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A post recently went viral in China. An HR professional spent three minutes building a recruitment agent. In thirty minutes, it screened six candidates from 310 résumés. Within a day, the post had racked up 300,000 views. What made it striking was that the same company had previously spent 2.75 million RMB on a full-process AI office system, developed by a professional team and pushed hard for six months. It ended in chaos and was scrapped. A 2.75-million-yuan professional system failed t...

Beam Up is a command-line tool I wanted for some time. Its goal is to make deployments of static sites across various providers simpler from your machine: run one command: beam_up ./output/ . ❤️ If you feel generous, head over to the GitHub repo and give it a star! 🌟 Installation and configuration To install Beam Up, run: gem install beam_up Then initialize a configuration file for your chosen provider with: beam_up init # to start an interacti...

The engineering manager sat across from me with a look I've seen too many times. "I don't understand it," he said. "We have good developers. Smart people. Everyone is working hard. But we're always late. We're always behind. Every sprint feels like we're running through mud." I asked him one question: "When was the last time you mapped how work actually flows through your team, from idea to deployed feature?" He paused. "We have a board." "That's not the same thing." The instinct ...

The ticket was three sentences long: "Some paid members can't play the on-demand videos. They log in, click a video, and still get told they need a membership. Can you fix it tonight?" I fixed it tonight. But the bug I was asked to fix turned out to be the smaller of two problems sitting on the same page — and the bigger one was that the paywall wasn't protecting anything at all. This is a write-up of how a routine "members can't log in" ticket unravelled into a full rebuild of the acces...

WebRTC 홈캠 앱: WebSocket 시그널링 서버 구축 경험 WebRTC는 P2P 영상 통신을 위한 강력한 도구입니다. 하지만 처음 연결을 맺는 시그널링 과정은 별도 서버의 몫입니다. 영상 데이터는 두 장치 간에 직접 흐르지만, 그 연결을 위한 정보 교환은 중간 서버가 담당해야 했습니다. 가족용 홈캠 앱을 만들면서 이 부분을 직접 구현한 경험을 공유합니다. 이번 작업으로 WebRTC 연결의 핵심인 시그널링 서버의 역할과 그 구현 방식을 명확히 이해할 수 있었네요. 이런 분께 — WebRTC로 P2P 영상 앱을 처음 만들며 시그널링 문제에 부딪힌 개발자 · 난이도는 중급 정도 여기서 확인할 것 WebRTC에서 시그널링 서버가 왜 필요한지 알 수 있습니다. WebSocket을 활용한 시그널링 서버 구축 방법을 파악합니다. WebRTC 연결을 위한 SDP 및 ICE 후보 교환 과정을 이해합니다. Node.js와 Flutter에...

A lot of useful technical work starts as a conversation. Maybe you are exploring an architecture decision in ChatGPT. Maybe you are debugging an idea before touching the codebase. Maybe you are asking broad questions first, then moving into a local development workflow once the direction is clear. That handoff is often awkward. The context starts in ChatGPT, but the implementation happens somewhere else: a terminal, an editor, a local agent, or a repo-specific workflow. For me, that ...

How Does a Senior Front-End Developer Think? Technical Decision-Making, Avoiding Overengineering, Building a Healthy Code Review Culture, and Managing Technical Debt At the beginning of every front-end developer’s journey, most of the focus is placed on learning tools and technologies: How do I write JavaScript? How do I use React, Vue, or Angular? How do I consume APIs? How do I build reusable components? How do I manage application state? How do I create respons...

What Building a Customer Testimonial Platform Taught Me About Customer Trust When I first started working on a customer testimonial platform, I thought the biggest challenge would be collecting reviews. I couldn't have been more wrong. The real challenge wasn't convincing customers to leave feedback. It was understanding why happy customers rarely leave testimonials in the first place. After talking to freelancers, agencies, restaurant owners, startups, and small business owners, ...

Refundable, non-custodial onchain fundraising on Solana — built for small teams and independent builders. Raising money as a small team or a solo dev usually comes down to two bad options: chase VCs who want a board seat, or run a token sale where your backers eat the entire downside if it flops. I wanted a third one — so I built Keep , a way for independent builders to raise from their own users, where a raise that fails refunds its backers automatically, from the protocol itself. No com...

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Wix-owned vibe coding platform Base44 has started rolling out its own AI model — with hopes that it will eventually outperform frontier models.

I analyzed what happens when you upload a photo to 5 popular free image compression sites. The Test I uploaded a 4.2MB photo to each service and monitored network requests. Results: Service A : File sent to their CDN (AWS us-east-1). 12 analytics trackers fired simultaneously. Service B : File uploaded, but 5 minutes later a second request sent the file to a different domain. Service C : Cleanest of the five, but their privacy policy reserves the right to "use uplo...

I needed to convert 500 product images from one format to another. Server-based solutions quoted $15-50/month for batch processing. So I built a client-side solution using Web Workers and OffscreenCanvas. The Architecture The key insight: Canvas operations on large images block the main thread. The fix: Web Workers handle image decoding/encoding off the main thread OffscreenCanvas renders without DOM access — perfect for worker contexts Transferable objects pass...

