Morning.dev

DEV Community • 2026-04-18 09:50

I got 2x faster with AI. I also got 2x better at shipping bugs I couldn't catch.

I stared at a bug for 45 minutes last week that Claude had introduced three days earlier. The function looked fine. It passed my review. It even passed a quick manual test. It broke in production because the AI had confidently used an API method that doesn't exist in the version we were running, and I had no idea because the code read like it was written by someone who knew what they were doing. ...

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4m read

DEV Community • 2026-04-18 09:48

The State of Agentic Commerce — April 2026

In March, we crossed 3,000 verified stores and started seeing the first non-Shopify platforms in the directory. We said the next question was whether UCP would remain a Shopify story or become a real multi-platform standard. April answered that. We crossed 4,000 verified stores, Shopify migrated its entire fleet to the new v2026-04-08 spec in a four-day window, BigCommerce entered the directory w...

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11m read

DEV Community • 2026-04-18 09:43

Cloudflare Email Sending Is Now in Public Beta — OhRelay Fills the Gap It Left Behind

This article was originally published on OhRelay Insights. Cloudflare quietly opened its Email Sending feature to public beta this week. If you use Cloudflare Email Routing or build on Workers, this is worth understanding — both for what it adds and for what it still doesn't solve. What Cloudflare Email Sending actually is The new Email Sending service lets you send email program...

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4m read

Datetime Is Tech Debt You Didn't Know You Had

DEV Community • 2026-04-18 09:43

Datetime Is Tech Debt You Didn't Know You Had

Why This Matters Almost every developer has a datetime story. An appointment showing up an hour late. A report aggregating the wrong day's data. A notification firing at 3am. It works fine in development, ships, and then a user in a different timezone files a bug you can't immediately reproduce. A 2025 empirical study of real-world bugs in open-source software found that 53.6% of datet...

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6m read

DEV Community • 2026-04-18 09:42

The Real Reason People Reuse Passwords (And What I Built Instead)

The Real Reason People Reuse Passwords It's not laziness. It's a cognitive problem that the security industry mostly ignores. Everyone knows you shouldn't reuse passwords. It's been drilled into us for years in IT training slides, in pop-up warnings, in the aftermath of every major data breach. And yet, most people still do it. Not because they're careless. Not because they don't un...

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7m read

The RAG Chunking Strategy That Beat All the Trendy Ones in Production

DEV Community • 2026-04-18 09:40

The RAG Chunking Strategy That Beat All the Trendy Ones in Production

Book: Observability for LLM Applications — paperback and hardcover on Amazon · Ebook from Apr 22 My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub Every RAG tutorial shows you RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=200). Every team that ships one discovers the chunk_size nobody talk...

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10m read

DEV Community • 2026-04-18 09:32

I Built a TikTok Downloader with Go — Here's What I Learned

Why I Built ClipTool I needed a simple way to download TikTok videos without watermarks. Every existing tool was either: Full of ads and pop-ups Painfully slow (20-30 seconds per video) Didn't work on iPhone Safari So I built ClipTool — a free, fast TikTok downloader with zero ads. The Tech Stack Backend: Go 1.22 — chosen for its concurrency model Frontend: React + Vit...

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1m read

DEV Community • 2026-04-18 09:24

Beyond ChatGPT Wrappers: Building a Real Semantic Search API with ASP.NET Core and OpenAI Embeddings

Most developers jump straight to chat completions when they think "AI + backend." But the feature that's quietly changing how products work — semantic search — is more powerful, cheaper, and honestly more fun to build. The Problem with Keyword Search Imagine you're building a knowledge base for a SaaS product. A user types: "my account got locked". Your keyword search returns noth...

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6m read

DEV Community • 2026-04-18 09:23

AI Vocal Remover Benchmark 2026: 6 Tools Tested with Python (SDR + Speed)

A vocal remover is just a stem separator with the "everything except vocals" output thrown away. So why does picking one feel hard? Because the quality gap between tools is huge — bigger than the marketing pages let on — and almost nobody publishes numbers. I needed an answer for a side project, so I ran the same three tracks through six AI vocal removers and scored every output with mir_eval. He...

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11m read

DEV Community • 2026-04-18 09:22

What We Learned Building a Warm Period Calculator for the Web

A lot of cycle tools feel heavy, clinical, or built for app stores first. We wanted to test a calmer web experience, so we built Luna Bloom, a period calculator and cycle tracker that helps users estimate next period dates, ovulation timing, fertile windows, symptom history, and reminder flows in one place. The interesting part was product shape. 1. Calm beats clinical for repeat use ...

