Hannah Han

SDX Checkout (2024 – Present)

• Led the deprecation of the legacy Ship Option Selection Page (SOSP) by designing a new decision and fallback mechanism that dynamically determines default delivery options and proactively notifies customers, reducing dependency on outdated flows
• Architected and implemented edge-case handling for expired delivery windows, detecting invalid delivery promises in real time and seamlessly redirecting users to standard checkout, improving checkout success rate and reducing customer confusion
• Coordinated cross-team activities to ensure system scalability and readiness for peak events.
• Collaborated cross-functionally with Checkout, DAF, and SSD teams to align delivery promise logic across services and eliminate inconsistencies in fulfillment options
• Developed internal IntelliOps automation to retrieve customer IDs, audit trails, and logs directly from ticketing systems, automatically generating investigation summaries and reducing operational triage time

AWS Bedrock (2022 – 2024)

• Designed and built evaluation frameworks for early Bedrock (formerly “Vector”) generative AI systems, including completion quality evaluation, entity extraction scoring using Java and Python
• Implemented large-scale evaluation workflows for RLHF data collection and reward modeling, enabling systematic comparison of model outputs and improving model quality validation processes
• Engineered Bedrock metering and quota systems integrated with AWS metering services, supporting both provisioned throughput (contract-based) and on-demand (token-based) billing models
• Led onboarding of third-party foundation models (Anthropic, Cohere, AI21, Mistral) onto the Bedrock platform by deploying containerized models, performing security guardrail validation, and executing load testing to determine optimal host configurations
• Expanded model availability to additional AWS regions by coordinating deployment strategies and ensuring platform compatibility and scalability

Prime Video (2021 – 2022)

• Analyzed and processed large-scale customer clickstream data to build device-specific journey analysis pipelines, filtering noisy signals and enabling more accurate user behavior insights
• Redesigned Prime Video front-end content presentation from vertical layouts to carousel-based UI components, improving content discoverability and modernizing the browsing experience
• Introduced new cache-related integration test coverage for services that previously lacked automated validation, improving deployment confidence and reducing regression risks
• Developed an abnormality detection pipeline for video catalog ingestion using AWS CloudWatch and EventBridge, enabling faster detection of data anomalies during large-scale content imports

• Analyzed and translated complex client business requirements into technical system designs through stakeholder workshops and cross-team collaboration, ensuring alignment with client needs.
• Designed digital asset management workflows (create → review → approve → publish) to support enterprise content governance and lifecycle control
• Implemented SSO and enterprise authorization integrations to align client identity systems with application access control
• Engineered bulk import mechanisms to handle large-scale media uploads, reducing timeouts and significantly improving ingestion reliability for high-resolution assets
• Built bulk editing capabilities for campaign assets, streamlining updates for large collections of media and minimizing manual operations.
• Mentored junior developers in coding best practices and problem-solving techniques, enhancing team skill set and fostering knowledge sharing.
• Utilized version control tools to manage source codes across multiple projects.

• Implemented RESTful APIs for seamless data integration between front-end and back-end systems.
• Developed e-commerce web applications for retail clients using PHP and Laravel, implementing essential features like product search, quick shop, and streamlined checkout flows
• Integrated third-party APIs, including PayPal payment processing with asynchronous AJAX workflows, enhancing checkout flexibility and user experience
• Built responsive UI components with HTML5, CSS3, Bootstrap, and JavaScript, ensuring compatibility across modern browsers
• Collaborated with designers and project managers to translate business requirements into functional web features

• Implemented front-end components that allowed users to search, track, and manage stock portfolios within single-page application, improving accessibility and usability
• Developed responsive UI pages for internal web-based trading platform using AngularJS, HTML5, CSS3, and Bootstrap to enhance user experience
• Collaborated in requirements discussions and conducted peer code reviews to align with product and engineering standards, ensuring quality and consistency