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Hello, I’m Karthika Mullangi, a Senior Full Stack Java Developer with 11+ years of hands-on experience building cloud-native, enterprise systems across healthcare, financial services, and retail. I specialize in Java 8–21, Spring Boot microservices, and event-driven architectures, with a strong focus on scalable, reliable solutions that perform under real production workloads. I also create modern frontends with React and Angular, driving UI modernization and robust state management. I enjoy shaping practical architectures that improve resilience, performance, and operability, and I regularly apply best practices for API design, security, observability, and DevOps. I’ve delivered complex workflows—from claims and eligibility to trading, settlement, and promotions—by translating business requirements into maintainable distributed systems on AWS and Azure, with strong emphasis on testing, CI/CD, and production-grade monitoring.…Hello, I’m Karthika Mullangi, a Senior Full Stack Java Developer with 11+ years of hands-on experience building cloud-native, enterprise systems across healthcare, financial services, and retail. I specialize in Java 8–21, Spring Boot microservices, and event-driven architectures, with a strong focus on scalable, reliable solutions that perform under real production workloads. I also create modern frontends with React and Angular, driving UI modernization and robust state management. I enjoy shaping practical architectures that improve resilience, performance, and operability, and I regularly apply best practices for API design, security, observability, and DevOps. I’ve delivered complex workflows—from claims and eligibility to trading, settlement, and promotions—by translating business requirements into maintainable distributed systems on AWS and Azure, with strong emphasis on testing, CI/CD, and production-grade monitoring.

Karthika Mullangi

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

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Hello, I’m Karthika Mullangi, a Senior Full Stack Java Developer with 11+ years of hands-on experience building cloud-native, enterprise systems across healthcare, financial services, and retail. I specialize in Java 8–21, Spring Boot microservices, and event-driven architectures, with a strong focus on scalable, reliable solutions that perform under real production workloads. I also create modern frontends with React and Angular, driving UI modernization and robust state management. I enjoy shaping practical architectures that improve resilience, performance, and operability, and I regularly apply best practices for API design, security, observability, and DevOps. I’ve delivered complex workflows—from claims and eligibility to trading, settlement, and promotions—by translating business requirements into maintainable distributed systems on AWS and Azure, with strong emphasis on testing, CI/CD, and production-grade monitoring.…Hello, I’m Karthika Mullangi, a Senior Full Stack Java Developer with 11+ years of hands-on experience building cloud-native, enterprise systems across healthcare, financial services, and retail. I specialize in Java 8–21, Spring Boot microservices, and event-driven architectures, with a strong focus on scalable, reliable solutions that perform under real production workloads. I also create modern frontends with React and Angular, driving UI modernization and robust state management. I enjoy shaping practical architectures that improve resilience, performance, and operability, and I regularly apply best practices for API design, security, observability, and DevOps. I’ve delivered complex workflows—from claims and eligibility to trading, settlement, and promotions—by translating business requirements into maintainable distributed systems on AWS and Azure, with strong emphasis on testing, CI/CD, and production-grade monitoring.

Available to hire

Hello, I’m Karthika Mullangi, a Senior Full Stack Java Developer with 11+ years of hands-on experience building cloud-native, enterprise systems across healthcare, financial services, and retail. I specialize in Java 8–21, Spring Boot microservices, and event-driven architectures, with a strong focus on scalable, reliable solutions that perform under real production workloads. I also create modern frontends with React and Angular, driving UI modernization and robust state management.

I enjoy shaping practical architectures that improve resilience, performance, and operability, and I regularly apply best practices for API design, security, observability, and DevOps. I’ve delivered complex workflows—from claims and eligibility to trading, settlement, and promotions—by translating business requirements into maintainable distributed systems on AWS and Azure, with strong emphasis on testing, CI/CD, and production-grade monitoring.

Skills

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Work Experience

Sr. Full Stack Java Developer at Vanguard

January 1, 2025 - Present

Designed and developed Java 21, Spring Boot 3.x microservices for trade lifecycle workflows (order capture, validation, execution, allocation, settlement) within an investment platform. Built and enhanced Order Management System APIs for trade placement, amendments, and cancellations with idempotent processing and high-volume transaction handling. Implemented Apache Kafka–based event-driven architecture with topic partitioning, consumer groups, and retries to process trade events across distributed microservices, sustaining 2K–4K TPS with low latency. Implemented T+1 settlement workflows and reconciliation with data validation and error handling. Standardized RESTful APIs with versioning, clear contracts, and structured errors to improve integration reliability. Optimized queries, payloads, and caching to sustain consistent response times under peak load. Applied Resilience4j circuit breakers, retries, and timeouts to prevent cascading failures. Investigated production issues (Kafk

