DEV Community • 2026-04-21 09:07

Build a Price Comparison Agent with BuyWhere API

Build a Price Comparison Agent with BuyWhere API Target audience: AI agent developers | UTM: utm_source=blog&utm_medium=content&utm_campaign=dev-post-1 Price comparison is one of the most requested capabilities in AI shopping assistants — and one of the hardest to build reliably. Web scraping breaks, retailer APIs are gated or nonexistent, and maintaining freshness across do...

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4m read
DEV Community • 2026-04-21 09:06

mnemospark e2e testing: OpenClaw in Action

This is a submission for the OpenClaw Challenge. What I Built While I was tightening up mnemospark inside OpenClaw, I kept running into the same practical truth: proving the command surface exists is not the same thing as proving the workflow is real. First a short primer on mnemospark so you can grok the context. I built an OpenClaw plugin that gives agents secure access to cloud st...

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6m read
DEV Community • 2026-04-21 09:06

1 RN Thing a Day – Day 12: useEffect vs useFocusEffect

useEffect React to data changes only useEffect(() => { // logic }, [dep]) ✅ Runs when: The component mounts The dependency (dep) changes ❌ Does NOT run when: The screen is revisited (focused again) Navigation happens without changing the dependency useFocusEffect useFocusEffect( useCallback(() => { // logic }, [dep]) ) ✅ Runs when: The screen becomes fo...

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DEV Community • 2026-04-21 09:05

I Built a Policy Drift Detector for LLM Agents. Here's What Four Versions Taught Me.

This is part of an ongoing series on drift_orchestrator — an open-source safety library for detecting behavioral drift in LLM-assisted operator loops. Previous posts covered the core architecture and the Semantic Gradient Evasion vulnerability class. The problem sounds simple: detect when an LLM agent's responses are gradually redefining the security policy it's supposed to be operating under....

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Echo JS • 2026-04-21 09:04

Precision Engineering Solutions in the Middle East: Trends, Technologies & Growth

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DEV Community • 2026-04-21 09:03

The Brutal Truth About 37 Dev.to Posts: What My "Second Brain" Project Really Taught Me

The Brutal Truth About 37 Dev.to Posts: What My "Second Brain" Project Really Taught Me Honestly, I've been sitting here staring at the screen for about 20 minutes now, wondering if I should even write this post. You see, I've just published my 37th Dev.to article about Papers, my "personal knowledge base" project. Thirty-seven. That's not a typo. Thirty-seven articles about the same pr...

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5m read
Embedded Linux Development - Part 6
DEV Community • 2026-04-21 09:03

Embedded Linux Development - Part 6

In this tutorial, I will continue to discuss embedded Linux development with ssh server activation. Previously, I've entered into BeagleBone Black over J1 serial header with a USB-UART converter. In here, I will show that how to enter into it with ssh command. Firstly, there are two important points that you have to do. I've already did these in previous tutorials. Firstly, I compiled the kernel ...

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DEV Community • 2026-04-21 09:01

Building a Lead Capture Form with n8n, Notion, and Slack

Building a Lead Capture Form with n8n, Notion, and Slack You need to capture leads from your website and get them into your database while notifying your team. Here's how to architect this integration in n8n using its Form Trigger, Notion API, and Slack API. Architecture Overview This workflow uses three components in a parallel execution pattern: [Form Submission] ...

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4m read
DEV Community • 2026-04-21 09:00

Why interviews expose your JS gaps

Interviews are not trying to trick you; they're just a highly effective JavaScript lie detector. You might be crushing it daily, shipping features, and building fantastic applications with all the modern frameworks. But then an interview question about this context or closures drops, and suddenly you feel like you've never written a line of JavaScript in your life. This isn't about failing; it's ...

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2m read
HackerNoon • 2026-04-21 09:00

AI’s Critical Role in Healthcare and Online Safety

AI is no longer optional in high-stakes systems like healthcare and online safety. From real-time medical documentation to detecting child exploitation at global scale, automation fills the gap human teams cannot handle. While AI introduces new risks, it also provides the strongest defense—making “safety by design” and large-scale deployment essential for protecting vulnerable populations.

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How Aave V4’s "Design Choice" Turned Into a $195M Liquidation Deadlock (KelpDAO/rsETH Case)
DEV Community • 2026-04-21 09:00

How Aave V4’s "Design Choice" Turned Into a $195M Liquidation Deadlock (KelpDAO/rsETH Case)

Intro Two months ago, while auditing Aave V4, I discovered a critical DoS vector in their core math library. I reported it, expecting a fix. The response? "This is intended design. Not a bug." Fast forward to April 2026: The KelpDAO/rsETH exploit happens. Lazarus Group dumps massive amounts of rsETH into Aave as collateral. When the price crashes, liquidators try to step in, but the protocol hi...

