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I am a versatile Senior Java Full Stack Developer with over 11 years of experience building enterprise-scale applications across sectors like finance, healthcare, insurance, and government. I specialize in designing backend-intensive, cloud-native platforms and have a deep passion for scalable microservices, reactive programming, and mentoring teams to deliver reliable, maintainable software. Throughout my career, I've led architectural transitions, driven end-to-end delivery under demanding SLAs, and contributed across the stack from databases to frontend accessibility. I'm committed to writing clean, testable code and enabling continuous improvement through DevSecOps pipelines, observability, and knowledge sharing.…I am a versatile Senior Java Full Stack Developer with over 11 years of experience building enterprise-scale applications across sectors like finance, healthcare, insurance, and government. I specialize in designing backend-intensive, cloud-native platforms and have a deep passion for scalable microservices, reactive programming, and mentoring teams to deliver reliable, maintainable software. Throughout my career, I've led architectural transitions, driven end-to-end delivery under demanding SLAs, and contributed across the stack from databases to frontend accessibility. I'm committed to writing clean, testable code and enabling continuous improvement through DevSecOps pipelines, observability, and knowledge sharing.

Rehaman Mohammad

Full Stack Developer, Developer, Back-End Developer, +3

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I am a versatile Senior Java Full Stack Developer with over 11 years of experience building enterprise-scale applications across sectors like finance, healthcare, insurance, and government. I specialize in designing backend-intensive, cloud-native platforms and have a deep passion for scalable microservices, reactive programming, and mentoring teams to deliver reliable, maintainable software. Throughout my career, I've led architectural transitions, driven end-to-end delivery under demanding SLAs, and contributed across the stack from databases to frontend accessibility. I'm committed to writing clean, testable code and enabling continuous improvement through DevSecOps pipelines, observability, and knowledge sharing.…I am a versatile Senior Java Full Stack Developer with over 11 years of experience building enterprise-scale applications across sectors like finance, healthcare, insurance, and government. I specialize in designing backend-intensive, cloud-native platforms and have a deep passion for scalable microservices, reactive programming, and mentoring teams to deliver reliable, maintainable software. Throughout my career, I've led architectural transitions, driven end-to-end delivery under demanding SLAs, and contributed across the stack from databases to frontend accessibility. I'm committed to writing clean, testable code and enabling continuous improvement through DevSecOps pipelines, observability, and knowledge sharing.

Available to hire

I am a versatile Senior Java Full Stack Developer with over 11 years of experience building enterprise-scale applications across sectors like finance, healthcare, insurance, and government. I specialize in designing backend-intensive, cloud-native platforms and have a deep passion for scalable microservices, reactive programming, and mentoring teams to deliver reliable, maintainable software.

Throughout my career, I’ve led architectural transitions, driven end-to-end delivery under demanding SLAs, and contributed across the stack from databases to frontend accessibility. I’m committed to writing clean, testable code and enabling continuous improvement through DevSecOps pipelines, observability, and knowledge sharing.

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Expert

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Intermediate

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Work Experience

Sr. Java Full Stack Developer at American Express

February 1, 2024 - Present

Architected and developed high-concurrency, fault-tolerant microservices using Java 21, Spring Boot, and WebFlux with reactive principles. Led real-time streaming architectures using Apache Kafka, Kafka Streams, and ksqlDB for fraud detection. Built scalable frontends with ReactJS and TypeScript, ensuring WCAG accessibility compliance. Secured APIs with OAuth 2.0 and JWT, spearheaded CI/CD automation reducing lead time by 40%. Delivered multi-region Kubernetes and OpenShift deployments with zero downtime and enhanced observability using Prometheus, Grafana, and ELK Stack. Mentored engineers and designed failover strategies, modernized batch jobs to event-driven services, and drove cloud cost optimization reducing AWS spend by 20%.

Java Full Stack Developer at Centene

January 31, 2024 - July 10, 2025

Designed fault-tolerant microservices using Java 17, Kotlin, and Spring Boot for healthcare compliance workflows. Led migration from monoliths to event-driven microservices using Apache Kafka and ActiveMQ. Engineered performant data tiers with PostgreSQL, MongoDB, and Redis. Developed accessible ReactJS frontends with WCAG compliance. Secured HIPAA compliant APIs using OAuth 2.0 and JWT. Automated CI/CD pipelines with Jenkins and GitHub Actions achieving daily production releases. Implemented observability and anomaly detection with Prometheus, Grafana, and ELK Stack, reducing mean time to resolution by 30%. Mentored teams on DevSecOps and microservices architecture.

