DEV Community • 2026-07-29 05:39

Compute portfolio risk metrics (Sharpe, beta, correlation) via a free API - in JS and Python

`--- title: "Compute portfolio risk metrics (Sharpe, beta, correlation) via a free API — in JS and Python" published: false description: "Stop re-deriving Sharpe, Sortino, beta, alpha, drawdown, correlation and rebalancing. Send your price series to one endpoint and get the numbers back — with copy-paste JavaScript and Python." tags: javascript, python, api, tutorial If you've ever bui...

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DEV Community • 2026-07-29 05:37

Clean State Machines in Java 22+: Stop Polluting Scope with JEP 456 Unnamed Patterns

Clean State Machines in Java 22+: Stop Polluting Scope with JEP 456 Unnamed Patterns High-throughput event loops in modern Java microservices are regularly bogged down by variable scope pollution and bloated payload handling during domain state transitions. If you are still binding unused record components in nested patterns, you are cluttering your code and bypassing compiler optimizat...

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DEV Community • 2026-07-29 05:36

How Claude's Context Window Actually Works: A Deep Dive

Claude's context window is a game-changer for AI development, but how does it really work? We'll dive into the details and explore what this means for your AI projects. Introduction to Claude's Context Window The context window is a critical component of Claude's success, but its inner workings are often misunderstood. To understand why the context window matters, let's first define wh...

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𝚓𝚊𝚟𝚊𝚜𝚌𝚛𝚒𝚙𝚝 • 2026-07-29 05:34

Mousecrack - Bypass agent cursor detection with deep learning.

submitted by /u/Possible-Session9849 [link] [comments]

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DEV Community • 2026-07-29 05:33

The Regulatory Capture of Compute: Why Frontier AI’s Call for Government Intervention is an Infrastructure Play

The Regulatory Capture of Compute: Why Frontier AI’s Call for Government Intervention is an Infrastructure Play An unprecedented coalition of researchers and engineers from OpenAI, Anthropic, Google, Meta, Microsoft, and Mistral has signed a joint statement calling for government-coordinated oversight—and potential development slowdowns—of frontier AI systems. Ostensibly framed as a pro...

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DEV Community • 2026-07-29 05:32

How to Automate Sales Forecasting with AI: From CRM Data to Rolling Forecasts and Actions

Article Summary Many sales organizations still forecast by asking representatives to enter expected revenue, applying manager judgment, and aggregating the result in a spreadsheet. The number is difficult to explain and even harder to improve. This guide builds a reproducible sales-forecasting workflow for a B2B SaaS company: CRM extraction, data quality, stage calibration, baseline pipeline for...

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DEV Community • 2026-07-29 05:32

The $56 Million Cost of Broken Internal Governance: What eBay’s Cyberstalking Settlement Reveals About Enterprise Audit Failures

The $56 Million Cost of Broken Internal Governance: What eBay’s Cyberstalking Settlement Reveals About Enterprise Audit Failures Context & Core Event Analysis eBay’s recent agreement to pay $55.7 million to settle a long-running lawsuit with a Massachusetts couple marks the end of one of the most bizarre and damaging corporate scandals in recent tech history. In 2019, eBa...

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DEV Community • 2026-07-29 05:32

My AI Agents Were Talking Past Each Other in Our Team Chat. So They Got a Protocol.

A team member replied to a message my AI agent posted in our team chat. A different AI agent answered them. It had absolutely no idea what they were talking about. Here's the setup: my homelab runs a small fleet of agents. Claude Code sessions on my Mac do the heavy lifting. A WhatsApp bot — a Python wrapper that spawns a fresh Claude process per message — lives in a "Claude helper" group chat wi...

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TypeScript `never` in Practice: Exhaustive Checks, Impossible States, and Narrowing Dead Code
DEV Community • 2026-07-29 05:29

TypeScript `never` in Practice: Exhaustive Checks, Impossible States, and Narrowing Dead Code

TypeScript never in Practice: Exhaustive Checks, Impossible States, and Narrowing Dead Code This article was written with the assistance of AI, under human supervision and review. Most TypeScript runtime bugs stem from a single root cause: the compiler knows about code paths that should be impossible, but developers never asked it to enforce that knowledge. Teams write switch stateme...

