Abdullah S.

• • Designed and built a full-stack multi-vendor marketplace end to end (Django REST Framework, React) as the sole engineer, owning architecture, API design, and deployment.• • Integrated Stripe and PayPal payments and multi-carrier shipping (FedEx, UPS, USPS) with vendor onboarding, launching the platform live in production at greatprecious.com.• • Deployed and managed production infrastructure on AWS (EC2, RDS, S3, CloudFront) with automated GitHub Actions CI/CD pipelines.

HIGH TECH

• • Engineered core backend services in Python (Django) and PostgreSQL for OLX Pakistan and Zameen.com, serving 1M+ monthly active users across classifieds and real-estate flows.• • Built an SEO-focused Django microservice generating dynamic landing pages and structured XML sitemaps for OLX Pakistan; implemented Redis response caching to reduce server load and improve crawl efficiency for Google indexing.• • Extended the notifications pipeline handling 50K+ daily events across both platforms; integrated OTP-based authentication flows into Keycloak (Java) covering login, password recovery, and order confirmation.

HIGH TECH

• • Conducted deep SQL performance profiling across a high-traffic legacy fintech codebase, eliminating 10+ redundant indexes and reducing average query execution time by 25%, directly improving production API latency under SLA constraints.• • Diagnosed and resolved production-critical incidents by tracing API failures, analyzing query execution plans, and applying targeted backend and environment fixes, minimizing customer impact and restoring service reliability.