Wahab E is a skilled Software Engineer with deep expertise in Ruby on Rails, scalable API development, and high-performance backend architectures, delivering production systems that handle 50K+ daily requests at Elgrocer by Smiles (Etisalat Group). He has built and optimized core e-commerce features—including multi-version REST APIs using Grape, a robust wallet transaction engine, Tabby payment integration, advanced promo rule logic, multi-shipment order flows, and real-time ETAs via Locus—while cutting database load by 60% through Redis caching, N+1 query elimination, and Sidekiq-driven background processing. Wahab has strengthened platform reliability with IP-based rate limiting, OTP-enabled bilingual email verification, and flexible throttling, and has automated B2B onboarding workflows with CRM integrations for real-time rewards and tiered benefits. With strong competency in PostgreSQL, Redis, MongoDB, AWS, microservices, and performance tuning—as well as familiarity with GraphQL, Docker, Angular, and modern DevOps practices—he consistently delivers efficient, secure, and scalable backend solutions.