• Designed and implemented high-performance payment processing APIs using Python (FastAPI, Flask) and PostgreSQL, supporting 100K+ monthly financial transactions with 99.9% system availability.

• Developed React + Redux merchant dashboards providing real-time transaction monitoring, payment settlement tracking, and analytics across Fiserv’s payment platform.

• Improved backend performance by 35% by implementing asynchronous processing with Celery, Redis caching, and optimized SQL queries.

• Built event-driven microservices using Apache Kafka and Python, enabling real-time payment events, settlement processing, and fraud monitoring pipelines.

• Containerized applications using Docker and deployed microservices on Kubernetes clusters to enable scalable, resilient deployments.

• Implemented cloud infrastructure on AWS (EC2, RDS, Lambda, S3) with Terraform for automated infrastructure provisioning.

• Integrated secure authentication and authorization mechanisms (OAuth2, JWT, RBAC) to meet PCI-DSS compliance requirements for financial platforms.

• Built CI/CD pipelines using Jenkins, automating testing, builds, and deployments for faster and more reliable software delivery.

• Improved system reliability by creating 200+ automated test cases using PyTest, reducing production defects by 35%.

• Developed backend services for an e-commerce payment dashboard using Django and Django REST Framework, delivering transaction processing and reporting capabilities for 5,000+ users.

• Designed and implemented RESTful APIs to integrate third-party payment gateways and internal services for transaction processing and order management.

• Optimized PostgreSQL database performance through query tuning, indexing strategies, and ORM optimization, reducing response times by 25%.

• Built API aggregation services integrating 10+ third-party APIs and internal services using asynchronous request handling and message queues.

• Implemented data indexing and search capabilities using Elasticsearch, enabling efficient querying of transaction and order data.

• Collaborated with frontend teams by exposing structured API endpoints and ensuring seamless data integration for dashboard visualizations.

• Established CI/CD pipelines using Git and Jenkins, enabling automated builds, testing, and deployments in Linux-based environments.

• Developed unit and integration tests using PyTest, improving platform reliability and reducing regression defects during releases.