Sai Madhuri Jannela
Sunnyvale,CA
Summary
Senior Software Engineer with extensive experience in developing and optimizing full-stack applications using Java, Kotlin, and Spring Boot. Demonstrated ability to enhance deployment automation and troubleshoot Kubernetes issues, contributing to high-performance, scalable software solutions in cloud-native environments.
Overview
10
10
years of professional experience
Work History
Senior Software Engineer
Walmart Inc.
09.2025 - Current
- Developed and enhanced backend services for Walmart's Returns Application Platform (RAP), supporting end-to-end return orchestration through Spring Boot, REST APIs, Apache Camel, and event-driven microservices.
- Automated return processing workflows in RAP-Orchestration and RAP-Gateway services, improving order validation, refund processing, inventory updates, and integrations with downstream services.
- Implemented CI/CD automation by integrating KITT post-deployment hooks with Concord workflows to automatically trigger P0 sanity and regression suites after Teflon deployments, improving deployment validation.
- Contributed to deployment automation by configuring Concord, Looper, and KITT pipelines to execute automated regression testing and deployment verification for cloud-native applications.
- Deployed and managed applications in AWS environments with DevOps teams, utilizing Docker, Kubernetes, Jenkins, and CI/CD pipelines to streamline software delivery.
- Debugged critical Kubernetes deployment issues, resolving CrashLoopBackOff, health probe failures, configuration loading, secret management, and application startup problems across Teflon and Vajra environments.
- Developed Python automation scripts to simplify deployment verification, automate health checks, and support troubleshooting of cloud-native applications running on Kubernetes.
- Participated in Java 21 migration activities, resolving build issues, dependency compatibility problems, and deployment configuration changes across RAP services.
- Monitored and analyzed application health using Splunk, Grafana, Kubernetes logs, and health endpoints to troubleshoot production-like issues and improve system reliability.
Server side Backend Engineer
Apple Inc.
06.2025 - 08.2025
- Developed backend services and RESTful APIs to power the Ocean Eligibility dashboard, which generates reports for Lines of Business (LOB) analyzing shipments via air vs sea.
- Designed and implemented complex SQL queries, optimizing database interactions for efficient retrieval of shipping and eligibility data.
- Conducted API testing using Postman and automated unit testing with JUnit and Mockito, ensuring high reliability of backend services.
- Collaborated with frontend teams to integrate APIs with React-based dashboard, enhancing data visualization and interactivity.
Server side Backend Engineer
Apple Inc.
Sunnyvale, California
08.2024 - 05.2025
- Developed robust RESTful APIs for secure eSIM provisioning and integration with carrier platforms as Backend Java Engineer on Apple’s esim Activation platform.
- Designed REST APIs integrating with carrier systems over HTTPS/SSL, ensuring secure data exchange and adherence to cryptographic standards.
- Created Kafka-based messaging workflows for real-time communication between internal services and external telecom providers, enhancing system reliability.
- Optimized Cassandra queries for storing eSIM metadata, improving performance and scalability to support millions of users.
- Upgraded Spring Boot from version 2.5 to 3.2, resolving dependency conflicts, updating Hibernate/JPA integrations, addressing deprecated APIs, and ensuring compatibility with Java 17.
- Used Insomnia to manually test APIs during development and integration phases.
- Wrote comprehensive JUnit and Mockito test cases, maintaining over 90% test coverage and ensuring production-grade reliability.
Senior Java Developer
Citibank
06.2019 - 07.2022
- Led the end-to-end development of applications using Java, Spring Boot, Hibernate, and designed features with Spring and Struts2.
- Directed upgrade of microservices from Java 11 to Java 17, addressing sonar vulnerabilities to enhance security.
- Managed AWS services (EC2, S3, Lambda, RDS) for efficient application deployment and infrastructure management.
- Utilized Jenkins for continuous integration and deployment, ensuring smooth project delivery.
- Used Spring Kafka API calls to process the messages smoothly on Kafka cluster setup with the help of Zookeeper.
- Created Restful APIs and integrated React components with backend services, consuming APIs in JavaScript.
- Developed JUnit test cases and maintained application standards in compliance with Section 508.
- Conducted code reviews, improving code quality and identifying potential issues through application of DRY principles.
Software Engineer
Tera Software Private Limited - India
12.2016 - 05.2019
- Designed and developed applications using the Spring Framework with MVC architecture.
- Applied Hibernate ORM to map MVC model data to MSSQL, enhancing SQL-based database interactions.
- Created dynamic web pages with jQuery plugins for drag-and-drop and auto-complete, utilizing JavaScript and Bootstrap.
- Applied debugging skills to improve code quality and application performance.
- Eliminated vulnerable JAR components to enhance application security and maintain integrity.
- Updated database fields, drop-down values, and reference data in reports tab to improve data accuracy and user experience.
- Used GIT for version control and maintained JIRA for managing epics, stories, and tasks.
- Tracked release progression to ensure alignment with planned delivery dates and facilitate timely project completion.
Education
Master of Science - Computer Science
University of Central Missouri
05-2024
Bachelor of Science - Computer Science
Holy Mary Institute of Technology & Sciences
06-2016
Skills
- Java
- Spring Boot
- Spring MVC
- RESTful API Design
- Microservices Architecture
- Cloud-Native Applications
- Apache Kafka
- SQL
- Docker
- JUnit
- Mockito
- TestNG
- JavaScript
- Reactjs
- HTML5
- CSS3
- OAuth 20
- JWT
- Web Security
- AWS
- Azure
- Google Cloud Platform
- Docker
- Kubernetes
- Jenkins
- Git
- Bitbucket
- Sourcetree
- Maven
- Insomnia
- Splunk
- Grafana
- HTTPS
- SSL/TLS
- Hibernate
- Spring Data JPA
- Apache Camel
- Apache Spark
- Oracle
- MySQL
- MongoDB
- Cassandra
- Cosmos DB
- CI/CD Automation
- Distributed Systems
- Event-Driven Architecture
- IntelliJ IDEA
- Jest
- TestNG
- CSS3
Timeline
Senior Software Engineer
Walmart Inc.
09.2025 - Current
Server side Backend Engineer
Apple Inc.
06.2025 - 08.2025
Server side Backend Engineer
Apple Inc.
08.2024 - 05.2025
Senior Java Developer
Citibank
06.2019 - 07.2022
Software Engineer
Tera Software Private Limited - India
12.2016 - 05.2019
Master of Science - Computer Science
University of Central Missouri
Bachelor of Science - Computer Science
Holy Mary Institute of Technology & Sciences