Jayaseelan Shanmugam
Principal Software Engineer @PayPal
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WORK HISTORY
Principal Software Engineer @PayPal
San Jose, CA, US
As a Payments Platform Architect at PayPal, I lead the end-to-end design and architectural governance of the global payments infrastructure, supporting critical domains such as Transaction Processing, Vault, Stored Value, Cards, Issuance & Tokenization, and Banking. I collaborate with 800+ engineers and a network of domain architects to shape the architectural direction and ensure platform scalability, security, and resilience.My focus is on building future-ready payment systems that align with PayPal’s enterprise vision. This includes modernizing our monolithic infrastructure through cell-based cloud architecture, governing architectural decision records (ADRs), and leading initiatives like the Everett Payments Data Hub and the Elevate Payments Partnership. I’ve architected platforms that process hundreds of billions in payment volume, manage petabytes of financial data, and meet complex compliance and regulatory demands.I actively represent the payments domain in enterprise-wide forums, drive cloud migration strategy, and define the long-term technical roadmap for PayPal’s core payments capabilities. My passion lies in transforming legacy systems into modern, scalable, and intelligent platforms that enable growth, innovation, and global expansion.
EDUCATION
Central Polytechnic
Diploma in Civil Engineering, Diploma in Engineering
University of Madras
Bachelor of Engineering (B.E.), Bachelor of Engineering
The University of Texas Permian Basin
Master of Business Administration - MBA, Business Administration and Management, General
Sri Ramakrishna Mission Higher Secondary School, T Nagar
SSLC, SSLC
Institute of Rail Transport
Diploma in Multi Model Transport & Logistics Management, Post Graduate Diploma in Multi Model Transport & Logistics Management
SKILLS
ABOUT JAYASEELAN SHANMUGAM
I am a seasoned Payments Platform Architect with 20+ years of experience designing and modernizing large-scale, mission-critical financial systems. At PayPal, I lead the architecture and strategic direction for the core payments platform, overseeing transaction processing, vault, stored value, card issuance, and tokenization systems. My work spans 800+ engineers, 700+ services, and aligns closely with enterprise-wide modernization goals.I specialize in building resilient, cloud-native platforms using cell-based architecture, ensuring global scalability, compliance, and performance. I’ve architected high-impact programs such as the Everett Payment Data Hub, Elevate Payments Partnership, and geo-expansion into China. My expertise includes real-time event streaming, data reconciliation, multi-acquirer frameworks, and regulatory-driven platform transformation.My background also includes architecting enterprise SOA platforms for global banks, regulatory reporting for MiFID compliance, and performance-critical billing engines.I thrive at the intersection of technology, business strategy, and platform scalability—and I’m passionate about modernizing financial infrastructure to support global innovation.
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