Could you tell me about a tough technical challenge you overcame in the past, and how your learnings are applicable to Telegram Messenger?

Hard Difficulty

Hard questions require advanced understanding and critical thinking. Here, your problem-solving skills are key, as these questions often involve complex scenarios needing in-depth analysis and well-structured responses.

Technical question

Technical questions probe into your industry-specific knowledge and skills. They require precise answers and are an opportunity to show your expertise and practical abilities in your field.

Here's a Hint

Choose a complex technical problem you solved that demonstrates skills in security, scalability or communication systems - areas relevant to Telegram's core product.