Khalid Arafa
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Khalid Arafa

Senior web and mobile development for teams that need reliable CRM, ERP, and automation systems.

Remote · Worldwide

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What I Build

  • Custom CRM Systems
  • ERP Platforms
  • Workflow Automation
  • Web & Mobile Apps
  • AI Integrations

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Availability

Open for selected freelance and long-term product engagements.

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Blog

Engineering insights on CRM, ERP, AI automation, and scalable product delivery

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Scaling WebSocket Connections: What Breaks Past a Few Thousand Concurrent Users
Developmentby Khalid Arafa

Scaling WebSocket Connections: What Breaks Past a Few Thousand Concurrent Users

WebSockets don't scale like REST APIs, they're stateful, long-lived connections, and that single difference breaks chat and notifications past a few thousand concurrent users. A breakdown of what actually needs to change: shared pub/sub state, connection-aware load balancing.

Read more →12 Sept 2026
From 0 to 100K Users: Handling Users Smoothly from the Mobile App Client to the Backend
Developmentby Khalid Arafa

From 0 to 100K Users: Handling Users Smoothly from the Mobile App Client to the Backend

What actually breaks as a Flutter app scales isn't the UI — it's how sessions, token refresh, and concurrent writes are handled between the client and backend. A technical breakdown of the user-lifecycle failures that show up between 1K and 100K users.

Read more →7 Sept 2026
API Security Checklist for SaaS Builders
Developmentby Khalid Arafa

API Security Checklist for SaaS Builders

Most SaaS breaches aren't zero-days, they're missing auth checks, leaked keys, and endpoints nobody remembered to lock down. Here's the checklist that actually prevents them.

Read more →22 Aug 2026
Next.js SEO: What Actually Moves the Needle
Developmentby Khalid Arafa

Next.js SEO: What Actually Moves the Needle

Rebuilt your site in React and watched traffic drop? Here's what Google actually sees, and the three fixes that matter more than any plugin.

Read more →31 May 2026