Java Full Stack Developer at Workday

June 30, 2022 - July 10, 2025

Developed scalable microservices with Java 8/11, Kotlin, Spring Boot and MVC applying Domain-Driven Design. Built event-driven workflows with Apache Kafka and ActiveMQ including ML-enhanced streaming for risk detection. Tuned Oracle DB and integrated MongoDB and Redis. Created ReactJS and TypeScript frontend components following WCAG 2.1 standards. Automated testing with JUnit, Mockito, Cucumber, Selenium, Jasmine, and Karma. Secured services with OAuth 2.0, JWT, and RBAC. Automated CI/CD pipelines with Maven, Jenkins, and GitHub Actions. Containerized services with Docker and Kubernetes. Reduced AWS costs by 15% via resource optimization. Delivered proactive observability and mentoring.

Java Developer at State Of Nebraska

October 31, 2020 - July 10, 2025

Led development of reusable Spring Boot microservices in Medicaid systems. Architected Kafka event workflows and integrated Amazon SQS for hybrid ecosystems. Used PostgreSQL and MongoDB for transactional and metadata storage. Implemented HashiCorp Vault for secrets management. Delivered accessible ReactJS UIs with Redux following ARIA standards. Secured APIs via OAuth 2.0, JWT, and RBAC. Developed tests with JUnit 5, Mockito, and Postman. Automated frontend testing, defined RESTful APIs via OpenAPI 3.0 specs. Managed container orchestration using Docker and Kubernetes with Helm. Created CI/CD pipelines enforcing security and quality gates. Monitored cloud infrastructure and collaborated with Agile teams.

Java Developer at PepsiCo

January 31, 2018 - July 10, 2025

Developed distributed microservices with Java 7 & 8, Spring Boot/MVC delivering RESTful endpoints for financial operations. Built RabbitMQ pipelines for async event orchestration. Enabled Prometheus and Grafana monitoring improving incident response. Optimized MySQL data layers using Flyway. Authored JUnit 5, Mockito, Jasmine, and Karma tests ensuring regression coverage. Containerized microservices deployed in Azure environments. Automated CI/CD with Jenkins and Maven. Delivered AngularJS 1.x frontends with responsive and accessible UI. Secured APIs with token-based auth and centralized logging with SLF4J. Reduced deployment time by 30%.

Jr.Java Developer at Cox Communication

December 31, 2015 - July 10, 2025

Engineered backend modules with Core Java 7 and Spring MVC applying SOLID principles. Developed REST and SOAP APIs using JAX-WS and Apache tools. Implemented Hibernate ORM with Oracle PL/SQL optimizations. Built RabbitMQ event pipelines and integrated Ehcache caching improving performance. Created responsive AngularJS 1.x frontends aligned to WCAG 2.0. Authored unit and integration tests with JUnit 4, Mockito, and PowerMock. Secured APIs following OWASP guidelines. Managed builds via Maven, Jenkins, and Nexus. Version controlled code with SVN and GitLab CE. Deployed on JBoss AS 7.x with JVM tuning for stability. Enhanced observability using Log4j and contributed to static code analysis. Supported early Azure cloud adoption activities.

Sr. Java Full Stack Developer at American Express

February 1, 2024 - Present

Architected and developed scalable, fault-tolerant microservices using modern Java versions (17 and 21), Spring Boot, and reactive frameworks to support a global real-time payments modernization platform. Designed real-time streaming fraud detection pipelines using Apache Kafka, Kafka Streams, and ksqlDB. Built performant UIs with ReactJS and TypeScript focusing on accessibility and performance. Secured APIs with OAuth 2.0 and JWT, embedded PCI-DSS compliance, and enhanced observability using OpenTelemetry and Prometheus. Led containerization and orchestration with Docker, Kubernetes, and OpenShift, enabling zero-downtime deployments. Automated CI/CD workflows reducing lead times by 40%. Mentored junior engineers and contributed to architectural decisions ensuring system reliability, security, and cost efficiency in a high-volume financial domain environment.

