Tarun Jhunjhunwala

• A microservice design-based market data project involving cruds, rule evaluation, real-time data streaming, and data reconciliation of GTT orders.
• End users can put in conditional GTT orders for any stock up to one-year validity, which the system will keep on evaluating until the condition is met.
• Real-time updates of the order were maintained through Kafka, and the final reconciliation of all the orders at the end of the day.
• This feature was rolled out to 10 million customers and handled around 100,000 orders per day.

• It is a one-stop self-care solution for recharge, bill payment, offer selection, and device purchase across categories like prepaid, postpaid, TV, and internet for multiple European countries.
• Designed and developed the end-to-end architecture of the back-end system for the business module of OneApp, which includes API gateway (Kong), authentication management (Keycloak), multiple microservices in Spring Boot containing business and presentation logic, databases, and caching layers.
• Designed the code from scratch to production in the multi-module system, including adapter-based support for multiple downstream APIs, their versioning, fault tolerance libraries like Resilience4j, exception handling, transactional logging, tenant-based properties, and environment support.
• The app has the active usage of around one million customers.