We will share how we helped in UPI application modernization journey from monolith to microservices on Kubernetes. UPI is a unified payment interface that enables seamless and secure transactions across different platforms and banks. UPI was initially developed as a monolithic application, which means that it had a single codebase and a single deployment unit. However, as the demand for UPI increased, the monolithic architecture posed several challenges, such as:

– Lack of scalability: The application could not handle the growing number of transactions and users without adding more hardware resources, which was costly and inefficient.
– Lack of agility: The application development and deployment cycle was slow and complex, as any change in the code required rebuilding and redeploying the entire application, which increased the risk of errors and downtime.
– Lack of flexibility: The application was tightly coupled and had high dependencies, which made it difficult to modify or add new features without affecting the existing functionality.

To overcome these challenges, we engaged with software vendors to migrate UPI from monolith to microservices on Kubernetes. Microservices are small, independent, and loosely coupled services that communicate with each other through well-defined APIs. Kubernetes is an open-source platform that automates the deployment, scaling, and management of containerized applications. By adopting microservices on Kubernetes, we achieved several benefits, such as:

– Improved scalability: The application can handle any amount of load by scaling up or down the microservices based on the demand, without affecting the performance or availability of the system.
– Improved agility: The application development and deployment cycle is faster and simpler, as each microservice can be developed, tested, and deployed independently, without impacting the other services.
– Improved flexibility: The application can easily accommodate new requirements or changes by adding or modifying the microservices, without disrupting the existing functionality.

The migration process involved several steps, such as:

– Breaking down the monolithic application into smaller and cohesive microservices based on the business domains and functionalities.
– Designing and implementing the APIs for each microservice using RESTful principles and standards.
– Containerizing each microservice using Containers to ensure portability and consistency across different environments.
– Deploying and orchestrating the microservices on Kubernetes using Helm charts and Kubernetes manifests to automate the configuration and management of the application components.
– Implementing service discovery, load balancing, routing, security, monitoring, logging, and tracing for the microservices using Istio service mesh and other tools.

The migration process was not without challenges, such as:

– Managing the complexity and coordination of multiple microservices and their dependencies.
– Ensuring the consistency and reliability of data across different microservices using event-driven architecture and distributed transactions.
– Ensuring the compatibility and interoperability of different microservices using versioning and contract testing.
– Ensuring the quality and performance of the application using automated testing and continuous integration/continuous delivery (CI/CD) pipelines.

However, we were able to overcome these challenges by following best practices and leveraging existing tools and frameworks. We also conducted regular reviews and feedback sessions with the stakeholders to ensure alignment with the business goals and expectations.

The migration project was a success, as we were able to deliver a modernized UPI application that is scalable, agile, flexible, resilient, secure, and easy to maintain. We also observed significant improvements in key metrics, such as:

– Reduced deployment time from hours to minutes
– Reduced downtime from days to seconds
– Increased throughput from thousands to millions of transactions per day

We are proud of our achievement and we hope that our experience can inspire others who are looking for similar solutions.
If you have any questions or comments about our project, please feel free to contact us.