Rezwan

Software Engineer

US

Apr 2022 - Present • 4 yrs 6 mos

Designed and developed scalable backend systems using Java, Spring Boot, and PostgreSQL for enterprise payment and airlineoperations platforms.• Architected and developed a distributed payment aggregator platform, handling end-to-end card and MFS transactionprocessing with secure, high-concurrency workflows.• Implemented secure payment features including OTP verification, transaction validation, PCI DSS-aligned encryption,idempotency using Redis distributed locking, and automated reconciliation using Kafka Streams.• Designed and implemented backend services for a mission-critical Airline Operations Platform covering Flight Operations, CrewScheduling, Crew Training, and Crew Pick & Drop modules.• Developed complex airline business workflows including flight publication, disruption management, aircraft changes, crewassignment, training management, and Journey Log processing.• Designed database schemas, indexing strategies, and transactional workflows for large-scale operational systems requiring highdata integrity and regulatory compliance.• Built secure REST APIs protected by JWT authentication and Role-Based Access Control (RBAC), integrating with API Gatewayand multiple backend services.• Developed asynchronous event-driven workflows using RabbitMQ and Kafka to synchronize notifications, operational events,and inter-service communication.• Collaborated closely with airline Operations Control Center (OCC), Crew Scheduling, and Training teams to translate complexoperational workflows and aviation regulations into scalable backend solutions.• Diagnosed production issues, optimized database performance, reviewed code, and mentored developers while maintaininghigh code quality and system reliability.