Karan Kumar Ratra

Walmart Global Tech· Sunnyvale, CA

Innovative E-Commerce Systems Architect and Technology Leader in Retail Technology

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Driving Scalable Retail Innovation

Karan Kumar Ratra is a Senior Engineering Leader at Walmart Global Tech, where he leads globally distributed engineering teams building high-throughput, event-driven systems for the world’s largest retailer. With more than 16 years of experience across e-commerce, fintech, and telecom, he has architected and scaled platforms that handle 100M+ daily messages and power mission-critical retail operations.

Over the course of his career, Karan has delivered transformative technology initiatives:

  • Walmart Fulfillment Management System (FMS): Architected and evolved Walmart’s core fulfillment platform, improving efficiency by 25% and reducing operational costs by 15%.
  • PayPal Risk & Compliance Systems: Built compliance APIs and frameworks that prevented a potential $10M regulatory fine, earning him the prestigious PayPal Golden Envelope Award.
  • Subex Credit Risk Management Platform: Designed scalable credit risk engines now deployed at Tier-1 and Tier-2 telecom operators worldwide.

Karan is also recognized as a thought leader and mentor:

  • Awards: Walmart Impact Award 2024, multiple Walmart Excellence Awards, PayPal Golden Envelope Award, eBay Skunkworks Hackathon Winner, and more.
  • Mentorship & Community: Top 1% Mentor on ADPList, Judge and Mentor at global hackathons including HackMIT, HackHarvard, and NASA Space Apps Challenge.
  • Scholarship & Recognition: Senior IEEE Member, Distinguished Fellow of the Soft Computing Research Society (SCRS), Raptor Fellow, and Globee Award Winner (Technology Innovator, Engineering Excellence).

He is passionate about scalable distributed systems, event-driven architectures, and AI-driven innovation in retail technology. Beyond his technical expertise, Karan focuses on mentorship, cross-functional leadership, and fostering engineering excellence to deliver measurable business impact.

Selected Publications

  1. IEEE Xplore
    AI and Generative AI-Driven Automation for Multi-Cloud and Hybrid Cloud Architectures: Enhancing Security, Performance, and Operational Efficiency
    Dhruv Kumar Seth, Karan Kumar Ratra, and Aneeshkumar P. Sundareswaran
    In 2025 IEEE 15th Annual Computing and Communication Workshop and Conference (CCWC), Jan 2025
  2. IEEE Xplore
    Energy-Efficient Microservices Architecture for Large-Scale E-Commerce Platforms
    Karan Kumar Ratra, Dhruv Kumar Seth, and Sriram Uppuluri
    In 2025 IEEE Conference on Technologies for Sustainability (SusTech), Apr 2025
  3. IEEE Xplore
    Time-Bound Deferred Authorization in 3DS 2.0: A Novel Approach to Balancing Security and User Experience in E-Commerce Payment Authentication
    Aneeshkumar P., Dhruv Kumar Seth, Karan Kumar Ratra, and 1 more author
    In 2025 IEEE 15th Annual Computing and Communication Workshop and Conference (CCWC), Jan 2025
  4. IJCTT
    Unlocking the Power of AI for Shift-Left Testing – A Game Changer in Automation
    Karan Kumar Ratra, Gaurav Sharma, and Dhruv Kumar Seth
    In International Journal of Computer Trends and Technology (IJCTT), Volume 72, Issue 12, December 2024, Nov 2024
  5. IJCTT
    Efficient Deployment and Updating of Features in Load-Balanced Elastic Distributed System
    Dhruv Kumar Seth, and Karan Kumar Ratra
    In International Journal of Computer Trends and Technology (IJCTT), Volume 72, Issue 9, September 2024, Nov 2024
  6. IJGIS
    Unified Cloud Governance: Enhancing API Management and Digital Security with Knowledge Graphs
    Rangarajan Lakshminarayanachar, Dhruv Kumar Seth, and Karan Kumar Ratra
    In International Journal of Global Information Systems (IJGIS), Aug 2024
  7. IJRASET
    Pattern Play: Advanced API Integration for Cutting-Edge Applications
    Dhruv Kumar Seth Seth, Karan Kumar Ratra, Rangarajan Lakshminarayanachar, and 2 more authors
    In International Journal for Research in Applied Science and Engineering Technology (IJRASET), Volume 12, Issue 7, July 2024, Jul 2024