Freecodecamp · Blogs

Blogs listings from Freecodecamp on TechiSeek. 144 public listings.

• Why 2D Trapped-Ion Quantum Computers Could Be Easier to Scale Than 1D Architectures (Freecodecamp)
  I still remember the first time I ran a Bell-state circuit on a quantum simulator. The code was only a few lines long, but it felt magical.
• How to Build an AI Feature With Gemini: A Practical Guide to Prompt Engineering for Developers (Freecodecamp)
  Most prompt engineering tutorials follow the same shape. Install the SDK, paste your API key, call generateContent, and print the response.
• What is Endianness? Big-Endian vs Little-Endian Explained with Examples (Freecodecamp)
  From these simple pieces we can build incredibly complex connected computer systems to render videos, show text from around the world, and…
• How Wearables Track the Menstrual Cycle: The Sensors, the Algorithms, and the Accuracy Gap (Freecodecamp)
  Your Garmin shows poor recovery, WHOOP paints your day red, your resting heart rate is high, your HRV is low, and the app recommends that y…
• What is Agentic AI? How AI Is Evolving From Chatbot to Co-Worker (Freecodecamp)
  It is planning, deciding, and acting on its own. This new kind of AI is called agentic AI, and it is quickly becoming one of the most impor…
• Why Your “Simple Deploy” Turned Into a Week of Infrastructure Work (Freecodecamp)
  If you're running production workloads, this guide is for you. It's not about side projects, early-stage experiments, or a single-service a…
• Advanced Dart: Learn Asynchronous Programming with Streams, Isolates, and the Event Loop (Freecodecamp)
  I had been writing Flutter apps for over a year before I actually understood how Dart handles concurrency.
• How to Build a Dark Mode Toggle Without JavaScript (Freecodecamp)
  Over the years, I've worked on many Static Site Generated (SSG) websites that work without JavaScript.
• The Real Infrastructure Behind Remote Work (It’s Not Just Wi-Fi) (Freecodecamp)
  Remote work looks simple from the outside: a laptop, a quiet corner, and a stable Wi-Fi connection.
• I Added a CDN Cache to My Site and It Got Slower. Here's the Math I Should Have Done First. (Freecodecamp)
  Last week I put a CDN cache in front of a static site, expecting it to get faster.
• How MCP Is Changing WordPress Development (Freecodecamp)
  For years, the promise of AI-assisted development felt just out of reach for WordPress developers.
• How to Protect Your GitHub Repos Against Malicious Clones (Freecodecamp)
  The world of open-source development comes with various cyber threats. GitHub is still facing a type of attack that is ongoing since last y…
• AI Paper Review: Training Language Models to Follow Instructions with Human Feedback (InstructGPT) (Freecodecamp)
  GPT-3 was a major breakthrough in natural language processing.
• What Happens During a Production Deployment? A Behind-the-Scenes Guide (Freecodecamp)
  A few minutes later, it is live for real users. Between those two moments runs a long chain of machinery: builds, artefacts, migrations, he…
• Product Experimentation at Scale: How Airbnb, Netflix, Lyft, and Uber run Causal Inference on (Freecodecamp)
  Causal inference for LLM-based AI features is no longer theoretical.
• Open Source Tools Every STEM Student Should Know About (Freecodecamp)
  Technology has changed the way students learn science, mathematics, engineering, and computer science.
• AI Paper Review: Language Models are Few-Shot Learners (GPT-3) (Freecodecamp)
  After GPT-2, it became clear that language models could do much more than researchers originally expected.
• How to Stop Your AI Coding Agent from Writing Outdated Code with Modern Web Guidance (Freecodecamp)
  AI coding agents can save developers a lot of time – that is, until you open the output and realize they've written code like it's 2019.
• What “Production-Ready” Actually Means in Flutter (Freecodecamp)
  It had a clean UI, smooth animations, and every flow worked exactly as I intended. I handed it to real users and felt good about it.
• How to Build More Accessible Websites with WCAG 2.2 (Freecodecamp)
  A website can look polished, work perfectly with a mouse, and still be difficult for some people to use.
• Top AI Productivity Tools for Developers and Professionals (Freecodecamp)
  Artificial intelligence has moved far beyond simple chatbots and basic automation.
• How to Use React Helmet (Freecodecamp)
  Because of the nature of single page applications (SPAs), modifying metadata in React apps can be tricky without using a helper library.
• How Large-Scale Platforms Handle Millions of Daily Transactions (Freecodecamp)
  Every day, millions of people order food, stream videos, send messages, book rides, make payments, and shop online.
• The Hidden Engineering Behind Every AI Product: What Software Engineers Should Know (Freecodecamp)
  AI products often look simple from the outside. You type a question into ChatGPT and get an answer.
