Shashank Tiwari

Software Engineer

Tata Consultancy Services (TCS)

Dec 2023 - Present

Designed and developed robust backend applications using Spring Boot, ensuring a clean and maintainable architecture; built and exposed RESTful APIs to enable seamless communication between systems. Engineered an API handling 100K+ queries/minute with custom batch processing for data generation, reducing database load by 68%. Improved P95 latency by 70% (200ms → 60ms) using CompletableFuture and parallel stream processing. Managed ~500 DB operations/second (~3 lakh per 10 minutes) through asynchronous processing and thread pool tuning. Implemented secure authentication and authorization using Spring Security and OAuth2 to support secure access to reporting applications. Developed and maintained CI/CD pipelines using Git and GitLab, streamlining automated deployments. Containerized applications with Docker and facilitated automated deployments on AWS through CI/CD pipelines. Established backend unit and integration testing standards using JUnit 5 and Mockito, achieving 85%+ coverage across core service modules. Implement micro-frontend architecture using Module Federation to modularize the application, enabling independent development, deployment, and scaling of features across teams, with lazy loading of feature modules to improve initial load performance. Reduced dashboard load time from 4.2s to 1.8s by optimizing component lifecycle, routing strategy, and bundle splitting. Built a centralized caching and state orchestration layer using RxJS Subject, cutting redundant API calls by 65%. Build dynamic, validation-driven forms with Angular Reactive Forms and manage seamless in-app navigation through Angular Router. Integrate RESTful APIs into responsive Angular applications, ensuring cross-browser compatibility and consistent performance across devices. Established unit testing standards, achieving 85%+ coverage across core modules.