Abdul Khadar

About Abdul Khadar

With over 2 years of Software Development experince, I specialize in MERN Stack…

Experience

1. Senior Full Stack Java Developer

   Visa

   Dec 2023 — Present · Foster City, CA, US

   As a Senior Java Developer at Visa, I designed and implemented scalable microservices on Spring Boot to process global payment transactions with sub-millisecond latency, ensuring high availability and reliability. I collaborated with data science teams to integrate AI/ML models for fraud detection and risk scoring using TensorFlow and AWS SageMaker, operationalizing predictive analytics directly in transaction workflows.• I built Kafka-based streaming pipelines to orchestrate billions of real-time events with guaranteed throughput and consistency. Architected RESTful APIs aligned with OpenAPI standards and piloted GraphQL APIs, enabling secure and flexible integrations for partner banks and fintech platforms worldwide. I also developed reactive WebFlux services to handle massive concurrent requests while meeting strict SLAs.• My infrastructure contributions included Docker + Kubernetes deployments, Terraform-based IaC, and AWS API Gateway configurations for security, throttling, and multi-tenant compliance. I optimized CI/CD pipelines with Jenkins/GitLab, automated fraud model retraining, and embedded extensive unit, integration, and BDD testing (Cucumber, Karate) to maintain production quality.• I enhanced PostgreSQL performance with indexing and partitioning, reduced latency through JVM and GC tuning, and applied PCI-DSS compliant security with OAuth2, encryption, and layered access controls. For monitoring and reliability, I deployed Prometheus and Grafana dashboards to track AI model health, service metrics, and workflows.• Beyond engineering, I mentored junior developers, led Agile ceremonies, and drove cross-team collaboration with product, security, and UX teams. I also contributed to industry conferences and white papers on AI-driven fraud detection and cloud-native payments, reinforcing Visa’s leadership in the fintech space.

Education

• The Catholic University of America

  Master's degree

  2023

• OSM Junior College

  Intermediate

  2015 — 2017

• Lords Institute of Engineering & Technology

  Bachelor of Technology - BTech

  2017 — 2021

• Hyderabd Islamic School

  SSC

  2014 — 2015