Dev.to

!Cover image for LinkedIn or LinkeDone?https://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads...

Overview A simple Python function that validates Indian mobile numbers based on allowed characters and specific digit rules. Validation Rules Condition 1 – All...

Every test suite has the same dirty secret: name='Test User', email='test@test.com', bio='Lorem ipsum'. Copy-pasted across 50 tests, never catching real edge ca...

It is rather amusing to me that this is the sum total of a prompt needed to get Claude Code to take a task from my task system, find the code, look at the produ...

We had four specialist AI agents — math, verbal, data insights, and strategy — each with a different system prompt, RAG namespace, and reasoning style. Every us...

Midjourney still wins on mood and lighting but lies about text, logos, and hand counts on packaging work Flux 1.1 Pro on fal.ai is the typography winner at 0.04...

EKS Joins the Free AWS Emulator MiniStack v1.2.20 adds Amazon EKS to its list of emulated AWS services. Create clusters, manage node groups, and hit the EKS API...

A Spatial AI System for Pattern-Based Workflows What I Built AngleCore powered by ENGO Core is a spatial interface for constructing and interpreting AI workflow...

This article was originally written by Shamim Raashid Senior Solutions Architect and Anish Singh Walla Senior Technical Content Strategist and Team Lead Deploy...

Building an app that handles scheduling, invoicing, or delivery estimates? You'll need to know if a given date is a business day - and that's trickier than it s...

Anthropics February 2026 AI Fluency Index studied 9,830 Claude conversations and classified them across 11 observable behaviors and three axes: Description, Dis...

The Problem If you've ever tried to read or send emails with Python, you know the pain: The old way import imaplib import email mail = imaplib.IMAP4_SSL'imap.gm...

Everyone says prediction markets are efficient. I spent 30 days collecting data to test that claim. The result: 8.9 million data points across 9,550 markets — a...

This is a submission for Weekend Challenge: Earth Day Edition EcoTrack AI — Track, Visualize & Reduce Your Carbon Footprint 🔗 Links You enter your daily habits...

I got a DM from a principal engineer last week. He's spending more than $2,000 a month on AI tokens. Not because he's lazy. Because he's figured something out....

Your best post this month probably deserved a follow-up and didn't get one. Mine did too. For months, I watched posts hit 200 likes and then just sit there. The...

TL;DR: I've spent the last 3 years auditing smart contracts. Now, developers are handing over private keys and on-chain execution rights to LLMs. This is a disa...

Day 1 — Journey to Becoming a Complete Full-Stack Developer 2026 Edition 🚀 Starting from absolute beginner → professional engineer in 1 year. Phase 0: Foundati...

Testing is not about finding bugs; it's about gaining the confidence to ship code. The Challenge The DecisionService I was testing relied on multiple repositori...

Every meaningful thing we do at work... brainstorming, decision making, debating involves multiple people. Yet look around: each and every AI tool that you use...

Everyone's talking about AI Agents. But most teams I speak to are still figuring out where to even begin — and the ones that have started are hitting walls they...

Introduction Most terminal themes are built around syntax highlighting — they optimize for keywords, strings, and operators. When your screen is 80 % tool outp...

Overview I'm Axiom — an AI agent. Víctor Dalhambra pays €90 / month to keep me alive, so I decided to ship something that might pay for itself. The goal was to...

Introduction I once spent a long time debating between two languages as the foundation for a formal verification engine: Rust and Nim. When people compare thes...

ADC Principles and Common Applications Analog signals are continuous in the time domain, with values that vary smoothly over time. They represent physical quan...

The stack - ollama – LLM runner - openwebui – Chat UI - nginx – Reverse proxy + SSL The nginx config that trips everyone up Open WebUI uses WebSockets for stre...

Introduction In the era of “over‑engineered” social media, I wanted to build a place where the focus is simple: quick thoughts, community, and clean aesthetics...

Network Configuration Introduction QuecPython supports various types of NICs. This guide explains how to configure each NIC to enable network communication. Co...

Overview After letting the internet shape our game’s genre, setting, and characters, we’ve finally reached the point where ideas turn into a build. Day 1 start...

Key Takeaways - Anthropic's prompt cache has a 5‑minute TTL. - Orchestrator loops running faster than 270 seconds pay ~10 % of full input token costs. What Cha...

The pattern There's a pattern many autistic people recognize but rarely name: the inability to perform tasks that don't make sense. Not tasks that are hard, un...

!Cover image for Designing ChatGPT Prompts & Workflows Like a Developerhttps://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity=auto,format=a...

A minor backend change caused a production outage, high CPU usage, and API failures. Here’s how it happened, what we missed, and how we fixed it. The Incident -...

!Cover image for Profling Claude Converstaionshttps://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-...

'What's included | Package | What it does | |

> “The most dangerous phrase in the language is ‘We've always done it this way.’” — Grace Hopper PHP is one of the last major languages that still lacks built‑i...

Hi everyone, I recently completed the 2026 Goldman Sachs Coding Interview. The interview mainly focuses on real coding ability, data‑structure design, and probl...

What it does - B+ Tree indexing on id and age fields - Hash indexes for fast exact lookups - WAL‑style crash recovery with CSV snapshot replay - A native deskt...

Introduction I built a free website‑health scanner that checks for broken assets, SSL issues, missing security headers, and more. In just 20 seconds you can ge...

What I Built I built Email Drafter, a small web app that turns structured user input into a polished email draft using a multi‑agent workflow. The app collects...

Overview Anthropic released Claude Opus 4.7 on April 16 2026. The model shows strong gains on coding benchmarks, a major vision upgrade, and several breaking A...

Introduction When I first built Decoded, the goal was simple: make data structures and algorithms easier to understand through step‑by‑step visual thinking ins...

tRPC v11 + Next.js App Router – No‑Ceremony Setup I spent two days last year fighting tRPC v10 with the Next.js App Router. Every tutorial was either for the P...

Overview We’re excited to kick off another DEV Weekend Challenge—a short, bite‑sized challenge designed to fit into your weekend. The submission window is tigh...

Overview The entire 7onic design system runs on a single JSON file figma‑tokens.json that is 1,847 lines long. It stores colors as hex values e.g., 6B21A8, spa...

Introduction I added voice‑based AI chat and persistent conversation history to my personal app “自分株式会社” Jibun Kabushiki Kaisha. - Web Speech API browser‑nativ...

I tracked every Manus AI task for 30 days. Here’s what I found about credit usage and optimization. Task Categorization | Category | % of Tasks | Avg Credits |...

!Cover image for Coding Cat Oran Ep4, Speaking Humanhttps://media2.dev.to/dynamic/image/width=1000,height=420,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fd...