Director, Software Engineering, Site Reliability

LinkedIn

Let's dive into C++ and networking concepts, followed by a concurrency coding challenge. Part 1: C++ and Networking Fundamentals Explain the difference between TCP and UDP. Provide examples of applications that would be best suited for each protocol. For instance, why is TCP preferred for web browsing, while UDP is often used for online gaming? Describe the OSI model. What is the purpose of each layer, and how does data travel from the application layer on one machine to the application layer on another? What are sockets? Explain how they are used to establish network connections in C++. Provide a simple code example demonstrating how to create a socket and listen for incoming connections. Explain the concept of network address translation (NAT). How does NAT allow multiple devices on a private network to share a single public IP address? Discuss different types of network topologies. What are the advantages and disadvantages of star, bus, ring, and mesh topologies? Part 2: Concurrency Coding Challenge Implement a thread-safe queue in C++. The queue should support the following operations: enqueue(item): Adds an item to the back of the queue. dequeue(): Removes and returns the item at the front of the queue. If the queue is empty, it should block until an item becomes available. size(): Returns the number of items in the queue. Your implementation should be robust and handle concurrent access from multiple threads without data corruption or race conditions. Explain the synchronization primitives you have used (e.g., mutexes, condition variables) and why you chose them. Provide a basic example demonstrating how multiple threads can enqueue and dequeue items from your thread-safe queue concurrently.

LinkedIn

Let's design the LinkedIn feed. Consider the user experience, key features, scalability, and personalization aspects. For instance, how would you prioritize content from connections versus suggested content? How would you handle different content types like text, images, videos, and articles? How do you design a system to ensure that the feed remains responsive even with millions of active users? How would you personalize the feed to show users content they are most likely interested in, and what data would you use to achieve this personalization? Finally, how would you prevent the spread of misinformation or harmful content within the feed?

LinkedIn

Okay, let's explore your interest in LinkedIn. To help me understand your motivations, could you elaborate on why you are particularly interested in working at LinkedIn? I'm looking for specific reasons beyond just wanting a job. For instance, are you drawn to LinkedIn's mission of connecting professionals? Perhaps you're excited about the scale of the platform and the impact you could have on millions of users? Or maybe you admire the company's culture and values, such as its emphasis on transformation, integrity, collaboration, and results. It would be helpful to hear about specific projects or initiatives at LinkedIn that resonate with you. Have you been following LinkedIn's work in AI, education, or small business support? Are there any particular LinkedIn products that you find innovative or impactful? Are you inspired by the work of a specific team? Furthermore, how do you see your skills and experience aligning with LinkedIn's goals? What unique contributions do you believe you can make to the company, and how would working at LinkedIn help you grow professionally? I'm interested in understanding how your personal values align with LinkedIn's core principles, and why you believe this is the right place for you to advance your career.