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Product Hunt — The best new products, every day • 2026-04-21 13:17

Reference Board

Infinite Canvas for your ideas Discussion | Link

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DEV Community • 2026-04-21 13:17

How I handle Claude API rate limits without losing user messages (with code)

How I handle Claude API rate limits without losing user messages (with code) Rate limits hit at the worst possible moment. Your user is mid-conversation, they send a message, and instead of a response they get a 529 error. Here's exactly how I handle this in SimplyLouie — a $2/month Claude wrapper with ~100 concurrent users. The problem Claude's API returns a few different ...

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4m read

DEV Community • 2026-04-21 13:17

Implementing a Centralized Metrics Layer with dbt and a Semantic Layer

Why centralizing metrics stops dashboard wars Design patterns in dbt: atomic models and metric definitions Testing, lineage, governance that make metrics trustworthy How to expose a semantic layer so BI consumes one truth A step-by-step protocol to build and ship your metrics layer A single, versioned metric definition is the difference between a team that answers questions and a team that argu...

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DEV Community • 2026-04-21 13:16

Building a Time-Series Storage Engine in Go That Handles Billions of Data Points

As a best-selling author, I invite you to explore my books on Amazon. Don't forget to follow me on Medium and show your support. Thank you! Your support means the world! Imagine you're trying to store every temperature reading from a thousand weather stations, each sending data every second. That's 86,400 readings per station daily. After a month, you're looking at billions of numbers. Traditi...

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DEV Community • 2026-04-21 13:13

What Surprised Me About Building a Python RAG Pipeline with Open-Source LLMs

If you've ever tried using ChatGPT to answer questions about your company's docs or codebase, you know the pain: hallucinations, half-right answers, or just plain nonsense. Retrieval-Augmented Generation (RAG) is supposed to fix this, right? But what happens when you swap out the fancy OpenAI API for open-source models? That’s where things got interesting for me—and not always in a good way. ...

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5m read

DEV Community • 2026-04-21 13:13

Building Delaware: The Backend of Everything.

Building Delaware: The Backend of Everything Most developers don’t think about backend systems until they break. That’s the problem. Modern software is built on layers of abstraction—frameworks on top of frameworks, services on top of services. It works… until it doesn’t. Then everything becomes slow, fragile, and difficult to scale. I’m building Delaware to change that. ...

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I Built an AI Gateway from Scratch (So You Don't Have To)

DEV Community • 2026-04-21 13:11

I Built an AI Gateway from Scratch (So You Don't Have To)

TL;DR I built a local AI gateway using Envoy, Rust, and Kubernetes to understand how AI traffic actually works. It broke multiple times. I fixed it. I learned a lot. Why I Did This I wanted to understand how AI gateways actually work. Not the diagrams. Not the marketing slides. The real system — the code, the flow, the failures. So I built one. Three weeks later, I had s...

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HackerNoon • 2026-04-21 13:09

How Retail Coupon Data Changed the Way I Think About Growth Systems

Growth systems plateau when built on segments and averages. Moving to real-time, probability-based decisions improves performance and ROI.

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DEV Community • 2026-04-21 13:08

Why ML Models Break After Deployment

Many machine learning models perform great during training—but start failing once they reach production. From my recent learning in MLOps and AI testing, I’ve realized that the issue isn’t usually the model itself. It’s the lack of operational practices like monitoring, drift detection, safe deployments, and retraining. I wrote a short post explaining: why ML models degrade in production how data...

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Top 10 Programming Languages by Actual Coding Time (Not GitHub Stars)

DEV Community • 2026-04-21 13:08

Top 10 Programming Languages by Actual Coding Time (Not GitHub Stars)

Every "top programming languages" list you've seen is based on GitHub stars, Stack Overflow surveys, or job postings. None of them measure what developers actually spend their time writing. We do. Here's the ranking based on thousands of hours of real IDE coding time across 200+ programming languages, tracked from active B2B developers at 100+ B2B companies. Why Existing Rankings Are Mi...

