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Senior Backend Engineer Interview Questions

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Consider this scenario: The greatest sporting event in history is about to take place – The World ChessBoxing Championship! The highlight of the event will be the Celebrity Mega-Match on Mars between Elon Musk and Mark Zuckerberg! Everyone knows who would win the chess game……but who would dominate in the ring? The world anxiously awaits to see these two tech monsters slug it out on another planet! This elimination tournament will begin with 300 matches happening simultaneously at various venues around the world. Each match will also be simultaneously live streamed to millions of viewers via the RTheyAliensInc app. Your task is to design a high-throughput, low latency, resilient, and scalable backend system that will deliver notifications. Specifications: - The events that need to be fired during the match are: - Major piece captured - Check and checkmate - Power punch landed - KO / TKO - Each user can set in their preferences how they want to receive notifications: a browser pop-up, an email, or a mobile push notification. - Each time a new notification event is fired, the web application will process and deliver notifications in batches according to the platform chosen by users (web, iOS, Android). - During high loads, the queue of messages that needs to be processed can start to swell and affect delivery timing, so special care must be taken to prevent lag and resource contention. We need a System Design capable of scaling to 300 notifications/second average and 1000 notifications/second peak.
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Senior Backend (PHP) Product Engineer

Interviewed at Chess.com

4.1★
Jan 31, 2024

Consider this scenario: The greatest sporting event in history is about to take place – The World ChessBoxing Championship! The highlight of the event will be the Celebrity Mega-Match on Mars between Elon Musk and Mark Zuckerberg! Everyone knows who would win the chess game……but who would dominate in the ring? The world anxiously awaits to see these two tech monsters slug it out on another planet! This elimination tournament will begin with 300 matches happening simultaneously at various venues around the world. Each match will also be simultaneously live streamed to millions of viewers via the RTheyAliensInc app. Your task is to design a high-throughput, low latency, resilient, and scalable backend system that will deliver notifications. Specifications: - The events that need to be fired during the match are: - Major piece captured - Check and checkmate - Power punch landed - KO / TKO - Each user can set in their preferences how they want to receive notifications: a browser pop-up, an email, or a mobile push notification. - Each time a new notification event is fired, the web application will process and deliver notifications in batches according to the platform chosen by users (web, iOS, Android). - During high loads, the queue of messages that needs to be processed can start to swell and affect delivery timing, so special care must be taken to prevent lag and resource contention. We need a System Design capable of scaling to 300 notifications/second average and 1000 notifications/second peak.

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