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Grace Voyage is an online ticket operator that aggregates data across various Russian ticket providers and allows users to find best tickets available on target destination.
There are however a lot of pitfalls in development of such a service. Ticket providers have different APIs with different timeouts and a wide range of data formats (even exotic ones), there is no common naming conventions for places and destinations and wearout rates for tickets vary wildly. We managed to overcome these difficulties using machine learning and prediction algorithms for smart data caching.