a guide to Object-Oriented Design (OOD) interview questions, providing insights from an experienced interviewer at major tech companies. It begins by explaining why OOD skills are crucial for software engineers and addresses common reasons why candidates find these questions challenging. The article then outlines a five-step approach to effectively answer OOD questions, emphasizing clarification, use cases, object identification, operation definition, and interaction mapping. Finally, the text presents ten popular OOD interview problems, ranging from designing an online shopping platform to a social network, and highlights key considerations interviewers look for in each scenario

discussing memory management concepts essential for software engineers. The speakers, Ahmed Elemam and Ahmed Abd Elhay, cover topics such as the stack and heap memory allocation methods, explaining their differences and use cases. They also explore virtual memory, clarifying how operating systems provide applications with the illusion of more memory than physically available and the performance implications of techniques like swapping. Furthermore, the conversation explores CPU cache levels and their significant impact on performance, illustrating how efficient data access patterns can dramatically improve execution speed through a matrix multiplication example. The speakers emphasize that memory access patterns are often more critical for performance optimization than complex code structures and recommend resources for further study on memory management and system architecture

Designing a Distributed Image Processing System on the Cloud

This is approached through a simulated dialogue between two individuals: one representing the client defining the core requirements, and the other acting as the system architect who analyzes and explains how to build the system. The discussion emphasizes the rationale for using a cloud-based environment instead of local hardware, particularly when dealing with complex image processing tasks.

Key system functionalities are identified, including image uploading, applying filters, and downloading the results. The text also presents various diagrams illustrating data flow and interactions between the system’s main components, with a particular focus on the design of the image processor module.

Finally, the conversation explores different failure scenarios across various system components and how to address them using previously studied design concepts and architectural patterns.