I built a FRAME cartridge for Claude Design Day One
DEV Community • 2026-04-20 13:32

I built a FRAME cartridge for Claude Design Day One

Anthropic launched Claude Design on Friday. By end of Saturday I had a working cartridge that wires it into a structured development workflow. Not because I planned to – but because the architecture made it obvious. That’s the thing I wanted to test: whether FRAME’s engine/cartridge split actually holds when something new drops. New tool, new domain, new workflow. Does the engine stretch to cover...

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6m read
The Hidden Cost of AWS Lambda SnapStart for Python, and How I Fixed It with Durable Functions
DEV Community • 2026-04-20 13:32

The Hidden Cost of AWS Lambda SnapStart for Python, and How I Fixed It with Durable Functions

Recently, I opened our AWS bill and found that thousands of dollars had been charged toward AWS Lambda. I was sure we did not have that much traffic. So I started digging through the bill, and that is when I found the real reason. It was Lambda SnapStart. Lambda SnapStart is a great feature. For latency-sensitive applications, especially APIs, it can reduce cold start duration from seconds to sub...

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5m read
DEV Community • 2026-04-20 13:31

Your Emails Go to Spam Because of Three DNS Records You Never Set Up

As a fractional CTO working with startups in the B4i program, I've seen the same email delivery problem show up over and over. The app was fine. The email content was fine. The issue was usually three DNS records nobody had set up properly. If you've ever deployed something that sends email and then discovered nobody was receiving it, these are the first records to check. A Quick DNS Re...

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5m read
Product Hunt — The best new products, every day • 2026-04-20 13:30

MAXIA Oracle

Multi-source price feed for AI agents Discussion | Link

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1m read
Hacker News: Front Page • 2026-04-20 13:27

U.S. banks may soon collect citizenship data from customers

Article URL: https://www.cnbc.com/2026/04/15/banks-citizenship-data-collection-customer-accounts.html Comments URL: https://news.ycombinator.com/item?id=47834025 Points: 26 # Comments: 1

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1m read
An unexplainable thing I saw: the agent didn't just comply with rules — it endorsed them
DEV Community • 2026-04-20 13:27

An unexplainable thing I saw: the agent didn't just comply with rules — it endorsed them

I asked an agent to generate a video. It wrote itself four internal memos instead. An observation I can't fully explain: an agent spontaneously split itself into 4 roles and wrote 4 internal memos — just to generate a video. It didn't comply with a protocol.It endorsed one. And this only became visible because we had the protocol in place. A language note for English rea...

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33m read
DEV Community • 2026-04-20 13:26

Up down or Down up. Understanding Subqueries and CTEs in SQL: A Comprehensive Guide

Introduction When working with databases, there comes a time when a simple SELECT statement is not enough to answer complex questions. Imagine you need to find customers who spent more than the average spent by all customers, or products that have never been sold, or employees who earn more than their department's average salary. These are the moments when subqueries and Common Table Ex...

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8m read
DEV Community • 2026-04-20 13:23

Best Image Optimizer for Mac

Every developer has been there. You export assets from Figma, drop them into your project, push to production, and Lighthouse hits you with that red score because your hero image is 4.2 MB. The usual fix? Open Photoshop (if you even have it), manually resize, export again, maybe run something through a web-based compressor, and pray you didn't kill the quality. Or set up a build pipeline with Sha...

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3m read
DEV Community • 2026-04-20 13:21

Módusz és medián gyakorisági soroknál

Gyakorisági sorok esetében a módusz, valamint a medián számolása kissé trükkös, de meg lehet érteni a képlet mögötti logikát. Ha esetleg nem lennél tisztában a két fogalommal, a módusz a leggyakoribb (legtöbbször előforduló) érték, a medián pedig a helyzeti középérték. Nézzünk egy adatsort: 1,2,2,3,4,7,10,12 A módusz itt a kettő, hiszen az fordul elő a legtöbbször. A medián a középső érték lenne, ...

