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WTF Is Everyone Talking About? A developer dictionary that doesn’t suck

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Cheat sheet for dev terms that actually makes sense! Psst… nobody actually knows all these terms at first

WTF Is Everyone Talking About? A developer dictionary that doesn’t suck

Hey folks! 👋

Back when I first started coding, I felt like everyone was speaking a secret language. Meetings were full of words like “Agile,” “SEO,” “Tech Debt,” and I’d just nod like 😃 “Yep, totally get it…” (Spoiler: I didn’t.)

So here’s my no-bs cheat sheet for dev vocabulary that nobody bothered to explain to me. Bookmark this if you’re new—or just pretend you’ve known these all along (we’ve all been there).

🤹 “We Work in Agile”

(Translation: “We pretend to be organized, but chaos reigns.”)

  • Agile = A way to manage projects by breaking them into tiny chunks (called sprints), so you can panic every 2 weeks instead of all at once.
  • Scrum = A subtype of Agile where you stand in daily meetings (stand-ups) and say what you did yesterday (aka “I Googled errors for 4 hours”).
  • Kanban = Fancy word for a to-do list with columns like “Doing,” “Done,” and “Why Is This Still Here?”

(Fun fact: My first sprint felt like running a marathon… backwards.)

🔍 “The SEO Needs Work”

(Translation: “Google hates our website.”)

  • SEO (Search Engine Optimization) = The dark art of making your site show up on Google. Involves witchcraft (meta tags, keywords, and backlinks).
  • Semantic HTML = Using <article> instead of <div id="thingy"> so screen readers and Google don’t get confused.

(Pro tip: If your site looks like a 1999 GeoCities page, SEO won’t save you.)

💸 “Let’s Avoid Tech Debt”

(Translation: “We cut corners, and now we’re paying for it.”)

  • Tech Debt = When you write janky code to hit a deadline, and future-you hates past-you for it. Like taking a loan… but the interest is bugs.
  • Refactoring = Rewriting code so it doesn’t look like a toddler’s finger-painting.
  • Legacy Code = Ancient code nobody understands, but it somehow still runs. (“Don’t touch it—it might explode.”)

🎨 “The Design System is Broken”

(Translation: “The CSS is a war zone.”)

  • Design System = A set of reusable UI components (buttons, cards, etc.) so your app doesn’t look like 5 different devs styled it.
  • BEM = A CSS naming convention like .block__element--modifier. Sounds weird, but it keeps your sanity intact.

❤️ “We Use Open Source”

(Translation: “We didn’t build this, but thanks, strangers on GitHub!”)

  • Open Source = Code that’s free to use/modify. Like React, VS Code, or that random npm package you definitely checked for malware.
  • npm/yarn = Tool to install JavaScript packages. Also where node_modules goes to eat your hard drive.
  • MIT License = “Do whatever, just don’t sue us.”

🚨 “It’s a P0 Bug!”

(Translation: “Drop your coffee—the site’s on fire.”)

  • P0/P1/P2 Bugs = Priority levels. P0 means “fix this or we all lose our jobs.” P2 means “maybe next year… or never.”
  • Hotfix =
  • Regression = When you fix a bug but accidentally resurrect an older bug like a zombie apocalypse.

🐳 “We Need to Dockerize This”

(Translation: “Let’s wrap our app in a digital burrito so it runs anywhere.”)

  • Docker = Tool to package apps with all their dependencies (so they work the same on your laptop and a server).
  • Kubernetes (k8s) = Docker’s overachieving cousin—manages containers at scale. (Also, a great way to make your resume sound fancy.)
  • Microservices = When you break an app into tiny, independent pieces so one crash doesn’t doom everything. (In theory.)

💀 “The API Is Down”

(Translation: “Our app is now a brick.”)

  • API = A way for apps to talk to each other. Like a waiter taking orders between the kitchen (server) and your table (frontend).

  • REST = A common API design style. GraphQL = REST’s hipster sibling—asks for exactly the data it wants. GET, POST, PUT…

  • GraphQL = REST’s hipster cousin. Only wants the data it needs, with zero extra calories

  • Endpoint = A URL where an API “listens” (e.g., https://api.cats.com/v1/meow).

  • Rate Limiting = When an API says “slow down, buddy” after you spam it too much.

  • DDoS = When so many requests hit your server that it collapses. Sometimes intentional. Always bad

  • Websockets = Real-time communication between browser and server. Used for chat apps, games…

🔬 “Let’s A/B Test This”

(Translation: “We’ll guilt-trip users into clicking the red button.”)