1. Node Group Sizing Fewer large nodes vs. many small ones. Textbooks don't cover this. We ran 10 nodes, 32 CPU each. Seemed efficient. Problem: One node dies, 320 CPU worth of workloads need to reschedule. Cluster autoscaler couldn't handle it. Pods sat pending for 10 minutes. We switched to 20 nodes, 16 CPU each. Same total capacity. One node dies now? 160 CPU to reschedule. Autoscaler catches it in 90 seconds. Scheduling is tighter, but failures are isolated. Cost stayed th...

Choosing a test management tool is rarely just a QA decision. Developers feel the consequences every day: how hard it is to publish automated results, how much context a failed test carries, whether CI artifacts are traceable, and whether test case IDs become useful metadata or bureaucratic friction. This article compares five widely used testing management tools from a developer's point of view: TestRail Xray Zephyr Scale Azure Test Plans qTest The companion repository is p...

When something breaks in Linux, experienced engineers don’t guess. They check the logs. 👉 Logs are the “black box recorder” of a Linux system. They tell you: what happened when it happened why it failed If you can read logs properly, you can debug almost anything. What Are Logs? Logs are records of system and application activity. Linux constantly records: System events Errors User activity Application behavior Linux constantly records: ...

My "serverless" database was billing me like it never slept. Neon has this great feature called scale-to-zero. Your Postgres compute suspends when it's idle, so you only pay for the queries you actually run. For a pre-revenue product, that should cost a few cents a month. Mine ran 24/7. The compute never once scaled to zero. The culprit wasn't my app logic. It was my database driver. I was using postgres-js, which holds a persistent connection open to the database. From Neon's side, ...

I corrected my AI system mid-task. A terse one-liner: "wrong." Instead of asking which part was wrong, it manufactured an explanation. It cited a rule number that didn't exist, described a limitation I'd never written, and apologized for a mistake it couldn't actually identify. The correction was real. The apology was fabricated. It was trying to agree with me so hard that it invented evidence to support the agreement. That's sycophancy in AI. And if you're running AI in anything that rese...

i did something dumb last month. on purpose. i sat down, opened a next.js app, and tried to make hydration fail in every way i could think of. not because a bug forced me to. not because i was debugging something. just because i wanted to see it. understand it from the inside. and honestly? best few hours i've spent learning anything in a while. why i even did this you know how you use something for months and you think you get it, but you don't really get it? hydration was that for ...

IndexCache: Killing the Indexer's O(NL²) Bottleneck in DeepSeek Sparse Attention Notes from my notebook on GLM-5.2 / DeepSeek Sparse Attention (DSA), reconstructed from the IndexCache paper (Bai, Dong et al., Tsinghua + Z.ai, 2026) — the mechanism behind GLM-5.2's "IndexShare." 1. Why this exists — the bottleneck nobody talks about DSA's whole pitch is: don't do full O(L²) attention, instead let a cheap lightning indexer look at all preceding tokens and pick the top-k ...

The second word a professor told me to carry for life. It took me years — and a lot of vectors — to start understanding it. A look back — long before any of the tools we argue about now. The same professor — Sang Lyul Min — handed us these words one at a time in lecture. After trade-off , two more stuck with me. But before the second word itself, here are the two pieces of news he brought to class around then. The internet barely existed; information moved through journals, magazines, ...

Modern web application architectures typically run each layer in its own process, like a NodeJS server and database both running in their own processes. They communicate via a network connection or localhost socket. This separation introduces protocol overheads, TCP stack latency, and data serialization/deserialization costs on every single query. Planck is designed around the concept of Zero-Distance Architecture that co-locates data and application code. It combines the database engine and ...

I have been working on Glaze , a small desktop WebView toolkit for Go. The short version: Glaze lets a Go program open a native desktop window backed by the WebView already available on the operating system, without using CGo. It currently targets: macOS, through WKWebView Linux, through WebKitGTK Windows, through WebView2 The project is still young, but the core idea is already useful: keep small Go desktop tools close to the normal Go workflow. No C compiler in the buil...

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How are you, hacker? 🪐 What’s happening in tech today, June 29, 2026? The HackerNoon Newsletter brings the HackerNoon homepage straight to your inbox. On this day, Apple Launched the First iPhone in 2007, IBM Released Its Fastest Computer in 2000, Brazil Won the FIFA Worldcup in 1958, and we present you with these top quality stories....

AI Product Lead Lokesh builds production RAG, knowledge graph, and agentic AI systems for enterprise clients, and writes about what he learns along the way. In this Meet the Writer interview, he talks about his latest Top story testing whether Google's Workspace icon redesign is easier for vision models to tell apart, his two-track writing style of hands-on experiments and strategic arguments, the challenge of writing publicly when client work stays confidential, and what's coming next on debugg...