DEV Community • 2026-07-27 03:37

How I Reduced My OPEX By 99.5% Using Go

Previously, I wrote about How I Processed 666K Pages Of Flattened PDFs into a Full Text Search Engine called the Apario writer. Upon on the conclusion of the last segment, I was able to optimize the compilation time of the original collection of data by rewriting the sidekiq Ruby pipeline script into a dedicated Go Application. Regardless of what compiling the PDF assets would look like, I still n...

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36m read
DEV Community • 2026-07-27 03:37

Why Your AI Agent Drowns in 50,000 Tokens of Tool Definitions

Why Your AI Agent Drowns in 50,000 Tokens of Tool Definitions Every time you connect an MCP server to your AI agent, you're adding thousands of tokens of tool definitions to your context window. Connect 10 servers? That's 50,000 tokens of tool schemas before you've even asked a question. Your agent is drowning in tools it doesn't need. The Problem Traditional MCP integratio...

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1m read
DEV Community • 2026-07-27 03:36

The Payment Succeeded. The Governance Failed: Observing AI Agent Boundary Violations with OpenTelemetry and SigNoz

AI agents are increasingly being trusted with actions that affect money, permissions, customer data, and operational systems. But there is a dangerous assumption hidden inside many agent workflows: If the action completed successfully, the agent behaved correctly. That is not always true. A payment can succeed technically while violating an approval policy. An API call can return 200 OK while ...

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7m read
DEV Community • 2026-07-27 03:20

Cherry-picking your hotfix twice is the real pipeline smell

We had a gitflow pipeline that looked clean on paper: develop feeds a release branch, the same build artifact promotes through dev, qa, sit, uat, and prod, and once prod is green we tag the commit on main. Textbook. Then a production bug showed up on a Tuesday afternoon, and the diagram stopped mattering. The standard gitflow answer is to branch a hotfix off the tag, PR it back into release, run ...

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4m read
Spark Performance Deep Dive on Databricks: Shuffle Tuning, Skew Handling, and Z-Ordering with Delta Lake + Unity Catalog
DEV Community • 2026-07-27 03:14

Spark Performance Deep Dive on Databricks: Shuffle Tuning, Skew Handling, and Z-Ordering with Delta Lake + Unity Catalog

The problem with "just add more workers" Most Spark performance issues on Databricks aren't solved by scaling the cluster — they're caused by shuffle and skew, and no amount of extra nodes fixes a badly partitioned join. This post builds a realistic pipeline (order events joined against a small dimension table, aggregated, and written to Delta Lake) from the ground up, and uses it to wo...

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5m read
DEV Community • 2026-07-27 03:12

Six months of running a GBA emulator

I shipped GoGBA (Android + iOS) to both stores in late December 2025. Six months in: MAU peaked at 8.3k, currently steady around 7.4k. No paid advertising, ever. This is a write-up of what the six months actually involved. I'll be specific about the technical work, and equally specific about the mistake that cost me RetroAchievements hardcore certification — because that part is the most useful t...

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9m read
DEV Community • 2026-07-27 03:08

Title: How to Automate A4 Batch ID Card Printing in React (Without a Backend)

The Nightmare of HTML-to-PDF in React If you’ve ever built a School ERP, HR portal, or Event Management system, you’ve probably hit this exact wall: Your client needs to print 5,000 ID cards or badges. Usually, this forces frontend teams to do one of two terrible things: Pay for an expensive backend PDF generation API (which raises huge GDPR/privacy concerns because you have to send sensitive em...

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3m read
DEV Community • 2026-07-27 03:05

React useDeepCompareEffect: Fix useEffect Object Dependencies (2026)

React useDeepCompareEffect: Fix useEffect Object Dependencies (2026) You wire up a fetch. The endpoint takes a query object, so you pass it in the dependency array. The effect fires, sets state, the component re-renders, the query object is rebuilt — a brand-new object with identical contents — and the effect fires again. You have written an infinite loop, and React thinks it did exactl...

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10m read
DEV Community • 2026-07-27 03:04

CSS Box model

In CSS, the term "box model" is used when talking about web design and layout.The CSS box model is essentially a box that wraps around every HTML element. Every box consists of four parts: content, padding, borders and margins. EXPLANATION Content - The content of the box, where text and images appear Padding - Clears an area around the content. The padding is transparent Border- A border that...

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1m read
DEV Community • 2026-07-27 03:03

I Built a Software Review Platform with Nearly 2,000 Static Pages Using Next.js 16 — Here's What I Learned

When I started building PilotStack, my goal wasn't to create another software directory. I wanted to answer one simple question: How can you build a content-heavy website that stays fast, scalable, and easy to maintain? A few months later, the project has grown into a production application with almost 2,000 statically generated pages. Here are a few lessons I learned along the way. Why Stati...

