Death of the monolith

The PSS application was performing well, successfully supporting all business requirements, as well as expected service levels. The system had no issues in scaling with the organic growth of the business in the initial years.

The business has seen tremendous growth over a period of time. The fleet size increased significantly and new destinations got added to the network. As a result of this rapid growth, the number of bookings has gone up, resulting in a steep increase in transaction volumes--up to 200 to 500 fold of what was originally estimated.

Pain points

The rapid growth of business has eventually put the application under pressure. Odd stability issues and performance issues surfaced. New application releases started breaking the working code. Moreover, the cost of change and the speed of delivery profoundly started impacting the business operations.

An end-to-end architecture review was ordered, and exposed the weaknesses of the system as well as the root causes...