I am an Enterprise Backend Architect and Founder & CEO of ITSTHS PVT LTD with 10+ years of hands-on experience designing, scaling, and modernizing complex digital ecosystems. My engineering focus centers on high-throughput distributed systems, zero-downtime legacy refactoring, multi-tenant databases, API security, and agentic AI automation.
- 🏢 CEO & Founder: Leading ITSTHS PVT LTD, delivering enterprise software, ERP/CRM platforms, cloud infrastructure, and AI engineering.
- 🏛️ Architecture Specialties: High-concurrency systems (PHP 8.2+, Laravel, Spring Boot), event-driven queues (RabbitMQ), caching tiers (Redis, Memcached), and microservices.
- 🔄 Legacy Modernization: Safely migrating legacy codebases (PHP 5.4 to 8.2+) to modern PSR/SOLID architectures without operational downtime.
- 🤖 Agentic AI & Automation: Building production LLM workflows, autonomous agent swarms, and webhook automation using self-hosted n8n and Docker.
- 🛡️ Security & Compliance: OWASP Top 10 mitigation, zero-trust API authentication, and regulatory architectures (ZATCA e-invoicing, HIPAA, PCI-DSS).
| Languages & Runtimes |
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| Frameworks & Architecture |
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| Databases & In-Memory |
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| DevOps, Cloud & Queues |
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| AI, Automation & Security |
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| 01. Scalable Backends | 02. Zero-Downtime Modernization | 03. Agentic Workflows |
|---|---|---|
| • High concurrency & low latency • Distributed caching (Redis/Memcached) • Idempotent REST API architecture • Multi-tenant database partitioning |
• Automated AST upgrades (Rector) • Dual-container staging (Docker) • Zero revenue disruption • PHPStan level 8 type safety |
• Production LLM reasoning loops • Multi-agent automated pipelines • Self-hosted n8n engine • Webhook & queue orchestration |
- High Concurrency & Low Latency: Designing database-sharded, event-driven backends capable of serving thousands of simultaneous requests under strict sub-100ms latency budgets.
- Enterprise Multi-Tenancy: Building isolated tenant architecture patterns (database-per-tenant, schema-per-tenant, and row-level tenant partitioning) with strict tenant leakage prevention.
- Legacy Modernization: Refactoring monolithic codebases with Rector, PHPStan level 8, and automated regression suites, replacing raw SQL with secure prepared PDO statements.
- Intelligent Automation: Deploying Docker-orchestrated agentic workflows that bridge CRM, WhatsApp Business API, marketing automation, and multi-channel publishing.
I write in-depth architectural guides on muhammadjunaidkhan.com/blog. Here are selected engineering case studies:
- 📖 How to Upgrade Legacy PHP 5.4/7.x to PHP 8.2 Without Downtime: A 6-phase engineering blueprint for CTOs and backend leads to eliminate technical debt without business disruption.
- 📖 Architecting Resilient API Rate Limiting with Redis Token Buckets: Preventing cascading microservice failures with distributed sliding window counters.
- 📖 High-Concurrency MySQL vs Redis Cache-Aside Patterns in PHP: Eliminating race conditions, thundering herds, and cache stampedes in mission-critical applications.
- 📖 Multi-Tenant Database Architecture: Isolation vs Shared Partitioning: Solving data isolation, cross-tenant reporting, and compliance at enterprise scale.
- 📖 Building Autonomous Social Distribution Engines with Self-Hosted n8n: Orchestrating automated multi-platform distribution via Docker on zero SaaS overhead.
Whether you are looking to scale your engineering backend, modernize an enterprise legacy system, or explore software consulting:
- 🌐 Portfolio & Case Studies: www.muhammadjunaidkhan.com
- 🏢 Company: ITSTHS PVT LTD
- 💼 LinkedIn: linkedin.com/in/junaidkhan00
- 🐦 Twitter / X: @junaidkhan23
- 💬 WhatsApp: +92-319-487-8470
- 📬 Direct Email: ask@muhammadjunaidkhan.com
Built with engineering discipline by Muhammad Junaid Khan. Copyright © 2026 ITSTHS PVT LTD. All rights reserved.