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2m read
DEV Community • 2026-07-27 03:02

Mi participación en DEV Education Track: Build Multi-Agent Systems with ADK

Lo que construí Para este proyecto hice un sistema sencillo usando varios agentes de IA que trabajan juntos para resolver una tarea. La idea fue entender cómo cada agente puede tener una función específica en lugar de que uno solo haga todo el trabajo. Mi objetivo fue aprender cómo se comunican entre ellos y cómo dividir un problema en partes más pequeñas para obtener mejores resultados. Tal como ...

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1m read
DEV Community • 2026-07-27 02:52

Your Knowledge Graph Is Wasting 70% of Its Tokens

Everyone building GraphRAG tunes the same three dials: the retriever, the chunk size, the re-ranker. Then the retrieved subgraph gets serialized into the prompt with json.dumps() — and nobody measures what that step costs. I did. It costs more than everything else you tuned. The benchmark I compared 10 graph serialization formats — JSON, GraphML, RDF variants, edge lists, and others —...

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2m read
DEV Community • 2026-07-27 02:51

How to Stop Queued WhatsApp Replies After the 24-Hour Window Expires

A WhatsApp reply can be valid when an agent writes it and invalid when a queue worker finally sends it. Approval queues, retries, outages, and delayed jobs can all push a free-form reply beyond WhatsApp's 24-hour customer service window. Checking the window only in the UI is therefore not enough—the sender needs a server-side guard immediately before transport. This tutorial builds that guard wi...

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7m read
DEV Community • 2026-07-27 02:48

What Actually Happens Between "Export Gerbers" and a Physical PCB Showing Up at Your Door

If you've ever designed a board in KiCad, EasyEDA, or Altium, clicked "Export Gerbers," uploaded a zip file to a fab house, and then a couple weeks later a small padded envelope showed up with actual copper-and-fiberglass boards inside — you've probably wondered, at least once, what happens in between. What does a design file actually turn into on a factory floor, and why does it take days instead...

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5m read
Newest questions tagged javascript - Stack Overflow • 2026-07-27 02:43

How to drag and drop react. How to generate PDF from HTML React

I actually built an engine that calculates the A4 cut-sheet math automatically. Here is a video showing how it works: https://youtu.be/l9aXWqRSFCM?si=nEIaaqsxypmzCflm

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1m read
DEV Community • 2026-07-27 02:39

I built a PDF table checker that verifies arithmetic in any PDF without a template

The problem I kept running into: a financial report where a subtotal on page 8 is wrong, but nobody spots it until the numbers get aggregated into a spreadsheet and something doesn't reconcile. I wanted a tool that could ingest any PDF with tables and tell me which totals don't add up. The constraint: no template, no column mapping UI, no server. Every byte in the browser. What it does ...

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2m read
DEV Community • 2026-07-27 02:38

I built a client-side trade document validator — no upload, no server, just the browser

The problem I kept hitting: an international invoice with a line total that's off by a cent, or an HS code that appears in the commercial invoice but is absent from the packing list. Customs holds are rarely dramatic. They're usually paperwork. I wanted a tool that would catch these before the documents left the company. The constraint I set: nothing uploaded to a server. Every byte stays in the ...

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2m read
DEV Community • 2026-07-27 02:36

I Built a Job Search Agent That Scores 200 Jobs With Local AI -- Zero Cloud, Zero Cost

Job searching is tab hell. You open LinkedIn, Indeed, RemoteOK, Glassdoor. You re-read the same listings. You copy-paste the same cover letter. You pay $30/month for tools that just aggregate feeds and call it "AI-powered." I wanted something better. So I built JobRadar. What It Does JobRadar is a CLI tool that searches 8 job sources concurrently and scores every listing against your...

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3m read
DEV Community • 2026-07-27 02:35

The Distribution Gap Killing Early-Stage AI Startups.

Why shipping faster isn’t enough when nobody discovers your product. Every week, dozens of AI startups launch on Product Hunt, Hacker News, Reddit and X. Most disappear within days. Not because the product is bad. Not because the founders aren't talented. They disappear because they confuse launching with distribution. Building has become dramatically easier in the AI era. Getting noticed ha...

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3m read
Hacker News: Front Page • 2026-07-27 02:33

The old-school way of keeping the summer heat out of your home

Article URL: https://monocle.com/design/architecture/keeping-your-home-cool-without-air-conditioning/ Comments URL: https://news.ycombinator.com/item?id=49064588 Points: 12 # Comments: 13

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