Received OA1 day after application. Completed it 4 days later, passing all the test cases. Received OA2 SDE Workplace Simulation 30mins after submission. Studied LPs (almost memorized) and completed OA2 couple of days later. I think I aced the OA2. However, received the rejection e-mail day after OA2 submission without any feedbacks.

It is just rude to send a cold rejection e-mail after taking such time. At least tell me which part of my application was incompetetent.