Senior Full Stack Engineer with Java/React Expertise

Abhay Sai Mamidi

LinkedIn — (***) *** – **** — ***********@*****.*** — Saint Louis, Mo

Summary

Full Stack Engineer with 4+ years of experience building scalable, high-performance applications across retail, e-commerce, and enterprise domains. Skilled in Java/Spring Boot, Node.js, React, TypeScript, Python, microservices architecture, SQL/NoSQL databases, and AWS cloud. Experienced in designing modern distributed systems, optimizing backend performance, developing responsive and intuitive UI components, and automating CI/CD pipelines using Jenkins, GitHub Actions, Docker, and Kubernetes.

Work Experience

Full Stack Engineer, Walmart Jan 2025 – Present

• Engineered and optimized customer-facing retail and e-commerce applications using Java, Spring Boot, Node.js, React, and TypeScript improving page responsiveness and user interactions by 35%.

• Designed and deployed scalable microservices on Kubernetes & Docker, reducing service latency by 40% and enabling high availability for 100M+ daily store transactions.

• Developed end-to-end features across checkout, cart, inventory, and order management systems, supporting large scale omnichannel retail operations and ensuring seamless user experiences across web and mobile platforms.

• Integrated distributed event systems using Kafka to process real-time store inventory updates, decreasing out-of-stock scenarios by 25%.

• Developed Python-based automation scripts and backend utilities to streamline data processing, improve operational workflows, and reduce manual effort across key retail platform services.

• Conducted integration, unit, and functional testing using JUnit, Mockito, Selenium, and Postman, increasing overall test coverage to 85% and improving application stability across multiple environments.

• Modernized legacy APIs into REST & GraphQL, improving system interoperability and reducing API error rates by 30%.

• Optimized SQL & NoSQL data models (PostgreSQL, MongoDB, DynamoDB), improving query throughput by 45% for large- scale retail datasets.

• Automated CI/CD pipelines using Jenkins, GitHub Actions, and ArgoCD, cutting release times from weekly to daily deployments.

Software Developer, TCS Aug 2019 – Jul 2023

• Built Java and Node.js backend services for enterprise clients in retail, banking, and logistics, improving backend performance by 30%.

• Developed responsive UI using React.js, Angular, HTML5, CSS3, and Redux, enhancing user engagement by 25% and improving performance through optimized component rendering and state management.

• Migrated monolithic systems to a microservices architecture, reducing deployment downtime by 50% while improving scalability, fault isolation, and independent service releases.

• Designed REST APIs, integrated third-party services, and optimized data processing flows, reducing API latency by 35% while improving overall system reliability and cross-service communication.

• Built CI/CD automation using Jenkins, Maven, and Docker, streamlining deployments and reducing manual effort by 40% while enabling faster, more consistent delivery across multiple environments.

• Improved data pipeline reliability using PostgreSQL, MySQL, and MongoDB; implemented caching and indexing strategies resulting in 55% faster queries.

• Implemented secure authentication using OAuth 2.0, JWT, and Spring Security, strengthening compliance and reducing vulnerabilities

• Collaborated in Agile teams, participated in daily standups, sprint reviews, and retrospectives, helping improve team velocity by 20%.

• Developed and optimized Spring Boot–based microservices with centralized exception handling, dependency injection, and asynchronous processing, improving backend throughput by 30% and enhancing overall service resilience.

Skills

Languages: Java, JavaScript (ES6+), TypeScript, Python, SQL Frontend Technologies: React.js, Redux, Angular, HTML5, CSS3, Bootstrap, Tailwind CSS Backend Technologies: Spring Boot, Node.js, Express.js, REST APIs, GraphQL, Microservices Architecture Databases: PostgreSQL, MySQL, MongoDB, DynamoDB, Oracle, NoSQL Cloud & DevOps: AWS (EC2, S3, Lambda, CloudFront), Docker, Kubernetes, GitHub Actions, Jenkins, ArgoCD CI/CD, Messaging & Streaming: Pipeline Automation, Containerized Deployments, Kafka, API Gateway Testing & Security: JUnit, Mockito, Selenium, Postman, OAuth 2.0, JWT, Spring Security Tools & Methodologies: Git, GitHub, Jira, Confluence, Agile/Scrum, TDD, New Relic, Splunk, Grafana Education

• Saint Louis University: Master of Science in Computer Science Aug 2023 – May 2025

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