Java Full Stack Developer at Centene

January 31, 2024 - July 10, 2025

Led scalable microservice design and implementation for healthcare modernization initiatives, applying DDD and SOLID principles. Migrated legacy monoliths to event-driven architectures combining Apache Kafka and ActiveMQ, improving latency and resilience. Developed accessible frontends with ReactJS and Redux achieving WCAG compliance. Secured APIs following HIPAA regulations using OAuth 2.0, JWT, and RBAC. Automated full test coverage and CI/CD pipelines, integrating security policy gates and static scans. Enhanced cloud infrastructure with Terraform and AWS CloudFormation across multi-region environments. Collaborated within Agile teams to deliver regulatory-compliant features. Mentored engineers and optimized Kafka health claim streaming and ML-based fraud detection pipelines, reducing operational overhead and improving fraud precision.

Java Full Stack Developer at Workday

June 30, 2022 - July 10, 2025

Designed and developed resilient microservices using Java 8/11 and Kotlin with Spring Boot and Spring MVC, focused on scalable enterprise systems refactoring. Applied event-driven architectures with Apache Kafka and ActiveMQ to improve fault tolerance. Integrated MongoDB and Redis for metadata and session management. Developed accessible ReactJS frontends with lazy loading and ARIA roles to meet WCAG 2.1 standards. Automated testing and CI/CD pipelines with Jenkins, Maven, and GitHub Actions including SonarQube and security scans. Led AWS infrastructure provisioning using Terraform and CloudFormation, reducing costs and improving scalability. Enhanced observability with OpenTelemetry, Grafana, and ELK Stack, decreasing mean time to detection. Mentored junior developers and facilitated API versioning and secure coding best practices within Agile workflows.

Java Developer at State Of Nebraska

October 31, 2020 - July 10, 2025

Led development of Spring Boot microservices for Medicaid eligibility systems, applying DDD and SOLID principles to modularize services. Architected event workflows integrating Apache Kafka and Amazon SQS ensuring transactional consistency. Modeled business entities using PostgreSQL and MongoDB for structured and unstructured data storage. Implemented centralized secrets management via HashiCorp Vault. Built compliant ReactJS UIs with Redux and ARIA roles supporting accessibility standards. Secured API layers with OAuth 2.0, JWT, and RBAC. Automated testing with JUnit, Mockito, and Postman, and front-end testing with Jasmine and Karma. Orchestrated containerized deployments with Docker, Kubernetes, and Helm. Designed CI/CD pipelines to enforce quality and security gates. Collaborated with cross-functional Agile teams driving sprint execution and documentation management.

Java Developer at PepsiCo

January 31, 2018 - July 10, 2025

Developed distributed microservices using Java 7/8 and Spring Boot supporting financial transactions and vendor integration workflows. Built async event pipelines with RabbitMQ and monitored health via Prometheus and Grafana. Optimized MySQL data layers and maintained schemas with Flyway. Authored extensive unit and UI tests increasing coverage and reducing regressions. Containerized applications with Docker and deployed on Azure App Services. Automated CI/CD pipelines using Jenkins and Maven integrating SonarQube and Nexus artifact repository. Developed AngularJS 1.x frontends for admin dashboards implementing responsive design and ARIA standards. Embedded token-based authentication and centralized logging facilitating traceability and debugging. Reduced deployment time and actively participated in Agile processes with JIRA.

Jr.Java Developer at Cox Communication

December 31, 2015 - July 10, 2025

Developed backend modules in Core Java 7 and Spring MVC applying SOLID and layered architecture principles. Built REST and SOAP APIs facilitating seamless integration between legacy and modern systems. Implemented Hibernate ORM and optimized JDBC and PL/SQL calls for Oracle databases. Created RabbitMQ pipelines improving event-driven workflow throughput. Integrated Ehcache to boost dashboard responsiveness. Developed accessible AngularJS 1.x frontends compatible with WCAG 2.0 standards. Authored unit and integration tests using JUnit, Mockito, and PowerMock. Secured APIs following OWASP best practices and documented interfaces with Swagger. Managed CI pipelines with Maven and Jenkins. Deployed applications on JBoss AS and optimized JVM configurations. Participated in early cloud adoption with Azure collaboration.

