Gift Card Order Fulfillment and Inventory Management · Full-Stack Development

- A mobile-first platform designed to facilitate the donation of unwanted items to the community• Developed a real-time, data-persistent chat functionality using PostgreSQL and Socket.io, aimed at improving server-client communication with minimal overhead. This feature supports efficient message exchanges, enhancing user experience. Utilized React Hooks and Context for state management, improving component reusability and the efficiency of message displays.• Developed a filtering algorithm that dynamically adjusts data presentation based on sorting criteria and keyword searches. This integration of map, search, and filter functionalities aids users in efficiently locating desired items.• Applied mobile-friendly designs to the homepage, item listings, filters, searches, and chat interfaces using Bootstrap and Material-UI. This ensures a consistent user experience across different mobile devices.• Collaborated with a team of 8 engineers to review and adjust a client’s business proposal within a tight deadline. Employing agile methodologies facilitated effective teamwork and project management.

- A microservice architecture RESTful API to replace the legacy monolithic application• Optimized query performance of a 7 million records database by identifying a database bottleneck with query planner and refactoring the expensive nested filter clause and reducing latency from 20s to 21ms.• Enhanced server capability to efficiently manage 10,000 request per second while maintaining an error rate below 1% by horizontally scaling microservice to 5 AWS instances.• Improved fault tolerance and system availability by horizontally scaling both the proxy and service layers using NGINX load balancers, ensuring more robust system reliability and user accessibility under varying load conditions.• Decreased stress testing cycle length by diagnosing and resolving system bottlenecks using New Relic, K6, and Loader.io.

- User interface for product overview widget of a single page e-commerce web application• Leveraged React Hooks and Context to reduce the complexity of state management and allow for greater reusability within and between components.• Utilized React, CSS grid, and flexbox to create a responsive, accessible, and mobile-friendly user interface for the related products component of an e-commerce web application.• Architected a React front-end service of photo carousel and pop-up modal.• Enforced Test-Driven Development by configuring a testing environment with Jest to achieve 70% test coverage.

• Developed an automated rate-lock tracking and notification application utilizing Python and the Encompass loan origination platform, achieving accuracy and efficiency rate of over 99%.• Conducted pricing and margin analyses using the mortgage platforms Optimal Blue and Encompass, along with Excel, to meet the needs for lending rate adjustments and margin concessions, ensuring competitive and fair lending practices.• Collaborated with various branches and departments to address rate-lock-related challenges, processing an average lending volume of 360 million per month.