• What is a JSON Schema? (Freecodecamp)
  If you're a developer, you likely work with JSON a lot. But how do you define and validate JSON and prevent problems from malformed JSON da…
• Why Computers Can’t Count Money (Freecodecamp)
  Computers are incredibly fast, but they have a surprising, fundamental flaw when it comes to counting money.
• The Paper That Created Modern AI: The Story Behind the Transformer (Freecodecamp)
  Every time you interact with a modern AI model you are relying on an architecture born from a single 2017 research paper titled "Attention…
• Flutter Frontend Systems Design: How to Think Like a Senior Engineer in the AI Age (Freecodecamp)
  Systems design has always been treated as a backend problem.
• Why "It Worked on My Machine" Still Happens in 2026 (Freecodecamp)
  Every engineering team has said it at least once: "It works on my machine." The phrase has become a running joke in software, but it's rare…
• AI Paper Review: Language Models are Unsupervised Multitask Learners (GPT-2) (Freecodecamp)
  Before models like ChatGPT became part of everyday life, AI systems were already getting surprisingly good at generating text.
• From Mixtral to Kimi K3: How Mixture-of-Experts Models Evolved (Freecodecamp)
  Open-weight Mixture-of-Experts models have expanded at a remarkable pace: Mixtral had about 47 billion total parameters, Deep Seek-V3 reach…
• Why You Should Never Send Emails Inside Your API Requests (Freecodecamp)
  Your signup endpoint looks fine in development. A user registers, you save the row, you call your email provider, and you return 201 Create…
• 7 Tools Digital Nomads Need in 2026 (Freecodecamp)
  Digital nomadism has changed dramatically over the last few years.
• Top 5 Proxy Providers for Developers (Freecodecamp)
  Developers today build software in a world where the internet is fragmented. Websites change content based on geography.
• The Best Cloudflare Tunnel Alternatives (Freecodecamp)
  Cloudflare Tunnel is a secure tunneling solution that allows developers to expose local applications and private services to the internet w…
• How to Understand the Safe Integer Limit in JavaScript (Freecodecamp)
  According to the Stack overflow technology survey in 2025, JavaScript is one of the most widely used programming languages in the world.
• AI Paper Review: Deep Unsupervised Learning using Nonequilibrium Thermodynamics (Freecodecamp)
  Today, diffusion models power some of the most impressive AI systems ever built.
• How Contextual Embeddings and Hybrid Search Fix Retrieval Failures (Freecodecamp)
  If you’ve built a RAG (Retrieval-Augmented Generation) system in the past year, you’ve probably hit the wall where your LLM returns confide…
• Understanding the CAP Theorem: Consistency, Availability, and Partition Tolerance in System Design (Freecodecamp)
  In 1999, Eric Brewer made a claim that would shape how distributed systems would be designed for decades.
• Mobile Background Execution: iOS Background Modes, Android WorkManager, and Background Services in (Freecodecamp)
  Every mobile developer eventually hits the same wall: the app works perfectly when the user is looking at it.
• Key Technical Design Decisions for Building an Educational App with LLMs (Freecodecamp)
  Recently, I spent time prototyping an educational app using Claude Code.
• HRV Data Is Everywhere. Here's What It Actually Means (Freecodecamp)
  Of all the metrics receiving the most developer interest at present, there’s nothing like heart rate variability (HRV).
• How Declarative Partial Updates Work in HTML (Freecodecamp)
  The server doesn't need to build an entire page in memory before sending it to the browser.
• How to Handle Errors the Right Way in Flutter: A Practical Guide to Sealed Classes, Records, and (Freecodecamp)
  I used to think I was handling errors well in my Flutter apps. I was catching exceptions, logging them, and showing error messages to users.
• How to Get Your Side Project Seen and Gain Paying Users (Freecodecamp)
  In 2022, I built a small micro-SaaS in my spare time and eventually sold it for a few thousand dollars.
• Mastering JavaScript Dates and Times (Freecodecamp)
  Managing dates and times in JavaScript is notoriously tricky, often leading to subtle bugs that only surface once an application hits produ…
• How I Used Harness Engineering to Make Our Company AI-Native (Freecodecamp)
  Most companies say they want to "adopt AI". In practice this usually means a chatbot bolted onto a website.
• AI Paper Review: Improving Language Understanding by Generative Pre-Training (GPT-1) (Freecodecamp)
  We use AI tools all the time, whether it’s asking questions, generating images, or getting help with everyday tasks.
• Mastra vs LangChain: Building an AI Agent Pipeline and Analyzing the Data (Freecodecamp)
  A week ago, I saw this tweet: I had just shipped SupportMesh, a multi-tenant AI support platform built on Mastra, so I had opinions from pr…
• Common React Mistakes to Avoid (Freecodecamp)
  React is a highly popular and powerful JavaScript library for user interface development.