Shubham Prakash

Java Developer with extensive experience in application development and maintenance using Java and J2EE technologies. Skilled in designing and implementing RESTful APIs and proficient in microservices architecture, containerization, and orchestration. Strong expertise in OOP principles, version control with Git, and build management with Maven. Proven ability to thrive in Agile environments, leveraging Scrum methodologies for effective team collaboration.

Overview: Key Contributions:  Microservices integration and architecture, User registration and wallet management, Card lifecycle and NFC tap system, OEM management via admin portal  Reporting and analytics Project 2: Wearable payments  – Client: Infineon (secure element integration) Overview: Key contributions: Project 3: Digital wallet HCE for microfinance bank Overview: Key contributions:

Project 1: Digital Wallet HCE Solution – Client: Reliance

Role: Backend Developer
Technologies: Java, Spring Boot, Microservices, REST APIs, NFC, VTS, MDES, Kafka, MySQL, Jenkins, Git, JUnit

Developed a full-fledged digital wallet application supporting secure NFC-based tap transactions, peer-to-peer payments, and integration with various financial platforms. The project heavily utilized Host Card Emulation (HCE) and focused on OEM onboarding, wallet management, and card lifecycle services.

• Worked across multiple services: Wallet Service, Wallet Web, User Service, MDES, VTS, Notification Service, and simulators.
• Enabled efficient service-to-service communication, ensuring reliability and scalability.
• Implemented user onboarding workflow with OTP verification.
• Created logic to generate wallets post-registration, supporting multiple wallets per user.
• Developed core features for card (token) addition and management inside wallets.
• Built APIs for:
  PNO Certificate Acknowledgment
  Eligibility Check (including multi-service validation)
  Digitization (card tokenization)
  Provisioning
  Notify Provision
  Get/Verify Activation
• Implemented status update tracking for every stage in the card lifecycle.
• Integrated end-to-end flows with VTS and MDES simulators.
• Developed admin APIs to onboard, verify, and manage OEMs.
• Integrated role-based access, authentication/authorization, and session handling.
• Supported card suspension/termination actions based on suspicious activity.
• Implemented dashboard-level reports for token, wallet, and consumer activity.
• Designed filters for fetching data by date range, OEM, status, etc.
• Provided granular reports (daily, monthly, yearly).

Role: Backend Developer
Technologies: Java, Spring Boot, Microservices, NFC, REST APIs

Adapted the existing HCE-based wallet solution to support wearable payment devices like wristwatches using Secure Element (SE) technology. Payment was facilitated using slot-based management for devices with embedded security chips.

• Developed services for slot creation, mapping, and delinking tied to wearable devices.
• Modified provisioning logic to accommodate slot-based card/token provisioning.
• Handled lifecycle events (provisioning, activation, suspension) similarly to HCE mobile, with changes in device authentication and slot validation.
• Integrated modified flows with existing wallet and card management systems, maintaining consistency and security.

Role: Backend Developer
Technologies: Java, Spring Boot, REST APIs, NFC, Microservices

Built an HCE-based digital wallet system for a microfinance banking client, primarily focusing on secure NFC transactions and digital card provisioning for underserved regions.

• Reused and customized existing HCE card lifecycle flow for client-specific use cases.
• Implemented APIs for user registration, wallet setup, card tokenization, and provisioning.
• Integrated services with VTS and MDES simulators for testing and validation.
• Optimized existing codebase to suit lightweight deployment environments with minimal resources.
• Focused on secure transaction flows, compliance checks, and efficient reporting systems.