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Dev Nexus Hub by Uma Mahesh
Dev Nexus Hub by Uma Mahesh

Connecting Developers to Architectural Excellence

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Dev Nexus Hub by Uma Mahesh
Dev Nexus Hub by Uma Mahesh

Connecting Developers to Architectural Excellence

  • Artificial Intelligence

Key Metrics in Machine Learning: Accuracy, Precision, Recall, and F1-Score

In Machine Learning interviews, evaluation metrics are not just a technical detail—they are a window into how you think about outcomes, risk, and real-world impact. Interviewers often ask about accuracy, precision, recall, and F1-score not to test formulas, but to…

  • Uma Mahesh
  • 12/28/2025
  • Artificial Intelligence

Supervised vs Unsupervised vs Reinforcement Learning

One of the most common—and deceptively simple—questions in AI & ML interviews is: “Can you explain the difference between supervised, unsupervised, and reinforcement learning?” While it appears basic, interviewers use this question to evaluate how you conceptualize learning problems, choose…

  • Uma Mahesh
  • 12/25/2025
  • Artificial Intelligence

Machine Learning vs Deep Learning vs Artificial Intelligence

Few topics expose shallow understanding in interviews faster than the question: “What is the difference between AI, Machine Learning, and Deep Learning?” On the surface, this sounds basic. In reality, interviewers use this question to assess conceptual clarity, systems thinking,…

  • Uma Mahesh
  • 12/21/2025
  • Artificial Intelligence

How Interviewers Evaluate AI & ML Answers

AI and Machine Learning interviews are rarely about getting the “right” answer. Instead, they are designed to uncover how you think, reason, and make decisions when building intelligent systems. Interviewers use AI & ML questions as a diagnostic tool—to assess…

  • Uma Mahesh
  • 12/18/2025
  • Artificial Intelligence

What Is Artificial Intelligence and Why It Matters in Interviews?

Artificial Intelligence (AI) is no longer a niche specialization reserved for research labs or data science teams—it has become a core competency evaluated across software engineering, architecture, data, and product roles. In modern technical interviews, AI is not tested merely…

  • Uma Mahesh
  • 12/14/2025
  • System Design

Design a “Likes” Counter for Social Media: Discusses designing a scalable likes counting system

In this case study, we examine the design of a scalable system for managing and counting “likes” on a social media platform. Such a system must handle high volumes of user interactions efficiently, ensuring reliability, low latency, and scalability to…

  • Uma Mahesh
  • 12/11/2025
  • System Design

System Design Case Study: Designing a Scalable Notification Service

1. Overview A scalable notification service is a critical backend component for modern applications, responsible for delivering timely, personalized messages to users across multiple channels (push notifications, email, SMS, in-app, WhatsApp, etc.). This system powers user engagement in products like…

  • Uma Mahesh
  • 12/07/2025
  • System Design

System Design Case Study: Designing a Distributed Job Scheduler

1. Overview A distributed job scheduler is a system that reliably executes tasks (jobs) at specified times or intervals across a cluster of machines. It powers background processing in virtually every large-scale application: cron jobs, ETL pipelines, report generation, cache…

  • Uma Mahesh
  • 12/04/2025
  • Cloud Computing

Overview of the Joint AWS-Google Cloud Multicloud Networking Solution

Amazon Web Services (AWS) and Google Cloud announced a groundbreaking, jointly engineered multicloud networking solution in late November 2025, currently available in public preview. This service delivers managed, private, high-bandwidth connectivity between the two clouds in minutes, eliminating the weeks…

  • Uma Mahesh
  • 12/03/2025
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