Apr 2023 – Jan 2026 · 2 yrs 9 mos · India

• Customer Query Bot (PFG)
• Led the end-to-end design & development of central data APIs (wallet, game history, user activity).
• Secured with OAuth2 + JWT and enforced SSO token checks on every call.
• Deployed to production, adopted by Paytm CST teams and external partners like Karix (WhatsApp Bot).
• Central Authentication System (CAS)
• Drove a major modernization initiative, upgrading multiple Spring Boot apps from Java 8 → 21 and Spring Boot 2.3 → 3.1.
• Migrated Spring Cloud to 2022.x, restructured Nacos integration, and introduced gRPC-based communication for secure discovery/config management.
• Upgraded Kafka, Feign, AWS SDK, and MySQL connectors, removing deprecated libraries, fixing security issues, and improving performance.
• CAS – User
• Integrated Truecaller V2 Authentication at login.
• Designed a scalable User Creation Flow using the Handler pattern, instrumented with Prometheus metrics.
• Automated secure OAuth token generation post user creation.
• CAS – Blacklist
• Migrated the User Block/Unblock panel from an external tool to a robust in-house solution.
• Geo-Location
• Built real-time Geo-Location validation using Google’s API to block access from restricted regions, ensuring regulatory compliance without disrupting user experience.
• Growth
• Designed duration-based Game Tickets (auto-expiry if unused), boosting task completion and engagement.
• Streamed user activity data to CleverTap for behavioral analysis, enabling VIP vs. non-VIP segmentation and targeted marketing.
• Developed a Dynamic Slab-Based Reward System with automated allocation, scaling from local cache to Redis for fast and personalized incentives.
• Wallet
• Implemented a Success Rate Calculation feature using InfluxDB and transaction status tracking, reducing pending/failed payments by 30%+, and significantly improving the overall payment experience.

Jan 2022 – Mar 2023 · 1 yr 2 mos · Bengaluru, Karnataka, India

• Bank Details Integration: Built and integrated the Bank Details Tab with Razorpay inside the in-house Fountain Manager using Vaadin, delivering a seamless and secure payment management experience.
• Batch Processing: Developed robust batch processing for large data volumes, leveraging Hessian proxy to integrate with multiple APIs and external systems for smooth data exchange.
• Seller API Optimization: Revamped the Seller-API, achieving 95% faster data retrieval from the database.
• Order Tokenization: Added a feature to return and assign unique tokens/order numbers for every order, improving tracking and customer experience.
• POS for My Chai Corner: Configured and optimized the POS system using Redis caching, cutting database calls and boosting performance and responsiveness.
• Seller CRUD APIs: Built a full set of CRUD APIs (e.g., Swiggy, Zomato, Dunzo) to efficiently manage seller-to-store mappings across online and offline channels.
• ONDC Flows: Designed and developed end-to-end ONDC flows (Cart, Order, Payment) from scratch, integrated with AWS SQS/SNS, and exposed APIs to ONDC for scalable digital commerce.
• AWS Queue Processing: Created comprehensive flows to send, poll, and process messages in AWS Queues, using Lambda functions to automate triggers and streamline data workflows.