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ProgrammingDEV Community ·

How to Use Your Phone as a Second Screen for Your Laptop in 2026

A second monitor can completely change how you work on a laptop, but buying one isn't cheap, and carrying one around is a pain. Here's the good news: the phone in your pocket can become a wireless second screen for your laptop in about ten minutes, with a free app and no extra hardware. In this guide, you'll learn exactly how to use your phone as a second screen for your laptop in 2026, on both Android and iPhone. Modern phones have sharp, bright displays that are often better than cheap portable monitors. Used as an extended display, your phone is perfect for holding a chat window, a to-do li

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ProgrammingDEV Community ·

Monitoring AI coding agent costs and activity on your own machine

I run Claude Code, Cursor, Codex and a handful of sub-agents on my own machines every day. For a long time, I knew what they cost but had little visibility into their work. If an agent felt slow or got stuck, I had to dig through separate logs to understand why. That became harder as I started using several agents on the same project. Each kept its own session history, and there was no single place to review the activity.

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ProgrammingDEV Community ·

Autoscaling doesn't save you at 30,000 requests per second — your dependencies do

There's a comfortable story about peak traffic: load goes up, the autoscaler notices, pods multiply, everyone keeps their evening. I've watched that story hold, and I've watched it fail in a specific and instructive way — the autoscaler worked perfectly and the platform degraded anyway. Running transaction paths at sustained peaks in the tens of thousands of requests per second teaches you that horizontal scaling is the easy half of the problem. The hard half is that everything your new pods talk to did not scale, and now there are more of them asking. Scale-up triggers.

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ProgrammingDEV Community ·

What If an AI Could Answer a Legal Question Based on the Law That Existed At That Time?

What If an AI Could Answer a Legal Question Based on the Law That Existed At That Time? I've been working on a research project called Indian Constitution Temporal QA, and it started with a question that sounds simple: Can an AI answer a question about the Indian Constitution while taking the date of the question into account? Most question-answering systems treat a document as if it is static. Legal documents aren't. The Indian Constitution has been amended repeatedly.

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ProgrammingDEV Community ·

A cache key ate 99.9% of my records and the pipeline looked green

The worst pipeline bug I've shipped didn't throw. No stack trace, no failed job, no alert. Every run went green, finished inside its window, and wrote roughly one record out of every thousand it was handed. The job's own metrics said it was healthy, because the job's own metrics counted runs, not rows. It took a business user asking why a campaign list looked short to surface it.

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ProgrammingDEV Community ·

My First Open-Source Contribution

I’m excited to share that I’ve made my first contribution to freeCodeCamp! 🎉 My contribution was to the Python v9 curriculum, specifically the Kitchen Inventory Tracker workshop. I worked on Issue #70475, which pointed out incorrect Python terminology in Step 2 of the workshop. The instructions referred to check_kitchen_stock() as a function name and said that Python would “throw a syntax error.” While these may seem like small wording issues, they matter in an educational project where thousands of learners rely on the documentation to build the right mental models. I submitted PR #70539, wh

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ProgrammingDEV Community ·

Day 3 of Building Crowdwide: Teaching Users a Feature Is Surprisingly Hard

It has been 3 days since I launched Crowdwide, and even though the platform is still very small, I’ve already learned something I didn't really expect: Building a feature is sometimes easier than getting users to actually use it. Here are the current numbers: 6 members 13 posts shared 3 communities These numbers are obviously tiny compared to established platforms, but for me, these first users are valuable because I can actually observe how people interact with something I built. And that's where I noticed this problem. Before Crowdwide, I built Rizzzler, a link-in-bio platform. You can creat

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ProgrammingDEV Community ·

The boring part of an AI agent is the part that works

Most of the time an incident spends "being worked on" isn't work. It's waiting to reach someone who can act on it. An alert fires, an email lands in a shared inbox, somebody skims it, guesses which team owns it, forwards it, and that team decides it isn't theirs. On a bad night that loop costs you an hour before anyone has opened a terminal. I built an agent to collapse that loop for a BSS platform, and it took mean time to resolution on routed incidents from around two hours to about ten minutes.

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ProgrammingDEV Community ·

The Framework Nobody Wrote Down: Taking a Backbone App to React

Backbone gave you models, views, a router and events, and left the rest to you. So most Backbone apps carry a homegrown framework on top: a global singleton, an event bus, a navigation controller, view cleanup code, a template build step and a drawer of jQuery plugins. Moving to React is mostly about finding that framework and deciding what replaces it. This guide covers how to run Backbone and React side by side, let React read Backbone models, turn views into components, test an app that never had tests, and delete the code that only existed to keep Backbone tidy. Backbone never tried to be

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ProgrammingDEV Community ·

How I Added a Pre-Filled WhatsApp Button to Every Client Website in Delhi - With Code

How to Add a Pre-Filled WhatsApp Button to a Website with HTML, JavaScript & React If you build websites for businesses in India, you've probably noticed something: Many customers would rather send a WhatsApp message than fill out a contact form. For local businesses, especially service-based businesses, WhatsApp can be a much more natural conversion channel than asking someone to fill in their name, email address, phone number, and a long enquiry form. When I build websites for clients in Delhi and across India, one simple feature I often add is a WhatsApp click-to-chat button with a pre-fill

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ProgrammingDEV Community ·

How to Sync Billing Data to Supabase (Stripe, QuickBooks, Xero & Paddle)

Sync Stripe, QuickBooks, Xero or Paddle into Supabase Postgres in about 5 minutes. Auto-created tables, scheduled syncs, and the RLS step most guides skip. By Ilshaad Kheerdali · 5 October 2026 Supabase is where a lot of small SaaS teams keep their application database, so it is the obvious place to put billing data too. One database, one SQL console, and your Stripe invoices sitting next to your own users table so you can join them. Getting the data there is the part people underestimate.

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ProgrammingDEV Community ·

What you can (and can't) scrape from LinkedIn without logging in — a head-to-head test of 45 runs

Most "no cookies" LinkedIn scrapers on the market return data that a logged-out visitor never sees: exact connection counts, every past job, people search with "15,666 results". That data has to come from somewhere — usually logged-in accounts on the seller's side. Sometimes that's fine for you. Sometimes it's a compliance problem you only discover later. I wanted a clear answer to a narrower question: how far can you get using only what LinkedIn shows to a logged-out visitor?

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ProgrammingDEV Community ·

💀 I Hunted Down the Silent Killers in ATLOCK v5 (And Why Your Python App is Probably Failing in Silence) 🔥

💀 I Hunted Down the Silent Killers in ATLOCK v5 (And Why Your Python App is Probably Failing in Silence) 🔥 "The devil isn't in the missing comma. The devil is in the background thread that silently fails to lock the vault when Windows goes to sleep." We are at 984 downloads across all Akhouri Systems products. Just 16 more until we hit the 1,000 milestone. ATLOCK v5 is 100% built, battle-tested, and ready to ship. But before we drop the hammer and release it to the wild, I need to talk about the monsters I had to slay in the codebase.

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