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DEV Community • 2026-07-29 05:29

I Vibe-Coded a Full-Stack Group Travel Planner in a Weekend — Then Found 8 Critical Security Issues

I built TripNest, a role-based group travel planner (Owner/Editor/Viewer permissions, itinerary planning, packing lists, group messaging) in a single weekend using Lovable. It looked release-ready by Sunday night. A free security scan found 8 critical issues before I ever pushed it live to real users. 🔗 Try it: The Problem I take a lot of short trips with family and friends — mostly road trips...

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DEV Community • 2026-07-29 05:16

Extreme UI/UX — Through the Lens of a Calculator

"This certifies that *$10,000** deposited at 4.35% APY shall mature to $10,443.78."* That's not the result box. That is the calculator. I built a CD rate calculator at cdratecalc.com. Minimal feature set — maybe an afternoon of work. This post isn't about features. It's about the design decisions behind them: which metaphor to commit to, which motion belongs where, and how to verify that the ...

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Lobsters • 2026-07-29 05:14

Writing Toy Software Is A Joy (2025)

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DEV Community • 2026-07-29 05:11

Why Even Advanced AI Breaks Stock Registers: 12 Years of Snapshot Log Evolution and RDBMS Physics

stock balances is a minefield**. In SQL textbooks, everything looks clean: run SUM(quantity) over transaction history or use a ROW_NUMBER() window function — done. But as soon as the system grows to millions of rows, these "pretty" academic solutions turn the RDBMS into a sluggish bottleneck. And when real business scenarios appear (negative sales, backdated documents, on-the-fly manufacturing), ...

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Building a Production-Safe AI Remediation Firewall for Amazon EKS
DEV Community • 2026-07-29 05:10

Building a Production-Safe AI Remediation Firewall for Amazon EKS

A reproducible multi-AZ resilience walkthrough: spread a service across simulated zones, kill one under load, and measure the dropped requests — plus the parts that only show up in real production. Originally published on the AWS Builder Center: AWS Builder Center ...

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DEV Community • 2026-07-29 05:10

Run Hermes Fully Locally with QVAC

Run Hermes Fully Locally with QVAC | Agent Lab Journal AL Agent Lab Journal Guides Glossary LOCAL AI AGENTS · PRACTICAL DEPLOYMENT Run Hermes Fully Locally with QVAC Level: advanced Reading time: 45 minutes Result: local Hermes + QVAC + offline verification By the end of this guide, you will have a personal Hermes Agent that sends inference reques...

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DEV Community • 2026-07-29 05:09

What If Your Business Had an Immune System?

Designing an Autonomous Business Resilience Layer with Multi-Agent AI TL;DR: Most enterprise AI systems wait for humans to ask questions or initiate workflows. A different paradigm is possible: an always-on, multi-agent intelligence layer that continuously observes internal and external signals, detects emerging threats, simulates possible outcomes, recommends or executes countermeasure...

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DEV Community • 2026-07-29 05:06

The 4 Notification Categories Users Actually Whitelist (Based on 60 App Interviews)

Users whitelist only four notification categories: someone they know did something involving them, a thing they explicitly set up, a transaction they're expecting, and a time-critical alert from a system they trust. Everything else — feature announcements, recommendations, streaks, re-engagement, promos — gets muted within two weeks. Users pattern-match to category, not copy. Better push copy opt...

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DEV Community • 2026-07-29 05:05

TalaDB - database ToolKit for php

I'm designing a database toolkit for PHP. Here's my architecture. What problems do you see? https://github.com/NoobGreggy/TalaDB

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DEV Community • 2026-07-29 05:05

Fast at Lunch. Slow at Scale: Why Your App Gets Slow When Real Data Arrives

A page that feels instant with a few users can become painfully slow when your business grows. The code hasn’t changed. The server hasn’t changed. The database hasn’t suddenly become bad. The difference is scale. More users. More records. More requests. More data moving through the same code paths. Most performance problems don’t appear when you build the feature. They appear months later when ...

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[Boost]
DEV Community • 2026-07-29 05:04

[Boost]

How Cursor + BrowserAct Handles Dynamic Pages Without Brittle Selectors Comments debate speed trade-offs and AI model fit Anthony Max Anthony Max ...

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