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Hacker News · Technology

Show HN: I made a calculator that works over disjoint sets of intervals

I've been studying interval arithmetic for the past few weeks and it's a really interesting field because while there is a ton of super interesting research published over the past decades, it has never really gotten the recognition that it deserves, IMO.One reason for this is that standard interva...

fouronnes3 11 hours ago

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Hacker News · Technology

Casus Belli Engineering

Article URL: https://marcosmagueta.com/blog/casus-belli-engineering/ Comments URL: https://news.ycombinator.com/item?id=47812331 Points: 4 # Comments: 0

b-man 11 hours ago

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DEV Community · Technology

Incident Report: Service failure due to storage full

Yesterday, my homelab server suddenly became unresponsive. It started with a flurry of Discord notifications, the universal signal that something has gone seriously wrong. I found all services offline. The logs pointed to a primary culprit: a Redis failure, specifically a Server Out of Memory error...

Jancer Lima 11 hours ago

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DEV Community · Technology

QA Engineers Have an Unfair Advantage in Machine Learning

Most ML models don’t fail because of bad algorithms. They fail because no one properly evaluates them. That’s where a QA mindset changes everything. ⸻ Think Like a Tester, Not Just a Builder In ML: Training = writing code Validation = testing & tuning Test set = final regression 👉 Sound...

Hemalatha Nambiradje 11 hours ago

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DEV Community · Technology

⏱ Remote Timer — an easy way to keep time under control

I recently created Remote Timer because I needed a simple tool to run Scrum events with my team. I hope it’s useful for you too! But Remote Timer is much more than just a sprint timer — it’s perfect for presentations, meetings, speeches, debates, Zoom calls, and any situation where keeping everyone...

Pro Project Managment 12 hours ago

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DEV Community · Technology

From Weekend Hackathon to AWS Global Finalist: Building an AI Tutor That Actually Works Offline

Six months ago, I was debugging a React component at 2 AM when my little sister called from our village outside Addis Ababa. She was struggling with her physics homework and couldn't afford extra tutoring. That moment sparked an idea that would eventually land me as a finalist in AWS AIdeas 2025....

Natnael Getenew 12 hours ago

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DEV Community · Technology

A 300-Line GitHub Actions Security Linter: Five Rules That Catch the CVE Patterns

A 300-Line GitHub Actions Security Linter: Five Rules That Catch the CVE Patterns A focused TypeScript CLI that finds the five .github/workflows/*.yml anti-patterns that account for most real-world Actions compromises — and only those. SARIF 2.1.0 output for GitHub code scanning. actio...

SEN LLC 12 hours ago

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DEV Community · Technology

Why I Stopped Logging In to Read Tweets

Someone shares a tweet in a Slack channel. I click. Twitter shows me half the post, then drops a login wall. I close the tab. This happens constantly now. Public content — content that was publicly broadcast, on a public URL — has been quietly converted into gated content. Not by changing what's pu...

James Mitchell 12 hours ago

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DEV Community · Technology

I Built an AI That Texts People Back as Me — and Nobody Noticed

This is a submission for the OpenClaw Challenge. What I Built I built a personal messaging proxy — an OpenClaw agent that monitors my WhatsApp and Telegram, responds to incoming messages on my behalf, and does it so accurately that most people think it’s me. The problem...

Saviour Promise 12 hours ago

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DEV Community · Technology

Vector Databases Explained: A Comparison of Pinecone, Chroma, and Weaviate

Vector Databases Explained: A Comparison of Pinecone, Chroma, and Weaviate A technical deep dive into vector databases, comparing Pinecone, Chroma, and Weaviate, including prerequisites, concepts, and production tips The rise of machine learning and artificial intelligence has led to a...

Rajesh Mishra 12 hours ago

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DEV Community · Technology

Pulse Check: Real-time Arrhythmia Detection with Isolation Forest and InfluxDB

Ever tried to find a needle in a haystack? Now imagine the haystack is moving at 250Hz, and that "needle" is a life-threatening heart arrhythmia. In the world of wearable technology, handling high-frequency ECG/EKG data isn't just a "big data" problem—it's a "fast data" problem. To keep users safe...

Beck_Moulton 12 hours ago

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DEV Community · Technology

How I Built a Personal AI Workspace with OpenClaw and Reframed My Development Workflow

When I first came across OpenClaw, I was not looking for another AI tool. Like most developers, I already had access to several. What caught my attention was the idea of control. OpenClaw did not position itself as just another assistant. It presented something more fundamental: a way to build and o...

