Ads Platform & PayPal+ Loyalty

• Designed and scaled backend ad infrastructure serving 25M+ daily users, achieving sub-100ms p99 latency and 99.99% uptime across globally distributed systems.

• Built and optimized Java/Spring Boot microservices powering Ads and Loyalty platforms, supporting 1M+ users and driving $4M+ incremental revenue.

• Developed event-driven architectures (AMQ/Kafka) and optimized Oracle/BigQuery queries, reducing transaction latency by up to 30%.

• Led system design, implemented Datadog observability, improved incident response time by ~60%, and mentored engineers on scalable backend best practices.

• Built scalable web conferencing platform with advanced scheduling and collaboration features, saving $50K annually in operational costs.

• Improved frontend performance by 40% through lazy loading, caching, and code splitting using React and Redux.

• Established CI/CD pipelines (GitHub Actions) and containerized applications with Docker, reducing deployment time by 50%.

• Migrated monolithic healthcare claims system to a microservices architecture using Spring Boot, RabbitMQ, and Redis, reducing processing time by 30%.

• Designed resilient GraphQL APIs with Resilience4j (circuit breakers, retries), ensuring high availability and fault tolerance.

• Implemented Prometheus/Grafana monitoring and ELK logging, cutting troubleshooting time by 40%.

• Optimized SQL Server performance for 4M+ records using indexing, partitioning, and sharding, reducing query time by 40%.

Mentored 50+ students in understanding data structures and algorithms concepts and graded student submissions