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DEV Community · Technology

Your ESP32 Project Should Run for Months, Not Days

The Battery Life Gap ESP32 is not a low-power chip. It is a high-performance WiFi chip that can enter a low-power state. The distinction matters. When the ESP32 is awake, it draws 80-240mA depending on radio activity. In deep sleep, the datasheet promises 10μA. But 10μA is the number f...

張旭豐 55 minutes ago

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DEV Community · Technology

Why Does Your LED Installation Feel Disconnected?

Why Does Your LED Installation Feel Disconnected? You spend three weeks building the installation. Fifty ESP32 boards. Fifty LED strips. Every board programmed, every strip tested. You hit run. The waves move across the first ten boards in perfect sync. Then the delay kicks in. By board...

張旭豐 1 hour ago

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DEV Community · Technology

The 5-Stage System for Chasing Late Invoices (Without Burning Bridges)

Late payments are the silent killer of freelance businesses. You did the work. You sent the invoice. And now... crickets. Most freelancers either send one awkward follow-up email or go straight to threats. Both approaches fail. Here's the 5-stage escalation system that actually works: Sta...

Jason DePardo 1 hour ago

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DEV Community · Technology

How to Build a Professional Quote Request Form With File Upload for Your Small Business

Your customer wants a quote. They visit your website, fill in your contact form, and hit send. You get an email with their name and a vague description of what they need. But where is the logo file? Where is the artwork? Where is the reference photo of the job they want done? It is not there....

Allen Jones 1 hour ago

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DEV Community · Technology

ConfDroid Puppet Modules - SSH

Introducing confdroid_ssh: Reliable and Hardened SSH Access for Your Rocky 9 Servers SSH is the primary way we access and manage Linux servers. When SSH stops working, everything else grinds to a halt — troubleshooting becomes painful, and automation pipelines can fail. To solve this, I...

12ww1160 1 hour ago

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DEV Community · Technology

SAP Hybris Impex When None of Us on the Team Can Read It

I'm currently embedded as an external on a team that uses the Hybris Management Console — HMC for short — to administer a SAP Commerce environment. Every few days the shared environment gets refreshed from production, which is exactly what you want for most of the data, and exactly what you don't wa...

Aral Roca 1 hour ago

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DEV Community · Technology

Arrays in Javascript

What is an Array: An array is a collection of values stored in a single variable. Instead of creating multiple variables: let a = 10; let b = 20; let c = 30; we can use Array: let numbers=[10,20,30]; Creating an array using literal: Creating Empty Array: let a=[]; console.log...

Anees Abdul 1 hour ago

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DEV Community · Technology

RAG in Practice — Part 5: Build a RAG System in Practice

Part 5 of 8 — RAG Article Series ← Part 4: Chunking, Retrieval, and the Decisions That Break RAG · Part 6 (publishing soon) Why This Article Is Different By now, you already know what a RAG pipeline is. Part 3 gave you the full pipeline. Part 4 showed how chunking and retrieval deci...

Gursharan Singh 1 hour ago

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DEV Community · Technology

AI-Assisted Debugging in Next.js 16 with Experimental Agent DevTools

Next.js 16 introduces a foundational shift in how developers and AI agents interact with application state and debugging information. The Experimental Agent DevTools framework enables AI assistants to access React DevTools protocols and browser logs through a terminal-based interface, transforming t...

Meriç Cintosun 1 hour ago

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DEV Community · Technology

Building Scalable Blockchain Solutions with Go: A Developer's Journey

As a senior Go developer with nine years of industry experience, I've had the privilege of working on a wide range of complex projects, many of which revolved around creating scalable, high-performance systems. But the path to where I am now wasn’t always clear-cut. It’s been a journey filled with c...

Yehor A 1 hour ago

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DEV Community · Technology

Seu sistema é um castelo de cartas? Resolva com RabbitMQ

Você já sentiu que o seu sistema é um castelo de cartas? Onde a queda de um serviço de e-mail ou uma lentidão no processamento de notas fiscais trava toda a jornada de compra do seu cliente? Se a resposta for sim, você está lidando com um problema de acoplamento excessivo. No desenvolvimento de sof...

Daniel Camucatto 1 hour ago

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DEV Community · Technology

Consolidating Your Pipeline: Implementing Multi-Tenant Namespace Tunnels

IT InstaTunnel Team Published by our engineering team Consolidating Your Pipeline: Implementing Multi-Tenant Namespace Tunnels Consolidating Your Pipeline: Implementing Multi-Tenant Namespace Tunnels Stop managing a “Tunnel Forest.” Master the art of Namespace Tunneling to route an entire microservi...