Saviour Promise 12 hours ago

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DEV Community · Technology

I Deleted the Button — Migrating Flutter AI Features from UI-Triggered to Hourly Cron Batch

I Deleted the Button — Migrating Flutter AI Features from UI-Triggered to Hourly Cron Batch Introduction I removed the "Run AI Prediction" button from my app. That sounds like a step backward — but it was actually one of the best architectural decisions I made this week. By mo...

kanta13jp1 12 hours ago

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Hacker News · Technology

Generating Hierarchical JSON Representations of Scientific Sentences Using LLMs

Article URL: https://arxiv.org/abs/2603.23532 Comments URL: https://news.ycombinator.com/item?id=47811993 Points: 3 # Comments: 0

PaulHoule 12 hours ago

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DEV Community · Technology

Building an AI Tutor for 40 Million Ethiopian Students Who Learn in Amharic

When I tell people that 40 million Ethiopian students don't have access to quality tutoring, they're shocked. When I explain that most of them learn in Amharic—not English—the tech community suddenly goes quiet. This is the reality I've been wrestling with as a developer in Addis Ababa. Ethiopia ha...

Natnael Getenew 12 hours ago

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DEV Community · Technology

Standardizing "Intelligence": The 3-Layer Metadata Philosophy

In our previous posts, we’ve discussed why AI Agents fail when they rely on "vibes" and why they need a "Cognitive Interface." But what does "Intelligence" actually look like at the code level? If you ask ten developers how to describe a tool to an AI, you’ll get ten different answers. Some will f...

tercel 12 hours ago

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DEV Community · Technology

The One Mindset Shift That Separates People Who Use AI From People Who Get Left Behind

You take out the garbage every day. You've done it for years. Maybe decades. It's just a thing you do. Part of the routine. You grab the bag, walk outside, toss it in the bin. Done. Never think about it twice. But what if you stopped for 10 seconds and asked: "Does it have to be this way?" What i...

Serhii Panchyshyn 12 hours ago

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DEV Community · Technology

Why I built a lossless alternative to AI memory summarization

Why I built a lossless alternative to AI memory summarization Every AI memory tool I tried summarized my sessions before giving them back to me. I'd spend an hour debugging a gnarly webhook bug with Claude Code. A week later I'd come back, ask about it, and get a three-sentence LLM summary. The ac...

Nate Nelson 12 hours ago

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DEV Community · Technology

I Gave an AI a Body. Here’s What Happened.

A personal reckoning with OpenClaw — the open-source assistant that doesn’t just answer, it acts. I’ve been chasing the “perfect AI assistant” for years. I tried every chatbot. I built custom GPT wrappers. I wired together n8n automations, pasted prompts into Notion, and set up more Zapier flow...

Saviour Promise 12 hours ago

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DEV Community · Technology

#DevChallenge #openclawchallenge

Project development essay Introduction This essay outlines the key details that shaped the development of the project submitted to the OpenClaw Challenge. It combines a concise project summary, the technical and product decisions made during development, and practical notes on how the submission was...

Dan 13 hours ago

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DEV Community · Technology

The Missing Piece Every Obsidian User Needs: Local RAG That Actually Works in 2026

Everyone has a vault full of beautiful corpses. Notes you wrote at 2am, PDFs you highlighted, project logs, character sheets, half-finished essays. Then you install an AI plugin and it gives you glorified Ctrl-F with a chatbot face. That is not RAG. That is autocomplete wearing a trench coat. The m...

v. Splicer 13 hours ago

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DEV Community · Technology

How I Used AI ~MultiAgent~ Simulation to Fix My Ad Messaging

From Guessing to Knowing: How I Used AI Agent Simulation to Fix My Ad Messaging A UX researcher's experiment in synthetic audience intelligence — and what it taught me about my own product. The Honest Problem I had ads. Good ads, I thought. They were clean. They hit the fe...

Luis Vargas 13 hours ago

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The Guardian · World

Family of US man who died after officer shoved knee into back sues police

Charles Adair relatives urge video to be made public after Kansas officer charged with second-degree murderRelatives of a man whom investigators determined died after a Kansas sheriff’s deputy shoved his knee into the cuffed man’s back for a minute and 26 seconds have filed a federal lawsuit.Attorne...

Associated Press 13 hours ago

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DEV Community · Technology

We raised $6.5M to kill vector databases... and it's been exactly 4 weeks. Here's what's actually happening.

Four weeks in. Here's what we shipped for devs: 5 lines from install to production retrieval: from hydra import Hydra h = Hydra(api_key=...) h.ingest(docs) # vector + graph, auto h.retrieve(query) # tuned, not stitched No embedding pipeline to maintain. No Neo4j schema to babysi...

Harnoor Singh 13 hours ago

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