Constraints that make developers faster
Ryan chats with Julien Verlaguet, CEO at Skip Labs, about finding the balance between human tolerance and tooling constraints, the spectrum of typed programming languages, and building cost-effective...
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21m ago
OpenAI Alerts More Than 100 Groups About Rogue AI Agent Activity
An anonymous reader quotes a report from Reuters: OpenAI has informed more than 100 organizations about incidents involving unauthorized activity tied to its AI agents, according to a blog post by the...
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Union-Find: The Matrix of Disjoint Sets
The Quest Begins (The "Why") I still remember the first time I stared at a LeetCode problem that asked me to count how many separate groups of friends existed in a social network. My initial instinc...
35m ago
Database Isolation: Why Two Committed Transfers Can Create Money
Two wallet transfers can both commit successfully while creating money. In Lab 08, the problem is a specific query pattern: read a balance, validate it in Go, calculate a replacement value, and write...
36m ago
A practical growth loop for early products
Early growth gets clearer when treated as a learning loop, not a channel checklist. Start with one painful use case and a narrow audience. Then run small experiments that produce real conversations: a...
36m ago
What goes in an approval request: a short reason or a link to the trace?
A reader left a comment on the approval queue post: should the request carry a short justification inline, or just link to the trace? Short answer: both, but they do different jobs, and they should ne...
37m ago
Why Vector RAG Answers Only Half of a Legal Question: Building a GraphRAG Agent That Follows the Law's Cross-References, in 5 Steps
TL;DR Statutes don't repeat themselves, they point: the penalty for violating Section 26 sits sixty sections away and shares no vocabulary with it, so vector search finds half the answer. This post bu...
37m ago
ACH Return Codes Explained: R01 to R85 and How to Handle Them in Production
ACH Return Codes Explained: R01 to R85 and How to Handle Them in Production When you initiate an ACH transfer, you're not guaranteed settlement. The National Automated Clearing House Association (Nach...
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100+ Useful Payloads for Web Security Testing
Author: Trix Cyrus Waymap Pentesting Tool: Click Here Click Here Click Here Web applications constantly process user-controlled input. When that input is handled incorrectly, it can lead to vulnerabil...
38m ago
What Really Happens When You Place an Order on Amazon?
You open Amazon, search for a product, compare a few options, add one to your cart, choose your delivery address, select a payment method, and finally click Place Order. A few seconds later, you see t...
38m ago
Build a Todoist-Alternative with 500 Lines of Vanilla JavaScript
Build a Todoist-Alternative with 500 Lines of Vanilla JavaScript Most people reach for Todoist, Notion, or Apple Reminders to manage their tasks. But what if you could build your own — a clean, fast...
39m ago
My Journey Into Open Source 🚀
My First Step into Open Source 🚀 Hi everyone! 👋 I'm Ramya, a 3rd-year engineering student currently learning Python, DSA, web development, and AI. I recently joined the DEV Community and I'm excit...
40m ago
Our Payslips Were Locked With Each Employee's Date of Birth
When we stopped printing payslips in 2021, the payroll team chose the simplest protection available. Each payslip went out as a PDF attached to an email, locked with a password, and the password was t...
40m ago
Same score, 23 places apart: the normalization maths behind a hackathon judging platform
Two projects in the official DOGFOOD data set both had a raw average score of 3.44, from three judges each. After I normalized the scores, one finished #37. The other finished #14. Same number. 23 pla...
1h ago
I Built a Cross-Client Memory Hub for AI Agents — Here's What I Learned
I use Claude Code for coding, Cursor for refactoring, and Windsurf for exploration. Each has its own memory. Switch tools and my AI forgets everything. So I built MemTether — a local-first memory hub...
1h ago
I built a zero-dependency CLI to pause deploys when L2 gas spikes
The problem Your CI pipeline deploys to Base mainnet at 11 PM. Gas is 10x normal. You burn $200 in fees. Nobody noticed until the gas bill arrived. This actually happened during Base's gas spike in...
1h ago
I built a native macOS menu bar companion for Portless
Portless replaces port numbers with named URLs for local development. I built PortlessBar to make those apps and the proxy controls accessible from the macOS menu bar. What it does...
1h ago
What Click2Shell Teaches About Reporting a Parser Discrepancy
What Click2Shell Teaches About Reporting a Parser Discrepancy Most RCE disclosures lead with the code execution. The Click2Shell report, published September 21, 2026, is interesting for a different...
1h ago
Hunting Memory Leaks in JavaScript: Notes on V8 Mechanics & Chrome DevTools
JavaScript developers rarely have to think about manual memory management. Under the hood, the engine's Garbage Collector (GC) cleans up after us. However, automatic memory management is not foolproof...
1h ago
I told a friend a number was not in her document. It was on page 6, sideways.
This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend everypage is a small tool that answers questions about a PDF using a model that runs on your own machine. It names the...
1h ago
Day 2: How Machines Actually Learn — Supervised, Unsupervised and Reinforcement Learning
Yesterday we saw that machine learning flips traditional programming: instead of writing explicit rules, we give an algorithm data and outcomes and let it discover the rules itself. But how does that...
1h ago
JavaScript Loops: why we use them - the first 3 types
while learning javascript I came across loops but before learning different types of loops, I want understand one question - why do we use loops? Why do we use loops? Loops allow us to repeat a block...
1h ago
Building a Private PDF-to-JPG Converter with Next.js and PDF.js
I built Free PDF to JPG Tool to make converting PDF pages into images easier, without requiring registration, installing software or uploading documents to a server. The goal was simple: choose a PDF,...
