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Knowledge base

Articles, guides, and developer references

Guides, tutorials, and references for software developers, from frontend to infrastructure.

nodejs

Mongoose 9 Migration Guide: What Actually Breaks in a Real MERN App

Upgrading to Mongoose 9? Here's what actually breaks in real MERN apps: pre-save hooks, plugins, TypeScript types, and how to fix each one.

Aug 16, 2026·12 min read·Zeeshan Tofiq
devops

Kubernetes Swap Support: Should You Turn It On in 1.35?

Kubernetes swap went stable in 1.35. Here's how it actually works, when it helps, when it hurts, and how to configure LimitedSwap correctly.

Aug 2, 2026·12 min read·Zeeshan Tofiq
rust

Rust Async Traits Still Aren't Object-Safe: The Real Fixes

Async fn in traits still isn't dyn-compatible in Rust. Here are the three real workarounds (enum dispatch, async-trait, RPITIT) and when to use each one.

Jul 24, 2026·14 min read·Zeeshan Tofiq
javascript

Deno Desktop Tutorial: Build a Native App From TypeScript, No Electron or Rust

A hands-on build of a real app with Deno 2.9's deno desktop command: Deno.serve() integration, window.bind() calls, WebView vs CEF, and packaging for macOS, Windows, and Linux.

Jul 24, 2026·12 min read·Zeeshan Tofiq
react

Mercor Frontend Engineer Interview: How to Prepare for AI Model Training Jobs

Getting a Mercor frontend engineer interview? Here's what the React and Next.js coding round actually tests, and how to prepare in a weekend.

Jul 20, 2026·17 min read·Zeeshan Tofiq
devops

Go 1.26 Goroutine Leak Detection: A Practical Guide

Go 1.26 ships a real goroutine leak profiler. Here's how to enable it, read the profile output, and catch leaks in production before OOMKilled does it for you.

Jul 18, 2026·13 min read·Zeeshan Tofiq
ai tools

Claude Code Skill Not Triggering? Every Cause and the Fix (2026)

Your Claude Code skill isn't triggering and there's no error. Here's every cause: paths, YAML, descriptions, and the hidden character budget.

Jul 16, 2026·14 min read·Zeeshan Tofiq
devops

Docker Compose to Podman Quadlet: A Practical Migration Guide

Convert a docker-compose.yml to Podman Quadlet files step by step, with a full example, rootless setup, and the daemon-reload gotchas that trip people up.

Jul 15, 2026·32 min read·Zeeshan Tofiq
typescript

Why Your TypeScript 7 Upgrade Broke ESLint, ts-jest, and ts-morph

TypeScript 7's native compiler breaks typescript-eslint, ts-jest, and ts-morph. Here's exactly why, and the side-by-side setup that fixes it.

Jul 14, 2026·11 min read·Zeeshan Tofiq
html css

CSS Anchor Positioning: Migrating shadcn/ui Off Radix

How to migrate shadcn/ui Popover and Tooltip from Radix UI to native CSS Anchor Positioning and the Popover API, with real before/after code.

Jul 12, 2026·19 min read·Zeeshan Tofiq
ai tools

MCP Server Disconnected? Here's the Actual Fix (2026)

Your MCP server shows disconnected in Claude Desktop, Claude Code, or Cursor. Here's exactly why, with fixes for stdout pollution, paths, and env vars.

Jul 12, 2026·16 min read·Zeeshan Tofiq
programming

Senior Full Stack System Design Interview Questions: How to Architect the Whole System (2026)

How senior full stack developers should answer system design questions: a complete framework covering frontend, API, database, and deployment in one story.

Jul 9, 2026·18 min read·Zeeshan Tofiq