Long Nguyen

I’m a Senior Software Engineer at Google, focused on building and evolving large-scale payment platforms. I led the migration of legacy payment systems from monolithic architecture to distributed services, improving scalability and accelerating feature delivery by 50%. I also engineered the Flex Credit Settlement Framework with asynchronous auditing and distributed monitoring, reducing reconciliation latency and error rates by 25%.

I strengthen reliability through architecture, observability, and operational rigor. I established governance for backward-compatible API versioning and multi-region active-active deployments to ensure 99.99% availability, and I improved mission-critical workflow reliability using high-cardinality telemetry and distributed tracing to reduce MTTR with automated SLO-based alerting. I partner with Product to build capabilities like a dynamic configuration engine for targeted promotions (increasing user acquisition by 10%), and I institutionalize CI/CD guardrails and code review standards while mentoring engineers toward full-service ownership.

Before my current role, I architected and scaled Tier-0 tokenization services, migrating millions of users to Device PAN (DPAN) standards to eliminate transmission of sensitive PCI data. I integrated with global Token Service Providers like Visa and Mastercard, optimized transaction history in Cloud Bigtable (sub-20ms P99 latency), and improved data freshness via a high-throughput ingestion pipeline (reducing staleness by 40%). Early in my career at NETSCOUT, I built full stack features for an enterprise DDoS mitigation platform, led a 7-person threat intelligence team, and delivered core STIX TAXII functionality—earning recognition as a top 10% performer and promotion from Software Engineer I to III.