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2m read

DEV Community • 2026-04-18 09:21

What is RAG? A Beginner's Guide to Retrieval-Augmented Generation (With a Full Pipeline Walkthrough)

If you've ever wondered how ChatGPT-style apps can suddenly "know" about your company's internal documents, product manuals, or legal files without being retrained, the answer is almost always RAG — Retrieval-Augmented Generation. In this post, we'll break down what RAG is, why it exists, and walk through the full pipeline step-by-step with a real example. 1. What is RAG? Retrieva...

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10m read

DEV Community • 2026-04-18 09:20

Embeddings Explained: The Secret Language AI Uses to Understand the World

If you've ever wondered how ChatGPT "knows" that king and queen are related, or how Spotify recommends songs you actually like, the answer is almost always the same: embeddings. This post breaks down what embeddings are, how they work, where they're used, and what you can actually do with them — no PhD required. 1. What Are Embeddings? At their core, embeddings are just numbers — ...

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8m read

DEV Community • 2026-04-18 09:20

The Vitamin We Never Knew We Needed

I need you to understand something about queuosine, and I need you to not be bored, because it is extraordinary. Actually, let me build up to it. I was eating one of Marcus’s almond pastries — he left a container at the lab two days ago and I have been rationing them more successfully than I’ve managed anything else this year — and I was reading the PNAS dispatch that arrived in the morning tight...

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6m read

DEV Community • 2026-04-18 09:20

The Llama Trap: How Meta's Pivot to Closed-Source 'Muse Spark' Upends Thai Enterprise AI

Before you knew it, the age-old adage "there's no such thing as a free lunch" has once again proven true in the tech world. If your company has spent the last two years building AI customer service systems, Retrieval-Augmented Generation (RAG) pipelines, or internal knowledge bases on the back of Meta's Llama models, this news might require an emergency board meeting. The announcement of Meta Mus...

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6m read

DEV Community • 2026-04-18 09:18

Self-hosted analytics on Coolify with Umami

When we launched dacforge.com two days ago we shipped it with no analytics. No Google tag, no Plausible, no anything. The privacy posture on the home page said "we run our own infrastructure"; putting a third-party tracker on the site would have been a visible contradiction on line one. Two days in, that stance had already stopped being defensible. The site had traffic we could not explain, refer...

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6m read

The Ultimate NumPy Course: Zero to GPT in Pure NumPy

DEV Community • 2026-04-18 09:17

The Ultimate NumPy Course: Zero to GPT in Pure NumPy

I spent months building the NumPy course I wish existed when I was learning. **393 cells. 18 chapters. Zero to GPT in pure NumPy. One interactive notebook that takes you from "what is an array?" to implementing neural networks, transformers, and GPT from scratch — no frameworks, no hand-waving. Includes 11 bonus deep-dives, a real research paper reproduction, and portfolio-ready projects with in...

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1m read

DEV Community • 2026-04-18 09:12

The Loop That Ate My Computer

Let me tell you what happened the first time I wrote a loop. I wanted to print numbers from 1 to 10. Simple enough. I had just read about while loops. I thought I understood them. So I wrote this: number = 1 while number < 10: print(number) I ran it. Numbers started printing. 1, 2, 3... wait. Same numbers? 1, 1, 1, 1, 1, 1, 1, 1... The terminal filled up. Lines kept coming. The...

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8m read

DEV Community • 2026-04-18 09:02

⚠️ Race Conditions in APIs - The Bug You Can’t See

There's a category of bugs that don't show up in tests. They don't throw errors. They don't crash your server. They just silently corrupt your data at the exact moment two users do the same thing at the same time. That's a race condition. And if you've ever seen a user's account balance go wrong, a product's stock count go negative, or a post get double-liked - you've seen one in production. Le...

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6m read

DEV Community • 2026-04-18 09:00

Maximizing 1s with a Single Flip: An Elegant Application of Kadane's Algorithm

Have you ever encountered an algorithmic problem that seems to require a brute-force approach, only to realize it can be transformed into a classic computer science pattern? The "Maximum Ones after at most 1 flip" problem is a perfect example of this. Instead of checking every possible subarray to flip (which would take a sluggish O(N^2) time), we can reframe the problem and solve it in a bliste...

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3m read

DEV Community • 2026-04-18 09:00

Idempotency explained — Part 1: basics, idempotency key and Go implementation

The user clicks "Pay". Nothing happens. The network is slow, the spinner keeps spinning. They click again. This time it goes through. Your API received two identical requests 800ms apart. Two possible scenarios. Either your customer just got charged twice — and you have a legal problem, a chargeback to handle, and a difficult conversation ahead. Or you thought about idempotency, and the second re...

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10m read