1h ago
aswap: multi-account switching for the Antigravity CLI, with failover when quota runs out
I use the Antigravity CLI (agy) with more than one Google account. Switching meant signing out and back in, and when an account ran out of quota in the middle of a long task, the task just stopped. cl...
1h ago
Decision Models Belong on the Agent Hot Path: What Cloudflare Clef Changes
Cloudflare released Clef and Clef-flash on October 1, 2026, and the useful part is not that another model family exists. The useful part is that these models are designed for a narrow job that large l...
1h ago
Your Code Isn't Done When It Works
Your Code Isn't Done When It Works One of the biggest lessons I've learned as a developer is this: Getting an application to work is only the beginning. During development, we usually focus on one q...
2h ago
Critical FortiMail Zero-Day Flaw Exploited in Attacks Allows Unauthenticated Arbitrary File Writes
The U.S. Cybersecurity and Infrastructure Security Agency (CISA), on Thursday, added a critical security flaw impacting Fortinet FortiMail to its Known Exploited Vulnerabilities (KEV) catalog, followi...
2h ago
The Complete Picture: Azure Container Apps + Dapr Reference Architecture for .NET
What does the finished stack buy for its floor, and which seam between its layers breaks first? Priced in West Europe, the layers in front of the code cost about $1,730 a month before the first contai...
2h ago
Six provenance classes, and why your calculation tool needs them
Here is a bug report you will never receive, because nobody can see it: The cable schedule says 120 mm². It was 95 mm² last quarter. Nothing in the project changed. Nobody knows which input moved. Eng...
2h ago
Tripwire: a guardrails layer for LLM apps, built for a friend
This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend my first version of tripwire caught 36% of the attacks i had written for it. on attacks i wrote afterwards, without tou...
2h ago
把一段 10 秒的同步循环改成协程之后，究竟发生了什么？
TL;DR：改协程不是“让代码变快”，而是把 N 次“等待”叠成一坨。顺序执行的 30 次请求要 10 秒，协程版能在 1 秒左右结束——省下来的是等待，不是计算。但改完之后你必须补上四件事：超时、限流、异常语义、以及“哪一步其实还是串行的”。 上一篇我们把“协程是什么”讲成了人话：一个能中途暂停、把线程让出去、之后从原地继续的函数。这篇不看定义，看一段真实的烂代码改成协程之后，时间线到底怎么变了...
2h ago
手写一个 60 行事件循环：async/await 到底在"等"什么？
第一次写 asyncio 的人，通常会被同一个现象绊一下： async def hello(): print("hello") hello() # 什么也没打印 调用了，没有输出，也没有报错——只是静静地返回了一个 。再加上 RuntimeWarning: coroutine 'hello' was never awaited。 这篇不解释概念，直接把事件循环写出来。...
2h ago
协程到底是什么？把它当成“一个能中途暂停的函数”，一切就通了
TL;DR：协程不是“更快的线程”，它是一个可以在中途停下来、把线程让给别人、之后还能从停下的那一行接着跑的函数。它省掉的不是计算时间，而是等 IO 时的空转。 面试被问“协程是什么”，大多数人的答案是背来的一句：“协程是用户态的轻量级线程。” 这句话不算错，但它几乎解释不了任何事。听完你还是不知道该在什么时候用它、为什么它会被一个 time.sleep() 卡死、为什么它不需要锁。 这篇不讲定义...
2h ago
协程到底是什么？用"一个人守三口锅"讲明白，别再和线程混为一谈
面试里被问"协程是什么"，很多人的答案是一句背来的话："协程是用户态的轻量级线程。" 这句话不算错，但它几乎解释不了任何事。听完之后你还是不知道该在什么时候用它、为什么它会被一个 time.sleep() 卡死、为什么它不需要锁。 这篇不讲定义，只讲三件事：协程在切什么、调度权在谁手里、什么时候不该用。 这三个东西经常被并列着讲，但它们回答的其实是同一个问题："谁来决定现在跑哪段代码？" 进程：操...
2h ago
An alternate-key lookup still needs object authorization
Most BOLA writeups show GET /orders/{id} with a guessed UUID. The same bug often hides behind a “friendlier” lookup: GET /orders?email=, findByExternalId, or where slug = ?. If the handler resolves a...
2h ago
ScienceQuizPro Hub — Interactive Science Learning & Quiz Platform 🚀
This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend ScienceQuizPro Hub is an educational science quiz project designed to help students learn science through interactive m...
2h ago
Building a GitHub-Backed Knowledge Portfolio: Lessons from MyZubster, Zorgax, and an Open Source Documentation Proposal
Building a GitHub-Backed Knowledge Portfolio: Lessons from MyZubster, Zorgax, and an Open Source Documentation Proposal How do you turn development activity into a public knowledge portfolio without...
2h ago
Building a Data Pipeline for Vehicle Listings: The Parts That Get Complicated
A vehicle listing looks simple from the front end. You might have a make, model, year, mileage, price and a few images. But behind that interface, keeping the data accurate can become a surprisingly d...
2h ago
How I Built a 24/7 AI DevOps Coding Agent for About CAD 200
Hermes + Claude Code + Telegram on a cheap always-on thin client. I'm a DevOps engineer, and a surprising amount of my time goes into work that is important but repetitive. A server needs patching. A...
2h ago
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Meta's Muse is fantastic for web scraping
Article URL: https://sigh.dev/posts/metas-muse-is-fantastic-for-web-scraping/ Comments URL: https://news.ycombinator.com/item?id=49929970 Points: 8 # Comments: 0
3h ago
If someone might want it different, it should not be a literal
Development covered 2 Aug 2026 to 6 Aug 2026 (commit dates). The rule this project has settled on is one question. Could somebody reasonably want this value different, without a code change? If yes, i...