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DEV Community • 2026-04-21 11:53

FastAPI at 1M+ users: the patterns that actually matter

FastAPI is the default Python web framework in 2026 — 38% of Python teams ship on it, up from 29% a year ago. That means a lot of greenfield projects are making the same early mistakes. This post is what I wish I'd known before scaling Savyour (Pakistan's first cashback platform, 1M+ users, 300+ merchant integrations) from 50 RPS to 3,000+ RPS on FastAPI. Everything below is drawn from productio...

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4m read
DEV Community • 2026-04-21 11:53

Tunneling Out of the Air-Gap: Software Data Diodes for Industrial IoT

IT InstaTunnel Team Published by our engineering team SaaS on a Laptop: Monetizing Local AI Models with Token-Gated Tunnels SaaS on a Laptop: Monetizing Local AI Models with Token-Gated Tunnels You don’t need a cloud server to sell API access. Here’s how to wrap your local Python script in a token-gated tunnel that charges users $0.01 per request — before the traffic ever touches your machine. In...

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16m read
DEV Community • 2026-04-21 11:53

Building a Digital Time Machine: The Brutal Reality Check - Part 2

Building a Digital Time Machine: The Brutal Reality Check - Part 2 A Developer's Honest Journey Through AR Hell Honestly, I never thought I'd be sitting here writing the second article about my AR memory app. If you read Part 1, you know the story: ambitious developer builds a "digital time machine" that pins multimedia memories to real-world locations. Spoiler alert: GPS acc...

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7m read
DEV Community • 2026-04-21 11:52

Building High-Performance Native Modules for React Native with Nitro

React Native provides a powerful way to build cross-platform mobile apps using JavaScript and React. However, there are times when developers need to interact with native platform features that are not exposed through React Native’s core APIs. That is where native modules come in. Over time, React Native has evolved with multiple approaches for building native modules: Legacy Native Modules usi...

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4m read
What Are Browser-Aware AI Coding Tools?
DEV Community • 2026-04-21 11:52

What Are Browser-Aware AI Coding Tools?

frontman-ai / frontman The AI agent that lives in your framework/browser Ship frontend changes from your browser — no code editor needed Frontman is an open-source AI coding agent that lives in your browser. It hooks into your dev server as middleware and sees the live DOM, com...

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5m read
DEV Community • 2026-04-21 11:50

How AI Agents Can Find the Cheapest Products in Singapore

Singapore shoppers are well-trained comparison buyers. Before buying a laptop, a phone, or even a kitchen appliance, most will check Lazada, Shopee, and Qoo10 — often in parallel tabs. It works, but it is slow and manual. AI shopping agents are changing this. Instead of opening five tabs, you ask once. The agent searches, compares, and gives you the best option with a direct link to buy. ...

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2m read
DEV Community • 2026-04-21 11:46

Data Transfer Object (DTO) in NestJS

A Data Transfer Object (DTO) is a design pattern used in NestJS to define how data is structured and transferred between different layers of an application, particularly between the client and the server. It acts as a blueprint that specifies what kind of data is expected, ensuring consistency and clarity in communication. Instead of working directly with raw request data, developers use DTOs to c...

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1m read
DEV Community • 2026-04-21 11:44

Claude Expert: The 4 Official (Free) Anthropic Courses

On LinkedIn, everyone's an "AI expert". Three ChatGPT prompts, a 12-hour bootcamp, a blue badge, done. In reality, almost no one has taken the official Claude courses Anthropic published. They exist. They're free. And they're the only source that actually counts. "Using Claude" is not "being a Claude expert" Using Claude means opening a conversation and asking a question. Plenty of peo...

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5m read
DEV Community • 2026-04-21 11:43

95% of PII Redaction Doesn't Need an LLM. The Other 5% Is Where Your Masker Leaks.

A VP at an SAP shop told me recently: "Every time we copy production to our lower environments, PII leaks. And no, we're not throwing an LLM at it. That's a thousand times the compute of what we already run." He's right. Most of the PII redaction problem in enterprise data isn't a neural network problem. It's a lookup table problem. And the incumbents already solve it. SAP TDMS, Delphix, Informa...

