Recent posts tagged dataengineering

Originally published on DEV.to: https://dev.to/firfircelik/duckdb-20-vs-polars-vs-spark-on-one-machine-150m-rows-under-a-45-gib-cap-h38 DuckDB 2.0.0 shipped on October 21, 2026 announcementhttps://duckdb.org/2026/10/21/announcing-duckdb-200, PyPIhtt...

Advanced SQL analytics for running a hospital database. Introduction Structured Query Language is essential and common in most industry sectors. In healthcare reporting, SQL plays a critical role in analytics. PostgreSQL lets data scientists take ...

Originally published on DEV.to: https://dev.to/firfircelik/python-315-is-not-a-speed-release-for-data-teams-it-is-an-operations-release-5fbo Python 3.15.0 shipped on October 9, 2026 release posthttps://blog.python.org/2026/10/python-3150-final-is-he...

!Abstract brand-toned data pathway backdrop for the billion-row SQL decision framework.https://unrivaled-starlight-d655be.netlify.app/blog/visuals/billion-row-sql-hero.png?v=2 A query that returns in 40 milliseconds on ten million rows can time out...

What is a File Format? A file format defines how data is structured and stored so that software can read and write it consistently. Think of it as the container for your data. Just like music comes in MP3, WAV, or FLAC, data files also come in dif...

Data Modeling in Power BI Introduction At a time when data is rapidly generated by different activities ranging from experiments to business, more often do we get data in different formats and structures. The data may or may not be related dependi...

Introduction Most ML tutorials jump straight into models and algorithms. But here is what no one tells beginners: the model isn't where the magic happens. The data preparation is. Think of it this way. You wouldn't hand a toddler a jigsaw puzzle w...

If you've worked in data engineering long enough, you know the drill. Someone from marketing pings you on a Monday morning: "Hey, can you pull campaign spend by ad set for last week?" You run the query. Send it. Five minutes later: "Can we also add...

Introduction Most machine learning explanations start with algorithms. In this blog, let's start with a simpler question: how does anything learn? At its core, machine learning isn’t magic; it’s a set of strategies for turning data into behavior. ...

There is a quiet crisis unfolding in modern software architecture. On the surface, features are shipping faster than ever. Continuous Integration and Continuous Deployment CI/CD pipelines push updates dozens of times a day. Artificial intelligence to...

RAG Retrieval-Augmented Generation - a pattern where you fetch relevant documents before generating an answer lives or dies on retrieval quality. A cheaper retrieval stack isn't always a compromise. The Retrieval Quality Gap Is Often in the Chunking...

Hey CoderLegion community, When connecting LLMs or AI agents directly to production databases or third-party APIs like HubSpot, Stripe, or GitHub, two major problems usually pop up: Unsanitized PII/PHI leaks right into the model's context. Fragmented...

Introduction Microsoft Azure Virtual Machines VMs provide scalable cloud computing resources that allow users to deploy and manage operating systems in the cloud. In this project, I created an Ubuntu 22.04 Virtual Machine in Azure, connected to it u...

When "Latest" Isn't Actually Latest TL;DR In distributed systems, the last record your system processes is not always the most recent event that happened in reality. Understanding the difference between Event Time and Processing Time is essential...

> This is the narrated version of our free, interactive Data Engineer Roadmaphttps://petascalelabs.com/data-engineer-roadmap. Same areas, same order, with a focus on the one thing each layer asks of you that AI can't do for you. Every data engineer ...

Most engineers meet Apache Iceberg as a one-line answer: "it's the thing that gives you ACID transactions and time travel on object storage." That's true, and it's also where most people stop. But Iceberg has a version dial baked into every table - a...

The shape of the work right now !1https://coderlegion.com/?qa=blob&qablobid=14808488737358335165 Zenodo views: 1. Downloads: 0. No external citations to the ledger to date. The code still runs. That is the uncomfortable shape of this work right ...

While building my ETL pipeline project, I ran into a common beginner problem: Running Apache Airflow locally on Windows with Docker was painful. Problems included: Low disk space Docker setup issues Linux compatibility problems Environment deb...

Like many engineers, I started my job search with a simple idea: Apply to enough roles and eventually something will work out. The reality was more complicated. Some positions were already filled. Some never responded. Some required significantly ...

In modern software development, we take git for granted. We branch, we commit, we merge, and we roll back code seamlessly. But when it comes to the database layer, things get tricky. Databases have state—you can't just overwrite a production database...