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6m read

Hacker News: Front Page • 2026-04-21 13:08

Anthropic takes $5B from Amazon and pledges $100B in cloud spending in return

Article URL: https://techcrunch.com/2026/04/20/anthropic-takes-5b-from-amazon-and-pledges-100b-in-cloud-spending-in-return/ Comments URL: https://news.ycombinator.com/item?id=47848276 Points: 4 # Comments: 2

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How Team Size Affects Productivity: Brooks's Law in Real Data

DEV Community • 2026-04-21 13:07

How Team Size Affects Productivity: Brooks's Law in Real Data

"Adding manpower to a late software project makes it later." Fred Brooks wrote that in 1975. Fifty years later, engineering leaders still debate whether it's true. We looked at real coding data from 100+ B2B companies on PanDev Metrics to understand how team size relates to individual developer productivity. The answer is more nuanced than Brooks suggested — but his core insight still holds. ...

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7m read

DEV Community • 2026-04-21 13:07

Anthropic's MCP Has a Design Flaw It Won't Fix. Here's What Developers Need to Do Now.

Security firm OX Security spent months working through 30+ responsible disclosure processes before publishing their findings this week: Anthropic's Model Context Protocol has a fundamental architectural vulnerability, and Anthropic has decided not to fix the root cause. What the flaw is The vulnerability lives in MCP's STDIO interface, the mechanism MCP uses for local transport when an...

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The AI Copilot Effect: How AI Assistants Changed Coding Time in 2026

DEV Community • 2026-04-21 13:07

The AI Copilot Effect: How AI Assistants Changed Coding Time in 2026

AI coding assistants went from novelty to necessity in under three years. GitHub Copilot, Cursor, Cody, and dozens of alternatives now sit inside developers' editors, suggesting code, answering questions, and writing boilerplate. A Deloitte report on AI adoption in software development estimates that ~70% of enterprise development teams now use some form of AI coding assistance. But are they actu...

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8m read

DEV Community • 2026-04-21 13:06

Active/Active Multi-region - Chat application Architecture

In the previous post I covered how I connected two Kubernetes clusters across Mongolia and Germany using Netbird. That was the networking layer — pods can reach each other, DNS works across clusters. Now the interesting part: making the actual application work active/active across both regions. Active/active means both clusters run independently and serve users, but a user on cluster A can chat w...

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I Built a Vector Database Project from Scratch — Here’s What Actually Happened

DEV Community • 2026-04-21 13:06

I Built a Vector Database Project from Scratch — Here’s What Actually Happened

A few weeks ago, I decided to stop just reading about vector databases and actually build something with them. Not a tutorial clone. Not a copy-paste project. Something messy, slightly broken, and real. This is a write-up of what I built, what I learned the hard way, and what I would not do again. Why I Started This Everywhere I looked, people were talking about embeddings, sem...

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4m read

DEV Community • 2026-04-21 13:05

How I Built a Telegram Video Avatar Bot With Python and FFmpeg

I tried to set a video avatar on Telegram last month. Recorded a short clip on my iPhone, uploaded it, and nothing happened. No error message. No toast notification. Telegram just silently rejected it. Turns out iPhone records in HEVC (H.265) by default since the iPhone 7. Telegram's video avatar system only accepts H.264. When you upload HEVC, the server validates it, fails, and tells you absolu...

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I Froze a TCP Connection for 10 Minutes and Migrated It to Another Server

DEV Community • 2026-04-21 13:05

I Froze a TCP Connection for 10 Minutes and Migrated It to Another Server

Spot instances are 80% cheaper, but AWS kills them with a 2-minute warning. If you are running stateless web requests, that’s fine. But if you are running modern LLM reasoning workloads—where a single request can take minutes to process—a 2-minute warning is a death sentence. Losing a node means losing gigabytes of computed KV Cache and instantly snapping the client's connection. User experience ...

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DEV Community • 2026-04-21 13:04

The Engineering Math Behind Energy Recovery Wheels: Decoding ASHRAE Effectiveness Formulas

Energy recovery wheels can achieve up to 80% total effectiveness in ideal conditions, but that number hides complex thermodynamic interactions between temperature and humidity transfer that many engineers oversimplify. The Formula The ASHRAE effectiveness formulas for energy recovery wheels represent elegant applications of heat and mass transfer principles. The sensible effectiveness ...

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5m read

How I Decide Whether Module Federation Is Worth It

HackerNoon • 2026-04-21 13:04

How I Decide Whether Module Federation Is Worth It

Module Federation enables cross-framework UI sharing, but adds complexity. Use it only when reuse and independent scaling outweigh the costs.

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