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4m read
DEV Community • 2026-04-20 13:21

EcoTwin: An AI Climate Coach for Real-World Emissions Cuts

What I Built EcoTwin is a personalized climate action coach that turns a few everyday inputs, like commute habits, food choices, home energy use, and travel frequency, into a practical action plan with estimated annual CO2e savings. The goal was to build something useful immediately. Instead of giving users a generic sustainability lecture, EcoTwin acts like a climate twin: it estimates a baselin...

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2m read
Building a Blog in TanStack (Part 2 of 2)
Frontend Masters Boost RSS Feed • 2026-04-20 13:18

Building a Blog in TanStack (Part 2 of 2)

A blog is a perfect use case for pre-rendering, so that the static build files can render all on their own. TanStack Start can even help with the server functions via middleware.

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1m read
DEV Community • 2026-04-20 13:16

CSP for Third Party Scripts: The Practical Cheat Sheet for GA, Stripe, Intercom, and More

You ship a Content Security Policy. It works locally. Then marketing adds Google Tag Manager, payments goes live with Stripe, support turns on Intercom, and suddenly the browser console is screaming about violations and half your integrations are dead. This is the number one reason CSP deployments fail in production. Not because the concept is hard, but because every third party service loads scr...

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5m read
DEV Community • 2026-04-20 13:12

We Almost Didn’t Launch — Until We Cut the Product in Half

🚀 We almost didn’t launch. Not because the product was impossible.Not because the team wasn’t capable. Because the scope kept growing… while our capacity didn’t. A year ago, launching soci.lt felt like chasing a horizon:– People had jobs, studies, life– Capacity was unpredictable– “Just one more feature” kept sneaking in– Timeline kept slipping And the worst part?Until launch — nothing moves. ...

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2m read
DEV Community • 2026-04-20 13:11

Open-sourcing my personal AI Agent Harness for Production (harness-loom)

I’ve been poking at a bunch of AI agent frameworks and coding tools this past year. For personal projects, I often just use Hermes Agent or something similar because it's fast and saves tokens. But honestly? When I actually have to ship something for production, I can't just use those raw agent setups. Between security compliance, instability, and the sheer complexity of real-world codebases, it’...

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2m read
Hacker News • 2026-04-20 13:07

Show HN: CyberWriter – a .md editor built on Apple's (barely-used) on-device AI

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1m read
DEV Community • 2026-04-20 13:06

The Dual-Signal Governor: A Control-Plane Pattern for Drift-Aware Systems

Your drift detector fires. The session looks clean. You roll back anyway. That's the false positive problem — and it's not a threshold tuning issue. It's architectural. Embedding-based detectors measure geometric displacement in vector space. They have no model of semantic trajectory, logical flow, or whether a session that drifted away has returned. Once the threshold trips, it stays tripped. T...

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7m read
HackerNoon • 2026-04-20 13:06

How I Built an Offline-First iOS App Without a Backend

A single-user app can run entirely locally. Offline-first design, local storage, and minimal cloud use can simplify architecture and reduce costs

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1m read
Lobsters • 2026-04-20 13:06

Forgejo v15.0 is available

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1m read
Echo JS • 2026-04-20 13:06

Why I don't chain everything in JavaScript anymore

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1m read
DEV Community • 2026-04-20 13:05

Vitest 2.0 vs Jest: We Migrated 400 Tests and Here's What Actually Changed

Vitest 2.0 vs Jest: We migrated a 400-test Jest suite last month. Runtime dropped from 47 seconds to 11 seconds. Here is the honest breakdown. Why Vitest 2.0 Is Worth the Switch Vitest 1.x was already faster than Jest for TypeScript projects because it reuses Vite's transform pipeline instead of running ts-jest or babel-jest. Vitest 2.0 adds: Browser mode — run tests in Chromium/Fir...

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2m read
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