Geeky Codes | AI Engineering, Data Engineering & Machine Learning Tutorials
Spark can process data across dozens or thousands of machines—but before any Executor can run your tasks, Spark needs a way to acquire and manage those resources. That is the job of a Cluster Manager. Introduction In the previous tutorials, we learned what Apache Spark is, why Spark can be faster than Hadoop MapReduce, and … Read more
The content discusses the evolution of AI engineer interview questions, shifting from basic LLM concepts to intricate topics involving AI agents. Key areas include the differences between agents and chatbots, the importance of state management, decision-making in agent design, tool selection, and handling infinite loops. Understanding these aspects is crucial for aspiring AI engineers.
This content serves as a comprehensive guide to retrieval strategies in Retrieval-Augmented Generation (RAG) systems. It contrasts sparse retrieval, which emphasizes keyword matching, and dense retrieval, focused on semantic understanding. Both strategies are essential for answering user queries effectively. The tutorial also highlights hybrid approaches for optimal performance.
Apache Spark is a distributed data processing engine that simplifies executing large-scale data pipelines through an organized structure. This structure includes a Driver for coordination, Cluster Manager for resource allocation, and Executors for data processing. Understanding the hierarchy of Application, Job, Stage, and Task is crucial for effective use of Spark.
Apache Spark’s dominance in big data processing stems from its innovative architecture, which optimizes distributed computation beyond simple speed. It utilizes in-memory processing, Directed Acyclic Graphs (DAGs), and multi-stage execution to efficiently manage complex workloads. Unlike Hadoop, Spark’s architecture supports improved query optimization, caching, and parallel processing, offering a more versatile computing model.
The most-cited AI deployment in enterprise history has a second chapter almost nobody reads carefully — and it isn’t the story you think it is. On 27 February 2024, Klarna published a press release that would end up in more consulting decks than possibly any other document of the AI era. The Swedish buy-now-pay-later company … Read more
From documents to embeddings, retrieval, reranking, prompt construction, and grounded answers — a practical walkthrough of how modern RAG pipelines actually work. Introduction In the previous article, we looked at Why LLMs Hallucinate is and why RAG has become one of the most important architectures for building LLM applications. But knowing what RAG is isn’t … Read more
Learn what Apache Spark is, why it has become the standard for big data processing, how it works at a high level, and where it fits into today’s data engineering ecosystem. Introduction If you’ve started exploring data engineering, you’ve probably noticed one technology appearing everywhere—Apache Spark. Whether you’re working with Databricks, Delta Lake, Azure Data … Read more
Learn why ChatGPT, Claude, Gemini, and Llama sometimes generate incorrect information, what causes hallucinations, and how production AI engineers minimize them using RAG, grounding, guardrails, and evaluation. Find all tutorials here Table of Contents Introduction If you’ve used ChatGPT long enough, you’ve probably experienced something like this. You ask: Who won the FIFA World Cup in … Read more
Learn how RAG works, why LLMs hallucinate, and build your first Retrieval-Augmented Generation pipeline in Python. Find all tutorials here Introduction Large Language Models (LLMs) have transformed how we build AI applications. Today, we can ask models to: Tools like ChatGPT, Claude, Gemini, and Llama make these tasks feel almost magical. But there’s one major … Read more
After the fundamentals, RAG, LLM inference, and GenAI architecture questions, here are 20 fresh AI Engineer interview questions designed to test whether you can reason about real-world AI systems — not just explain frameworks. Part 1: AI Engineer Interview Questions Part 2: AI Engineer Interview QuestionsPart 3: AI Engineer Interview QuestionsPart 4: AI Engineer Interview Questions Part 5: AI … Read more
After interviewing 50+ AI Engineer candidates, I noticed a pattern: impressive GenAI projects can get you through the first 10 minutes—but strong fundamentals are what separate candidates who build AI systems from those who truly understand them. I’ve interviewed 50+ AI Engineer candidates over the past few months. Almost every resume looked impressive. RAG. AI … Read more
When your LLM returns malformed JSON, the problem isn’t always the model. Here’s how to build structured, validated, and production-ready outputs with Pydantic and Instructor. Your LLM application works perfectly in development. You deploy it. A few hours later, production logs start filling up with errors: Or perhaps: The frustrating part? The model’s answer looks … Read more
To prepare for TCS NQT effectively in just 10 days, focus on mastering key coding patterns rather than trying to learn everything. Prioritize essential topics like number manipulation, strings, and arrays. Utilize previous year questions for practice, simulate exam conditions, and revise weak areas. The goal is efficient preparation and confidence under pressure.
A practical guide to reducing cloud spend without sacrificing performance, reliability, or SLAs A Databricks ETL pipeline can be technically optimized and still be financially inefficient. You may reduce a Spark job from 90 minutes to 30 minutes—but if the optimized version uses a cluster that costs three times as much, your cloud bill may … Read more
This series emphasizes the importance of practical knowledge in Data Engineering interviews, focusing on scenario-based questions that assess candidates’ ability to design and manage data pipelines. Key topics include pipeline architecture, incremental loading, Change Data Capture (CDC), Delta Lake functionalities, and monitoring strategies, highlighting the need for a comprehensive understanding of data lifecycles.
Data Engineering interviews at mid-to-senior levels focus on complex real-world problems beyond basic SQL and ETL. Key topics include performance bottlenecks, data skew, and using SQL window functions like ROW_NUMBER(), RANK(), and DENSE_RANK(). Candidates must demonstrate their understanding of optimizing Spark jobs and partitioning strategies in data management.
A practical framework for debugging hallucinations in production RAG systems—from retrieval and chunking to prompts, generation, evaluation, and governance Part 1: AI Engineer Interview Questions Part 2: AI Engineer Interview QuestionsPart 3: AI Engineer Interview QuestionsPart 4: AI Engineer Interview Questions Part 5: AI Engineer Interview Questions One of the most interesting questions I have seen in … Read more
A practical framework for turning ambiguous business problems into production-ready ML solutions Part 1: AI Engineer Interview Questions Part 2: AI Engineer Interview QuestionsPart 3: AI Engineer Interview QuestionsPart 4: AI Engineer Interview Questions Part 5: AI Engineer Interview Questions I recently came across an AI Engineer interview question that sounded deceptively simple: “Your movie is releasing … Read more
In Part 1, we covered the fundamentals of Spark, PySpark, Databricks, DAGs, lazy evaluation, partitioning, data skew, salting, AQE, migration validation, and common PySpark coding questions. But experienced Data Engineer interviews usually go one level deeper. Interviewers want to know: Can you actually design, optimize, and troubleshoot a production data platform? In this article, we’ll cover … Read more