Sejin Hwang

Hybrid Full Stack Engineer at MasterCard Inc.

Owned development and delivery of responsive, high-performance web applications with strong SEO, accessibility, and user engagement. Collaborated with design and product teams to architect scalable, user-centric interfaces aligned with business goals. Led a full website redesign from planning to launch, modernizing UI, improving scalability, and achieving a 30% increase in traffic through SEO and performance improvements. Optimized performance by improving database queries, implementing caching, and reducing service response times by 25%. Offloaded media assets to AWS S3 to reduce server strain and improve page load speed. Developed and maintained data pipelines integrating Adobe Analytics, Marketo, and internal web data for marketing reporting. Automated data extraction, transformation, and validation processes using Python and SQL, ensuring consistent, reliable reporting. Partnered with marketing and product teams to create dashboards and reports that improved campaign performance vi