenShift and Kubernetes.

I lead performance engineering and modernization work for mission-critical payment systems—building performance testing and load testing frameworks, improving throughput, and reducing deployment times. I also instrument distributed services with instrumentation and service validation to enable proactive monitoring and faster incident response.

My core focus is event-driven microservices and compliance-first backend engineering, including PCI compliance, token removal, and data purging pipelines. I collaborate across large, matrixed teams to deliver scalable, secure, and high-performing backend services, from legacy migrations to ongoing observability and release readiness.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Amazon

Sep 2022 - Present (3 years 10 months)

Led enterprise performance testing and modernization for mission-critical payment services, improving transaction throughput by 30% and reducing deployment times by 40%. Delivered scalable backend payment processing with 99.99% uptime, strengthened observability and PCI-compliant data lifecycle (including token removal and PCI data purging), and reduced incident response times by 25%.

Senior Software Engineer

Improving

Jan 2019 - Sep 2022 (3 years 8 months)

Developed and optimized backend payment processing services using Java and Oracle, leading performance profiling and load testing to improve throughput and stability. Implemented event-driven architecture and PCI data purging/token removal processes to enhance data lifecycle management and reduce audit risks.

Java Oracle Jenkins Performance Testing Load Testing Profiling Event Driven Spring Boot PCI Data Purging Token Removal Data Purging Pipelines Microservices Application Modernization Instrumentation Tomcat PostgreSQL Git Maven

Senior Software Engineer

Credera

May 2018 - Jan 2019 (8 months)

Assisted in developing and maintaining backend services for financial applications using Java and Oracle under senior guidance. Supported performance/load testing, PCI compliance initiatives, and CI/deployment automation with Jenkins and Maven while contributing to troubleshooting and code reviews.