Goods and Service Tax (GST) was the largest indirect tax reform in the history of India. The reform mandated integration of entire nation’s diverse tax portfolio into a single taxation system. This brought upon a massive complexity in developing an IT platform, to handle not only the diverse tax systems of 36 States/Union Territories & Union Government, but also needed providing a single interface for more than a crore taxpayers’ for their GST compliance functions. Goods and Services tax Network (GSTN) was entrusted to build such a platform to service the need of diverse set of stakeholders. The responsibilities include and not limited to the following: • GST System Application design, development and operation • Taxpayer Migration from erstwhile regime to GST regime • IT Infrastructure procurement, commissioning with state-of-an-art Security apparatus • Systemic resilience against failures and Disaster Recovery mechanism • Helpdesk Setup and Operations • Training and Capacity Building • GST Eco-System creation and management (GSPs) • Backend system for 27 States/UTs for assessments, appeal etc.