Rajesh Das

* Developed Spring Boot APIs for onboarding and transaction workflows.
* Built reusable scalable modules and improved performance via debugging and optimization.
* Collaborated across frontend and DevOps teams for reliability improvements.

• * Architected and developed the Insta‑Card platform with three backend components: **ia‑inventory‑services**, **ia‑agency‑services**, and **ia‑onboarding‑service (NestJS BFF)**; built **insta‑account‑bff** aggregating inventory and workbench APIs for frontend.
  * Designed MongoDB indexes (unique, compound, sparse, background) across inventory and agency services for cardkits, asset transfers, and audit logs, improving search/filter API performance.
  * Delivered scalable REST APIs using **Spring Boot 3 + Java 17** with pagination, dynamic filtering, structured error handling via **@ControllerAdvice**, and exception codes.
  * Built bulk processing/job orchestration engine for Excel uploads including job status APIs, S3 integration, and role‑segmented access (Workbench vs Insta APIs).
  * Implemented JWT security, RBAC enforcement, Kubernetes deployments, and Bitbucket CI/CD; added async processing, Retrofit clients, and geospatial indexing for location data.
  * Owned API design/documentation including REST contracts for assignments, transfers, metrics, and audit reporting.
• Implemented Kafka-driven async processing and caching for deduplication.
• Developed NestJS BFF aggregating backend microservices.
• Implemented markup engines and forex flows including quotes and orders.
• Implemented authentication, onboarding, and API standards.
• Migrated ledger capability from monolith to microservice.
• Implemented provider-based flows and pagination APIs.
• Enhanced software functionality by identifying and resolving complex technical issues.
• Mentored junior developers, fostering professional growth and enhancing team productivity.
• Developed scalable applications using agile methodologies for timely project delivery.
• Regularly reviewed peers'' code contributions, offering constructive feedback to enhance overall product quality.
• Collaborated with cross-functional teams to design innovative software solutions.
• Streamlined development workflows to increase team efficiency and reduce time spent on repetitive tasks.
• Delivered unit-tested systems within customer-prescribed timeframes.

* Developed business logic for XML/CSV transformations supporting tax processing.
* Implemented validations ensuring data accuracy and reliable processing.
* Delivered high‑quality releases in Agile timelines.