• Part of the Cashiering Service Team, which oversees a service utilized for checkout flow. The service currentlyintegrates multiple gateways that support Braintree, Paypal, ACH, card, terminal, and gift card flow. It facili-tates payments, refunds, and manages related gateway settings. A payment facilitator with account management,payouts, fee management, refund settings, and related reporting has been developed.• Responsible for end-to-end components of 3 subsystems (payment gateways), including design, coding, testing,integration, deployment, and enhancements.• Tech Stack: Spring Boot, Java 8/11, Kafka, Elastic Search, Sumo Logic, Redis, Postman, Documentation,LaTeX, MongoDB• Improved average latency of 3 existing APIs by over 30• Optimized storage by 150GB through changes in API contracts, API aggregation, and existing system design toreduce redundancy.• Refactored over 500 lines of code.• Part of the CI team, implemented sonar lint before commit, and stress tested by intentionally writing incorrectcode to reduce edge cases.• Mentored and guided 2 junior interns• Collaborated with cross-functional teams including management, product, QA, and UI/UX teams, effectivelycommunicating and coordinating to ensure successful project delivery.• Gained experienced in working fast-paced startup environment, consistently delivering high-quality work ontime, and adapting to ad-hoc requirements and priorities.