Sr. Full Stack Java Developer at Cigna

November 1, 2020 - December 1, 2024

Developed Java 11/17 Spring Boot microservices for claims processing, member eligibility, and healthcare workflows in a high-volume distributed environment. Designed RESTful APIs for claims, eligibility, and member data with secure, scalable backend systems. Integrated Apache Kafka–based event-driven architecture to handle claims updates and member notifications, improving decoupling and fault isolation. Supported 1K–2K TPS during peak processing cycles. Optimized API performance with query tuning, Redis/Ehcache caching, and efficient data access to achieve sub-200ms responses. Used Python/PySpark for batch processing across large healthcare datasets. Ensured PHI/PII security and HIPAA-compliant workflows. Implemented Spring Security, OAuth2, JWT, and RBAC. Built frontend applications using Angular (8–13) and React (17). Integrated front and back ends with consistent API contracts. Contributed to cloud deployments on AWS and Azure with Docker and Kubernetes (EKS/AKS). Used Terraf

Full Stack Java Developer at MedImpact Healthcare Systems

October 1, 2019 - October 1, 2020

Designed and developed Spring Boot microservices for pharmacy claims processing, member eligibility, and enterprise healthcare integrations, enabling reliable transaction handling across regulated healthcare platforms. Modernized legacy Java applications into Spring Boot 2.2 services deployed on AWS EC2. Implemented services supporting high-volume pharmacy claims and eligibility transactions (1–2M+ daily). Optimized Spring Batch workflows and Oracle PL/SQL routines, reducing batch execution time by 20–25% and accelerating large-scale data ingestion. Worked with large Oracle datasets, optimizing queries and indexes. Built and secured RESTful APIs using Spring Security, OAuth2, and CA SiteMinder SSO. Developed and maintained Angular 7/8 applications and contributed React components. Aligned frontend and backend integrations, enforcing consistent API contracts. Used Docker-based containerization and deployed on AWS. Implemented JMS-based asynchronous processing. Automated CI/CD pipeli

Full Stack Developer at DoorDash

July 1, 2018 - September 1, 2019

Designed and delivered full-stack marketplace features using Node.js, Express.js, React 16, and Redux, supporting order placement, fulfillment tracking, merchant onboarding, and real-time delivery updates across high-traffic regions. Developed RESTful APIs in Node.js/Express; implemented JWT-based authentication and RBAC. Engineered event-driven processing pipelines using Apache Kafka to handle 3–5M+ events daily. Maintained low-latency APIs for order placement and real-time tracking. Built customer-facing and internal web apps with React 16, Redux, and React Router. Integrated MongoDB and Elasticsearch for scalable data storage and fast search. Containerized services with Docker and deployed on AWS EC2; used ALB, S3, IAM, VPC. Automated CI/CD with Jenkins and early Kubernetes (EKS) adoption; monitored with Prometheus, Grafana, and Splunk.

Java/J2EE Developer at Hexagon

September 1, 2016 - July 1, 2017

Developed service-oriented backend components using Java 8 and Spring Boot 1.4/1.5 to support Asset Lifecycle Management applications for asset tracking and maintenance workflows. Supported hundreds of thousands of transactions daily. Enhanced API/UI performance through Hibernate tuning and Angular 2 improvements. Refactored JSP/Servlets to Spring MVC; implemented Hibernate ORM with Oracle 11g. Designed RESTful APIs and built responsive UI components with Angular 2. Implemented JMS/ActiveMQ for asynchronous processing. Automated builds with Maven/Jenkins; deployed on Tomcat/JBoss. Collaborated in Agile Scrum and mentored juniors.

Java/J2EE Developer at Wipro

June 1, 2014 - August 1, 2016

Developed Java/J2EE backend applications for telecom OSS/BSS systems, supporting service provisioning, order management, and operational workflows across large subscriber bases. Processed millions of subscriber transactions, improving throughput. Refactored legacy components and implemented JMS-based asynchronous processing with ActiveMQ. Built enterprise web modules using Struts 2.5, JSP, and Servlets; designed REST and SOAP services. Optimized Hibernate queries with Oracle 10g. Automated builds with Maven/Jenkins; deployed on Tomcat/JBoss. Collaborated in Agile Scrum, contributing to production deployments and secure coding practices.