Sr. Java Full Stack Developer at American Express

February 1, 2024 - Present

Architected and developed high-concurrency, fault-tolerant microservices leveraging Java 21, Spring Boot, and reactive programming to modernize real-time payments platform. Built scalable streaming pipelines with Kafka for fraud detection and operational telemetry. Applied polyglot persistence with PostgreSQL, MongoDB, and DynamoDB. Led frontend development using ReactJS and TypeScript with WCAG-compliant accessible dashboards. Secured APIs with OAuth 2.0 and JWT integrating PCI-DSS controls. Implemented robust test automation and CI/CD reducing lead time by 40%. Automated infrastructure provisioning with Terraform and CloudFormation. Delivered observability and monitoring with Prometheus, Grafana, and OpenTelemetry. Mentored junior engineers and drove architectural decisions, achieving cost optimization and availability improvements across multi-region deployments.

Java Full Stack Developer at Centene

January 31, 2024 - July 10, 2025

Designed scalable microservices using Java 17, Kotlin, and Spring Boot for healthcare modernization projects adhering to HIPAA compliance. Migrated legacy monoliths into event-driven architectures integrating Kafka and ActiveMQ. Engineered data persistence strategies using PostgreSQL, MongoDB, and Redis with high throughput and low latency. Developed accessible ReactJS frontend applications with Redux and ARIA standards. Led end-to-end test automation and containerized deployment pipelines using Kubernetes and Docker with 99.98% uptime. Provided continuous integration with Jenkins and GitHub Actions integrating DevSecOps security measures. Implemented real-time fraud detection with ML-enhanced stream scoring and optimized infrastructure costs by 18%. Collaborated cross-functionally across Agile teams and contributed to architecture governance.

Java Full Stack Developer at Workday

June 30, 2022 - July 10, 2025

Developed modular microservices with Java 8/11, Kotlin, and Spring Boot applying DDD and clean architecture principles for enterprise cloud applications. Built event-driven workflows with Apache Kafka and ActiveMQ, enabling fault tolerance and asynchronous processing. Enhanced frontend user experiences with ReactJS, TypeScript, and WCAG 2.1 compliant designs. Automated testing with JUnit, Selenium, Cucumber, Jasmine, and Karma. Secured APIs using OAuth 2.0, JWT, and RBAC for HIPAA-aligned environments. Streamlined CI/CD pipelines using Jenkins, Maven, and GitHub Actions with integrated policy gates and security scans. Optimized AWS infrastructure provisioning and cost savings by 15%. Developed observability systems with OpenTelemetry and ELK Stack, improving incident detection and resolution. Mentored junior engineers and led API versioning strategy.

Java Developer at State Of Nebraska

October 31, 2020 - July 10, 2025

Led development of reusable Spring Boot microservices supporting Medicaid eligibility systems. Architected Kafka event workflows and integrated Amazon SQS for reliable messaging. Modeled business data with PostgreSQL and MongoDB supporting multi-source workflows. Employed HashiCorp Vault for secure secret management. Designed accessible ReactJS frontend portals with OAuth-secured APIs. Automated testing with JUnit and Mockito. Implemented CI/CD pipelines with Maven, Jenkins, and GitHub Actions incorporating security scans. Monitored systems with AWS CloudWatch and custom dashboards improving uptime. Collaborated in Agile teams to drive sprint delivery and wrote comprehensive documentation easing onboarding and operational continuity.

Java Developer at PepsiCo

January 31, 2018 - July 10, 2025

Designed and developed distributed microservices using Java 7 & 8 and Spring Boot for financial operations automation. Built asynchronous RabbitMQ messaging pipelines and monitored them with Prometheus and Grafana improving event throughput. Optimized data layers with MySQL and Flyway schema versioning. Developed full-stack tests reducing regression defects by 40%. Automated CI/CD workflows using Jenkins and Maven with SonarQube gates. Created AngularJS 1.x interactive admin UIs compliant with WCAG. Secured API layers and managed builds and deployments on Azure App Services ensuring consistent delivery. Participated actively in Agile ceremonies enhancing collaboration and project visibility.

Jr.Java Developer at Cox Communications

December 31, 2015 - July 10, 2025

Developed backend modules in Java 7 and Spring MVC for financial workflow orchestration. Created REST and SOAP APIs enabling legacy system interoperability. Implemented Hibernate ORM with optimized Oracle PL/SQL for audit workflows. Built RabbitMQ pipelines to decouple services and integrate Ehcache for caching improving dashboard response. Developed AngularJS 1.x frontends compliant with WCAG 2.0. Authored unit and integration tests driving test-driven development. Secured API layers following OWASP principles. Managed builds with Maven and Jenkins including code versioning with SVN and GitLab. Deployed applications on JBoss AS and enhanced backend observability with Log4j. Supported early Azure infrastructure setups.

