Raheel Shehzad

Senior Backend Engineer & Enterprise Integration Specialist

Specializing in robust server-side architecture and seamless systems integration, I build scalable, high-performance web applications that drive core business operations. From high-volume e-commerce platforms to complex ERP/CRM pipelines and secure payment processing, my focus is on delivering secure, reliable, and maintainable software tailored for growth.

Core Areas of Expertise

• Backend Development

  • Architecting scalable, modular server-side logic using modern backend frameworks and database systems (SQL and NoSQL).

  • Optimizing database queries, caching strategies, and server performance for high concurrency, low latency, and zero downtime.

• CRM & ERP Integration

  • Connecting enterprise platforms (Salesforce, HubSpot, SAP, NetSuite, Zoho) to automate cross-functional data flows.

  • Synchronizing inventory, customer records, and order fulfillment in real-time while eliminating manual data entry bottlenecks.

• API Design & Integration

  • Building and consuming RESTful and GraphQL APIs with clean documentation (OpenAPI/Swagger), robust authentication (OAuth2, JWT), and strict rate-limiting.

  • Creating resilient webhook pipelines and middleware to bridge disjointed third-party software into cohesive ecosystems.

• Payment Gateway Integration

  • Implementing secure, PCI-DSS-compliant transaction workflows with gateways like Stripe, PayPal, Square, and regional providers.

  • Handling multi-currency checkouts, subscription billing, automated invoicing, webhooks for chargebacks/refunds, and fraud prevention protocols.

• E-Commerce Development

  • Developing custom e-commerce engines and tailoring platforms (Shopify, WooCommerce, Magento) for frictionless user journeys.

  • Designing custom product catalogs, dynamic pricing rules, stock tracking, and automated fulfillment workflows built to handle traffic spikes.