  • A/B Testing = Showing 50% of users Version A and 50% Version B to see which one doesn’t flop.
  • CTA (Call to Action) = The button you really want users to click (“Sign Up!”, “Buy Now!”, “Please, just click something!”).
  • Bounce Rate = When users visit your site and leave faster than a bad date.

🐢 “Our CDN Is Slow”

(Translation: “The internet is buffering like it’s 2005.”)

  • CDN (Content Delivery Network) = Servers around the world that cache your site’s files so Australians don’t wait 10 seconds for your CSS.
  • Cache = Temporary storage (like your browser remembering a site so it loads faster next time).
  • Cache Invalidation = The art of clearing cached stuff when it’s outdated. (Often done by smashing keyboards.)

🦄 “Just Polyfill It”

(Translation: “Make this work in IE, even if it kills us.”)

  • Polyfill = Code that fakes modern features for older browsers. Like giving IE11 a fake mustache to sneak into the club.
  • Transpiler = Converts modern code (ES6) into older JS so grandpa browsers understand it. Babel is the OG here.
  • Ponyfill = A polyfill that doesn’t pollute global scope. (Yes, this is a real term.)

🔫 “That’s a Footgun”

(Translation: “This code lets you shoot yourself in the foot… easily.”)

  • Footgun = A feature/tool that’s dangerously easy to misuse. (Example: JavaScript’s == vs ===.)
  • Yak Shaving = Doing 10 pointless tasks to fix one tiny thing. (Example: Updating npm to fix a bug… but now Webpack won’t compile… and suddenly it’s 3 AM.)
  • Bikeshedding = Arguing endlessly about trivial stuff (“Should the button be #FF0000 or #CC0033?”) while ignoring big problems.

🚀 “We’re Going Headless”

(Translation: “We’re fancy now.”)

  • Headless CMS = A backend for content (like blog posts) that doesn’t care how the frontend looks. Popular ones: Sanity, Contentful.
  • Headless Browser = A browser without a UI (used for testing/scraping). Puppeteer is the celeb here.
  • JAMstack = Building sites with JavaScript, APIs, and Markup. (Basically, “let’s make static sites dynamic.”)

🍝 “It’s Just Spaghetti Code”

(Translation: “The previous dev was a chaos gremlin.”)

  • Spaghetti Code = A tangled mess where changing one line breaks 12 unrelated things.

  • Lasagna Code = Over-engineered layers of abstraction (the opposite problem).

  • Rubber Duck Debugging = Explaining your code to a rubber duck (or a patient coworker) to find the bug yourself. (Works scarily well.)

  • DRY = (Don’t Repeat Yourself) A coding mantra to avoid writing the same thing twice.

  • Tree-Shaking = The build process shakes out unused code.

☁️ “The Cloud Isn’t Magic” (DevOps & Infrastructure)”

(Translation: “It’s just someone else’s computer.”)

  • AWS/GCP/Azure = Cloud providers that rent you servers (and charge you $5,000 if you forget to turn them off).

  • Serverless = A lie—there are still servers, but you don’t manage them. Like AWS Lambda (“run code without crying over Linux updates”).

  • Load Balancer = Traffic cop for your servers, so one doesn’t get crushed while others nap.

🧮 “Big O, Big Problems” (Algorithms & Performance)

(Translation: “Your code is slow. Here’s why.”)

  • Big O Notation = Measures how slow your algorithm gets as data grows.

    • O(1) = Lightning fast (“lookup by key in a dictionary”).
    • O(n) = “Eh, not terrible” (looping through an array once).
    • O(n²) = “Why is my laptop smoking?” (nested loops).
    • O(n!) = “Burn it with fire” (traveling salesman brute force).

  • Optimization = The art of making O(n²) into O(n log n) so your app doesn’t crash.

  • Premature Optimization = Obsessing over speed before your code even works. (Don’t be this person.)

🤖 Bonus: Acronyms That Sound Like Sci-Fi

  • CRUD = Create, Read, Update, Delete (basic app functions). Pronounced “krud”
  • CORS = Browser security rule that loves to ruin your day. Pronounced “kors”
  • SSR = Server-Side Rendering (HTML built on the server). CSR = Client-Side Rendering (HTML built in the browser). Pronounced “S-S-R” / “C-S-R”
  • TTFB = Time To First Byte (how long your site takes to start loading). Pronounced “T-T-F-B”
  • WYSIWYG = “What You See Is What You Get” (like WordPress’s editor). Pronounced “wizzy-wig”

Want me to add even more obscure terms? Like “CI/CD” or “WebAssembly”? DM me on (@saida_codes) and let me know! 😄

Want this as a PDF cheat sheet? Download 900+ devs already stole it ;)