Sr. Java Full Stack Developer at American Express

February 1, 2024 - Present

Architected and developed high-concurrency, fault-tolerant microservices using Java 21, Java 17, Spring Boot, and Spring WebFlux. Designed real-time streaming architectures with Apache Kafka to power fraud detection workflows. Built scalable polyglot persistence with PostgreSQL, MongoDB, and DynamoDB. Developed accessible ReactJS and TypeScript UI components with WCAG compliance. Secured APIs using OAuth 2.0 and JWT. Led test automation with JUnit 5, Mockito, Cucumber, and Testcontainers. Containerized services with Docker, Kubernetes, and OpenShift for zero-downtime rollouts. Automated CI/CD pipelines and enforced security policies with SonarQube, Trivy, and Aqua. Enabled observability with OpenTelemetry, Prometheus, and Grafana. Mentored junior engineers and contributed to platform architecture, modernization, and cloud cost optimization.

Java Full Stack Developer at Centene

January 31, 2024 - July 10, 2025

Designed scalable microservices using Java 17, Kotlin, and Spring Boot, leading migration from monoliths to event-driven microservices. Implemented hybrid messaging with Kafka and ActiveMQ, optimized databases with PostgreSQL and MongoDB, and built accessible ReactJS frontends with WCAG compliance. Secured APIs with OAuth 2.0 and JWT, reduced defects through comprehensive testing, containerized microservices, and automated CI/CD pipelines. Provisioned multi-region infrastructure with Terraform and AWS CloudFormation. Led observability initiatives with Prometheus and ELK Stack to improve incident response. Mentored teams and drove architecture reviews, embedded ML for fraud detection, and ensured HIPAA compliance.

Java Full Stack Developer at Workday

June 30, 2022 - July 10, 2025

Developed scalable microservices using Java 8/11, Spring Boot, and Kotlin, applying DDD and clean architecture. Built event-driven workflows with Kafka and ActiveMQ, enhanced risk detection with ML-powered Kafka streams, and optimized Oracle databases. Developed ReactJS and TypeScript frontends with accessibility compliance. Secured APIs using OAuth 2.0 and JWT. Automated testing and CI/CD with Jenkins and GitHub Actions, containerized services with Docker and Kubernetes. Managed AWS infrastructure provisioning, cost optimization, and observability using OpenTelemetry and ELK Stack. Mentored junior developers and led API versioning, security, and performance tuning.

Java Developer at State Of Nebraska

October 31, 2020 - July 10, 2025

Led development of reusable Spring Boot microservices using Java 8 & 11. Architected Kafka and Amazon SQS event workflows ensuring transactional integrity. Modeled business entities using PostgreSQL and MongoDB. Integrated HashiCorp Vault for secrets management. Built accessible ReactJS UIs with WCAG compliance and secured APIs with OAuth 2.0, JWT, and RBAC. Developed comprehensive tests and automated CI/CD pipelines with Maven, Jenkins, and GitHub Actions. Monitored infrastructure using AWS CloudWatch, collaborated with Agile teams, and created documentation to support platform maintenance and continuity.

Java Developer at PepsiCo

January 31, 2018 - July 10, 2025

Designed and developed distributed microservices using Java 7 & 8. Built RabbitMQ pipelines for async event orchestration. Enabled observability with Prometheus and Grafana. Optimized MySQL data access layers. Authored backend and frontend tests and packaged microservices into Docker containers deployed on Azure. Automated CI/CD with Jenkins and Maven, exposed secure RESTful APIs using Swagger, and developed AngularJS 1.x UIs with accessibility and responsive design. Improved deployment speed, security, and participated actively in Agile ceremonies.

Jr.Java Developer at Cox Communication

December 31, 2015 - July 10, 2025

Engineered backend modules with Core Java 7 and Spring MVC using SOLID principles. Developed REST and SOAP APIs with JAX-WS, Apache Axis, and Apache CXF. Implemented Hibernate ORM and optimized PL/SQL for Oracle databases. Built RabbitMQ pipelines and integrated Ehcache for caching. Created AngularJS 1.x front-end admin panels with WCAG 2.0 compliance. Authored unit and integration tests using JUnit 4 and Mockito. Secured APIs following OWASP standards and managed builds with Maven and Jenkins. Supported Azure infrastructure setup during early cloud adoption.