Amaanullah Khan
PHP & Laravel Developer
Also: Flutter mobile apps
PHP & Laravel developer in Karachi - custom CRM, SaaS & enterprise web apps for global clients.
Download CVMulti-Tenant CRM - High-Performance Sales & Operations Management System
Project Overview
The Business Problem
Sales and operations teams were outgrowing spreadsheet-based lead tracking and single-company CRM tools. The product needed to serve multiple client companies from one platform — each with isolated data, separate user bases, and custom pipeline rules — while handling lead volumes that would break most off-the-shelf SaaS plans.
The core requirements were clear: ingest leads at high volume, assign them automatically, support 300+ concurrent users without slowdown, and keep every tenant's data completely separate. Generic CRM subscriptions could not deliver that combination at a sustainable cost.
Solution Overview
I architected and built the Laravel backend for a multi-tenant sales and operations CRM — a production system now managing 1.5M+ leads across isolated tenant environments. The platform covers lead ingestion, assignment rules, pipeline stages, internal chat, reporting, and admin oversight for super-admin monitoring.
Each tenant operates in a private data bubble: leads, users, files, and conversations are scoped by tenant ID at the middleware layer — not just filtered in the UI. That design choice prevents cross-tenant data leaks, which is non-negotiable in a B2B SaaS CRM.
Architecture & Key Modules
My Role
As backend lead on this production build, I owned Laravel architecture, database design, queue strategy, tenant isolation logic, and performance optimization for high-concurrency production load. I also integrated WebSocket services and built the bulk processing engine that keeps imports from blocking live users.
Results at Production Scale
The system runs under daily business pressure — not demo traffic. Search stays sub-second across 1.5M+ records, the platform maintains 99.9% uptime with 300+ active sessions, and tenants onboard thousands of leads in minutes without duplicates or system lag. See also my Laravel developer services and custom CRM development pages for similar builds.
Strategic Execution & Challenges
Scaling to 1.5M+ Leads Without Query Collapse
At 1.5 million records and 300+ concurrent users, unoptimized queries and synchronous imports would freeze the platform during peak sales hours.
I implemented composite indexing, query refactoring, Redis caching for hot paths, and moved bulk imports to background queue workers with live progress tracking.
Sub-second search across the full lead database and stable performance during 10,000+ record bulk uploads — with 99.9% uptime in production.
True Multi-Tenant Data Isolation
Hosting multiple companies on one platform required absolute data silos. Any cross-tenant leak in leads, chat, or files would be a catastrophic security failure.
I built tenant-scoped middleware that validates every query, separate file directories per tenant, and encrypted session tokens tied to tenant context.
Each client company operates in a fully isolated environment while super-admin retains safe aggregated monitoring across tenants.
Real-Time Coordination for 300+ Users
Coordinating a large sales team through external messaging apps created security risks and context loss — conversations were disconnected from lead records.
I integrated a WebSocket-based internal chat system scoped to CRM workflows, with messages linked to leads and tenant boundaries enforced.
Faster team coordination, eliminated third-party messaging costs, and full conversation history tied to the sales pipeline.
Bulk Lead Import Without Duplicates or Timeouts
Uploading thousands of leads at once caused HTTP timeouts, duplicate records, and manual cleanup work for operations teams.
I engineered a bulk processing engine with background workers, real-time de-duplication checks, and a progress dashboard for import monitoring.
Tenants onboard 10,000+ leads in minutes with zero duplicates and no impact on live user performance.
Technology Stack
What This Project Proves
Multi-tenant CRM is not a configuration toggle — it is an architecture decision that affects every query, file path, and permission check. This build demonstrates that a Laravel Developer in Pakistan can deliver enterprise-grade SaaS backends that compete with Western agency output, at production scale, with real metrics behind the claims.
If your business has outgrown HubSpot or Salesforce pricing — or you need tenant isolation, custom lead logic, and full data ownership — this is the type of system I build. Contact me to discuss a similar CRM or SaaS backend project.
