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Hi, I'm Varun Velusamy 👋

Backend Software Engineer @ PayPal — Fintech & Crypto Systems

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About Me

I'm a backend engineer who builds and operates high-scale fintech and crypto systems where correctness, security, and reliability are non-negotiable. At PayPal, I work on payment, stablecoin, and reconciliation-heavy workflows under regulatory and time-sensitive constraints, supporting enterprise partners and millions of users.

  • 🏦 Currently building on a crypto trading platform processing $6B+ TPV and serving 7M+ users
  • 🌍 Shipped cross-border PYUSD ↔ Xoom stablecoin payout flows across 150+ countries
  • 🔗 Own an external-facing orchestration gateway for enterprise crypto transfers (Hyperwallet) used by partners like Google and Toptal
  • ⚡ Delivered backend systems for a time-critical $2B+ crypto distribution under regulatory deadlines
  • 🎓 B.Tech CSE, Vellore Institute of Technology (CGPA 9.18) · Published research in IJERT on safe-route recommendation systems

Tech Stack

Java Spring Boot Microservices Python SQL TypeScript JavaScript

GCP REST APIs CI/CD Azure

Experience

PayPal — Software Engineer · Sept 2022 – Present · Chennai

  • Built backend features for a high-throughput crypto trading platform processing $6B+ TPV in 2025, serving 7M+ users
  • Designed cross-border remittance flows integrating PYUSD with Xoom for compliant stablecoin payouts across 150+ countries via partners such as Cebuana and YellowCard
  • Owned an enterprise crypto transfer orchestration gateway (Hyperwallet) — auth, idempotency, retries, rate limiting, reconciliation, and compliance orchestration
  • Delivered backend systems for a time-critical $2B+ crypto distribution to Celsius customers, meeting regulatory timelines
  • Recipient of PayPal's Spot Award for end-to-end ownership across Payments, Settlement, and Activities domains

Societe Generale GSC — Software Engineer · Jul 2021 – Sept 2022 · Bengaluru

  • Built and operated Spring Boot microservices on Azure, processing 1M+ records/day with fully automated CI/CD
  • Delivered an application-wide preferences platform, standardizing user configuration management across services
  • Built a lightweight integration layer for external vendor trade data reconciliation with fault-tolerant data exchange

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