Key Achievements & Impact

• Architected scalable microservices system serving 100K+ users: Designed service boundaries, API contracts, and inter-service communication patterns, enabling platform to scale from 10K to 100K+ users with linear infrastructure costs. Collaborated with DevOps team on containerization strategy and Product team on feature delivery timelines.
• Optimized database performance with measurable business impact: Redesigned MongoDB schemas with strategic indexing and query optimization, reducing database query time by 55% and API latency from 500ms to 300ms (40% improvement). This enabled 2x increase in appointment booking capacity without additional infrastructure, directly supporting business growth objectives.
• Implemented multi-layer caching strategy: Built Redis-based L1/L2 caching for session management and API responses, achieving sub-200ms p95 latency while handling 10K+ requests/second. Reduced database load by 55%, enabling cost savings of ~30% on database infrastructure while improving user experience with faster response times.
• Designed payment integration with high reliability: Built payment gateway abstraction layer (Stripe, PayPal) with retry logic, idempotency, and transaction reconciliation, achieving 99.95% success rate. Worked closely with Finance team on reconciliation processes and Product team on payment flow UX, resulting in improved transaction completion rates.
• Built production-grade authentication & authorization: Implemented JWT-based auth service with refresh token rotation, RBAC, and secure session handling for 50K+ active users. Collaborated with Security team on HIPAA compliance requirements and Frontend team on token management strategies, ensuring seamless user experience across web and mobile platforms.
• Established observability and incident response: Implemented comprehensive logging (Winston), distributed tracing, APM integration, and real-time alerting, reducing Mean Time To Recovery (MTTR) from 2 hours to 20 minutes. Led post-incident reviews with cross-functional teams, improving system reliability to 99.9% uptime SLA.
• Designed for scale and resilience: Architected horizontal scaling with load balancing and database sharding patterns, enabling platform to handle 3x traffic spikes (e.g., during promotional campaigns) without service degradation. Made strategic trade-offs between consistency and availability, implementing circuit breakers and graceful degradation for high availability.
• Built scalable background job processing: Designed and implemented job queue system using Bull queue with Redis, processing 10K+ jobs/hour for notifications, scheduled tasks, and async operations. Collaborated with Product team to prioritize job types and optimize notification delivery, improving user engagement metrics.
• Led security implementation for healthcare compliance: Designed security middleware including rate limiting, request validation, input sanitization, CORS policies, and HIPAA-compliant audit logging. Worked with Compliance team to ensure regulatory requirements were met, enabling platform to serve healthcare providers across Saudi Arabia.
• Owned end-to-end backend operations: Responsible for system design, implementation, deployment, and on-call support for production healthcare platform. Led technical discussions with Product, Design, and QA teams on API contracts and system capabilities, ensuring alignment between technical implementation and business requirements.