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A New York Times Investigation Named Its Satoshi
HackerNoon • 2026-04-21 09:00

A New York Times Investigation Named Its Satoshi

A New York Times investigation by John Carreyrou identified Adam Back as Satoshi Nakamoto, but just 11 days later, the documentary Finding Satoshi presents a competing conclusion. Built on four years of research, expert interviews, and behavioral analysis, the film reframes Bitcoin’s origins through the lens of cypherpunk ideology rather than a single individual.

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DEV Community • 2026-04-21 09:00

CQRS in Go — Part 2: side-effect-free command handlers

CQRS in Go series: Part 1: the aggregate, Transition() and Clone() Part 2: command handlers without side effects Part 3: sagas and event choreography Part 4: PostgreSQL as an event store If you followed Part 1, you know what an aggregate is and how Transition() reconstructs state from events. Now, a more concrete question: who decides to emit those events? Who validates that a comma...

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Product Hunt — The best new products, every day • 2026-04-21 08:55

ChatFolders

Folders for your AI chats with ChatGPT Claude, Gemini & Grok Discussion | Link

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DEV Community • 2026-04-21 08:53

Understanding Merkle Trees: a Rust Implementation with Blockchain Examples

You have probably seen Merkle trees mentioned in blockchain or distributed systems contexts. But most explanations are frustratingly generic: they never really show how Merkle trees work or why they are needed in the first place. I decided to dig a bit deeper and as a result I built a simple implementation of a Merkle tree in Rust with some examples (including the Simple Payment Verification as i...

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The Same Week AI Hit $1 Trillion, a CEO's Home Was Firebombed — Mapping the Structural Asymmetry of the AI Era
DEV Community • 2026-04-21 08:52

The Same Week AI Hit $1 Trillion, a CEO's Home Was Firebombed — Mapping the Structural Asymmetry of the AI Era

What happened In April 2026, AI company valuations crossed the trillion-dollar mark. The same week, a Molotov cocktail was thrown at a CEO's home. A separate company laid off 1,000 people. This is not coincidence. These events share the same structural root. I wrote an open-source book to map that structure — not with opinions, but with primary data. Why a developer wrote th...

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DEV Community • 2026-04-21 08:51

The Brutal Truth About 37 Dev.to Posts: What My "Second Brain" Project Taught Me About Failure

The Brutal Truth About 37 Dev.to Posts: What My "Second Brain" Project Taught Me About Failure Honestly, I never thought I'd be writing my 37th article about the same project. Here I am, sitting at 1,847 hours invested, 2,847 articles saved, and only 84 actually read. A 2.9% efficiency rate that makes my accountant weep. Yet here I am, sharing another failure story because... well, appa...

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DEV Community • 2026-04-21 08:51

منصة API لتطوير إنترنت الأشياء

خلاصة القول (TL;DR) تمتلك واجهات برمجة تطبيقات إنترنت الأشياء (IoT APIs) خصائص تكسر افتراضات أدوات واجهة برمجة التطبيقات القياسية: نطاق ترددي مقيد، وحمولات بيانات ثنائية، وأنماط مصادقة الأجهزة، وبروتوكولات ليست HTTP على الإطلاق. تتناول هذه المقالة ما يحتاجه مطورو إنترنت الأشياء من أدوات واجهة برمجة التطبيقات، وأين تتناسب الأدوات القياسية مثل Apidog، وأين تقصر (MQTT هو المثال الصادق)، وك...

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DEV Community • 2026-04-21 08:49

We built it during the NVIDIA DGX Spark Full-Stack AI Hackathon — and it ended up winning 1st place overall 🏆

Agent tooling is getting powerful. But something interesting happens when you start running many agents at the same time: the bottleneck shifts from intelligence → coordination. Over the past year, I’ve been working heavily with systems like OpenClaw, Hermes Agent, and Claude Code to automate different parts of my workflow. As the number of agents increased, the real problem became clear: man...

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DEV Community • 2026-04-21 08:48

Project, Don't Embed: Introducing Virtual Frame

A first-time introduction to Virtual Frame — what it is, why it exists, and how it composes independently deployed web apps into a single page without a shared build. There's a problem every large frontend eventually runs into, and it goes something like this: you have five teams, five stacks, five deployment pipelines — and one page. The design system lives in team A's repo. The checkout widget ...

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