hi, I'm rahul saini.

Built and maintained 5+ production-grade Spring Boot microservices for Project Planning, Document Management, WFM, and Invoice workflows, serving 5,000+ concurrent users with API Gateway and Eureka-based service discovery. Led Java 8 to Java 17 migration, Spring Boot 3.4.5 upgrades, and Maven-to-Gradle transition across services with zero downtime and backward compatibility. Implemented enterprise observability using ELK, Zipkin, and Prometheus; strengthened code quality with CheckStyle, Spotless, SonarQube, and pre-commit hooks; integrated Spring Cloud Config with vault-based secrets management and JWT security. Solved critical production bottlenecks including thread pool exhaustion and connection pooling inefficiencies, tuned HikariCP, optimized SQL (JOINs/stored procedures), and reduced logging overhead via AOP and JMeter-based load testing, delivering major throughput and reliability gains. Established multi-branch Git workflow (dev/sit/uat/prod) across large repo sets, improved deployment synchronization, supported Jenkins and multi-environment releases, and contributed R&D on Kafka, Spring Cloud Bus, and dynamic config refresh. Also delivered frontend impact with React.js by building and improving dashboard modules, fixing UI bugs, implementing accordion/column-reordering interactions, and integrating REST APIs for dynamic data-heavy views.

Independently designed and delivered the MVP Query Page using Next.js and Spring Boot, enabling users to submit natural-language queries against connected data sources and consume AI-generated insights through chart, table, and chat-style views. Implemented the complete RNP UI layer and integrated it with backend APIs for reliable end-to-end data flow. Built and maintained Spring Boot microservices for data retrieval, transformation, and response orchestration, following scalable architecture and clean coding practices. Collaborated with cross-functional teams to refine requirements, align technical design, and ship high-quality features on schedule.

Expanded a streamlined e-learning platform, Integrated LaTeX for mathematical symbols, streamlining the question creation workflow from 4 to 2 steps, improving efficiency while ensuring data integrity. Architected and implemented multi - tenant architecture allowing separate portals for institutes, teachers, and students, with automated credential management system for user onboarding Designed role - based access control(RBAC) system with org_admin privileges, enabling institutes to manage their teachers and learning content independently

Implemented an automatic route creation feature enabling users to upload .json files; this improvement generated corresponding pages and a navlinks in header, resulting in a 30% reduction in manual entry errors and saved 15 h/week. Migrated a client-side rendered website to static site generation (SSG), enhancing operational efficiency by 30% and significantly improving page load speeds for a better user experience.

Built and integrated a blog system, job management system, event management system, enquiry management system, emailing service, data export functionality to Excel directly from the frontend and SEO(metatags,sitemaps,robots.txt etc.) Enhanced application performance, achieving a 42% reduction in database calls through advanced caching strategies in Next.js and REST API optimizations.