Sampath KumarMedarametla

Drove eBay's passwordless authentication rollout across web and mobile for 130M+ active users — shipping WebAuthn biometric login, Google One-Tap, and Apple Sign-In. This made eBay one of the first major e-commerce platforms to enable biometrics as first-factor authentication on web browsers. Sign-in completion rates outperformed traditional passwords, especially on mobile.

The Google One-Tap integration alone increased sign-in completion 12% on mobile web and 5% on desktop, doubling overall sign-in volume across both platforms by removing authentication friction for returning users — directly improving conversion and session continuity for buyers and sellers.

Coordinated delivery across InfoSec, Privacy, Compliance, and Risk to ship features compliant with GDPR, CCPA, PSD2, and PCI-DSS across multiple jurisdictions, without slowing the release cadence.

Led seller onboarding and payment integration for eBay's platform-wide PayPal exit — part of the strategic migration that moved 18M sellers across global markets onto eBay's new managed payments system, completed ahead of schedule.

Managed 4 engineering teams (16 engineers, 5 QEs), coordinating seller data migration, Adyen payment integration, and onboarding workflows while holding transaction continuity for a live global marketplace.

Orchestrated API integration, seller account migration, and end-to-end QA across multiple payment rails — credit/debit, Apple Pay, Google Pay — with zero disruption to seller payout cycles during cutover.

Drove eBay's zero-downtime GCP → AWS migration, reducing platform latency by 15%. Coordinated cross-vendor engineering teams, designed the rollback protocols, and executed cutover with zero production incidents.

The result strengthened 24/7 SLA reliability for the global AI operations running on top of the platform.

Launched a GenAI chatbot across 5 global markets on schedule — deflecting 30%+ of Tier-1 support volume, improving CSAT by 3.5%, and reducing cost-per-contact across tens of millions of annual customer interactions.

Compressed international AI launch cycles 40% (10 weeks → 6 weeks) by building standardized deployment playbooks, localization workflows, and compliance checkpoints that removed re-work loops across all five countries.

Coordinated 80+ stakeholders across 6 organizations with zero executive escalations — AI engineering, product, ops, vendors, legal, and regional teams — from vendor selection through 3+ years of continuous iteration and hypercare, supporting a $3M+ AI program portfolio.