InstaTunnel 1 hour ago

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DEV Community · Technology

I Built a Font Inspector Chrome Extension That Actually Identifies Japanese Fonts

There is a specific frustration that every frontend developer knows: you open a Japanese website, see a beautiful typeface, open DevTools, and font-family gives you "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Meiryo", sans-serif. Which of those is actually rendering? The browser picks the first a...

SHOTA 1 hour ago

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DEV Community · Technology

Introducing Plumbed, self-healing integrations in days, not months

If you’ve ever shipped a “finished” integration only to spend the next months babysitting it, you already know the real cost isn’t the build, it’s the uptime. At Plumbed.io, we’re building an AI-native integration platform that takes ownership of the full lifecycle: from prompt-driven setup to moni...

Sven March 1 hour ago

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DEV Community · Technology

Built a simple DDNS service because existing ones felt too complicated. https://rjuip.com

Hey everyone, I’ve been working a lot with ESP8266 projects and a small home server setup, and kept running into the same annoying issue — my public IP changing and breaking remote access. I tried a few DDNS services, but honestly: some were overcomplicated some had messy configs some didn’t pl...

Amit Vedante 2 hours ago

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DEV Community · Technology

Your AI Isn’t Dumb. It Just Doesn’t Think Twice.

This is a submission for the OpenClaw Challenge. What I Built Most AI systems don’t fail because they lack intelligence. They fail because they answer too quickly. We’ve optimized for speed—but not for thinking. So I built a minimal AI agent that does one simple thing differently: 👉...

Saras Growth Space 2 hours ago

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DEV Community · Technology

Build an Authorization Server with Bun, Hono, and OpenID Connect

Modern applications increasingly rely on OpenID Connect (OIDC) for secure, standards-based authentication. But most tutorials point you at hosted identity providers. What if you need to run your own authorization server maybe for a microservices platform, an internal tool, or simply to understand h...

ShyGyver 2 hours ago

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DEV Community · Technology

How to Build a Certificate Generator with HTML and CSS

Every course platform, bootcamp, and online community eventually needs the same thing: certificates. And most developers reach for one of these solutions: A design tool (Canva, Figma) — manual, doesn't scale PDF generation libraries (PDFKit, pdfmake) — painful layout control Canvas API — powerful...

Özgür S. 2 hours ago

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DEV Community · Technology

AtCoder Beginer Contest 454 参加記録と解答例（A~D問題）

本記事は、AtCoder Beginner Contest 454 (ABC454) に参加した際の、A〜D問題の復習と解答の備忘録です。コンテスト中に考えた解法の方針や、提出したPythonのコードについて整理しています。 A - Closed interval 配点 : 100 点 問題文 整数 L,R が与えられます。 L 以上 R 以下の整数がいくつあ...

iwamutsu256 2 hours ago

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DEV Community · Technology

I shipped a NuGet package, then rewrote it completely. Here's why.

If you work in fintech and process card transactions, you've seen MCC codes. Merchant Category Code- a four-digit number that tells you what kind of business charged the card. 5411 is a grocery store. 5812 is a restaurant. 7995 is a casino. Every product that touches transactions eventually needs t...

KitKeen 2 hours ago

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DEV Community · Technology

Deploying Under the Moonlight

There's something magical about a calm night walk that clears your mind. I was out, just enjoying the evening breeze and the peaceful streets. Suddenly, I realized a small but frustrating bug was bothering my personal project. Users were being forced to re-login every time my server restarted. Inst...

Tuan Do 2 hours ago

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DEV Community · Technology

ActionNode: A Real-Time Sustainability Command Center for Earth Day 2026

This is a submission for Weekend Challenge: Earth Day Edition What I Built ActionNode — a real-time sustainability dashboard that turns complex environmental data into personal, collective action. The app is built around Earth Day 2026's dual themes: "Planet vs. Plastics" and "Our Po...

venkat-training 2 hours ago

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DEV Community · Technology

Kubernetes Secrets Security: Why Built-in Secrets Fail in Production

This article was originally published on Ciro Cloud. Read the full version here. In 2023, a misconfigured Kubernetes cluster at a major fintech company exposed 50 million customer records. The attack vector: base64-encoded secrets stored in plain text in etcd. Kubernetes secrets security alone cann...

Ciro Veldran 2 hours ago

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DEV Community · Technology

Trenes de Japón: 28% de pasajeros viajan en riel por política, no cultura

Los trenes de Japón mueven el 28% de los pasajeros del país, una cifra que no tiene comparación en el mundo desarrollado. En Francia el porcentaje cae al 10%, en Alemania al 6.4% y en Estados Unidos apenas al 0.25%. La diferencia es tan grande que un viaje en Japón es cien veces más probable que sea...

lu1tr0n 2 hours ago

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