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3m read
DEV Community • 2026-04-21 11:40

Why we replaced LangChain with the raw Anthropic SDK in production

LangChain was the right answer in 2023. It abstracted away a messy ecosystem of half-baked provider APIs, gave you a unified LLM interface, and let you stitch agents together with a few dozen lines of Python. We used it everywhere — including in production on Vettio, our AI recruitment platform. In April 2026, we ripped it out. This post is about why we made that call, what replaced it, and the ...

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3m read
Product Hunt — The best new products, every day • 2026-04-21 11:30

Skyty

Your flight's altitude, ground speed, nearest airport + ETA Discussion | Link

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1m read
Hacker News: Front Page • 2026-04-21 11:30

Tim Cook's Impeccable Timing

Article URL: https://stratechery.com/2026/tim-cooks-impeccable-timing/ Comments URL: https://news.ycombinator.com/item?id=47847324 Points: 5 # Comments: 0

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1m read
No Exploit Needed: How Attackers Walk Through the Front Door via Identity-Based Attacks
The Hacker News • 2026-04-21 11:30

No Exploit Needed: How Attackers Walk Through the Front Door via Identity-Based Attacks

The cybersecurity industry has spent the last several years chasing sophisticated threats like zero-days, supply chain compromises, and AI-generated exploits. However, the most reliable entry point for attackers still hasn't changed: stolen credentials. Identity-based attacks remain a dominant initial access vector in breaches today. Attackers obtain valid credentials through credential stuffing

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1m read
Why is port 3000 always in use?
DEV Community • 2026-04-21 11:29

Why is port 3000 always in use?

We just shipped Dev Ports in Room Service. A new way to see and manage active local development servers across your Mac. Dev Ports brings local server visibility into the parts of the app where it is most useful: Home, the menu bar, smart notifications, Ops Feed, and the command panel. The goal was simple: make active local servers easier to notice and easier to act on, without constantly sw...

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1m read
Getting Data from Multiple Sources in Power BI: Building the Foundation of a Data Analytics Career
DEV Community • 2026-04-21 11:25

Getting Data from Multiple Sources in Power BI: Building the Foundation of a Data Analytics Career

Introduction Every meaningful insight in data analytics begins long before dashboards and visualizations. It starts with how you access, understand, and prepare your data. In Microsoft Power BI, data ingestion is not just a technical step; it is a core professional skill that separates entry-level users from confident, job-ready analysts. Many beginners focus heavily on visuals and ch...

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6m read
7 Hidden Burp Suite Features That Save Hours of Manual Testing (2026)
DEV Community • 2026-04-21 11:20

7 Hidden Burp Suite Features That Save Hours of Manual Testing (2026)

📰 Originally published on SecurityElites — the canonical, fully-updated version of this article. You’ve been using Burp Suite for a year. You know Proxy, Repeater, and Intruder. You feel reasonably competent. Then you watch a senior bug bounty hunter do a session review and they’re doing things you’ve never seen — requests filtering themselves based on response content, headers injecting auto...

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5m read
DEV Community • 2026-04-21 11:20

Claude Opus 4.7 is on Bedrock. Amazon just bet $25 billion it's the future. Here's what engineers need to know.

Two things happened this week that belong in the same sentence. On April 16, AWS added Claude Opus 4.7 to Amazon Bedrock — Anthropic's most capable publicly available model, with 87.6% on SWE-bench Verified and 69.4% on Terminal-Bench 2.0. Then on April 20, Amazon announced it would invest up to an additional $25 billion in Anthropic, on top of the $8 billion it had already committed — with Anthr...

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8m read
DEV Community • 2026-04-21 11:18

Design by Contract in Go: Panics, Preconditions, and checkContracts()

How panic for programming errors, error for user input, CONTRACT comments, checkContracts() invariant methods, and sorted-slice preconditions create a defense layer that catches bugs before they corrupt security verdicts. Your function receives a time value. It computes a duration. The duration is negative. The comparison says "exposure is less than the threshold." The control passes. The bucket ...

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10m read
DEV Community • 2026-04-21 11:18

How I finally stopped building custom push notification dashboards

Setting up Firebase or OneSignal for a project is usually the easy part. The real headache starts a few weeks later. If you work on any app with an active user base, you know the drill. The marketing or product team wants to run specific campaigns, A/B test some copy, or schedule notifications based on timezones. Suddenly, you are spending half your sprint building out a custom admin panel just s...

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2m read
Product Hunt — The best new products, every day • 2026-04-21 11:15

Cavalry Studio

Free Motion Design tool by Canva Discussion | Link

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1m read
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