EXCEEDS logo
Exceeds
Mack XU

PROFILE

Mack Xu

Over seven months, contributed to the bigcommerce/checkout-js and checkout-sdk-js repositories by building and refining checkout features focused on shipping, discounts, and user experience. Developed multi-shipping UX enhancements, digital item messaging, and a consignment discount system, emphasizing type safety and maintainability using TypeScript and React. Improved error handling for empty carts and clarified authentication flows, while also extending interfaces to support dynamic shipping costs. Enhanced CI/CD processes through CircleCI configuration updates and ensured consistent discounted shipping cost handling across frontend and backend. The work demonstrated a disciplined approach to software architecture, interface design, and testing, supporting reliable and scalable checkout experiences.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

19Total
Bugs
2
Commits
19
Features
10
Lines of code
368,975
Activity Months7

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026 highlights focusing on Consignment Interface enhancements in the checkout-sdk-js to enable accurate shipping cost calculations at checkout. This work improves pricing accuracy, checkout reliability, and lays groundwork for dynamic cost models across the business.

February 2026

3 Commits • 3 Features

Feb 1, 2026

February 2026 monthly summary: Delivered customer-visible shipping savings improvements and backend readiness for discounted costs, complemented by CI/CD enhancements to accelerate delivery. Key features delivered include Cart Shipping Discounts Display on the cart page and Discounted Shipping Cost Support in the checkout SDK, along with CircleCI cleanup to streamline builds and tests. These efforts improved price transparency for shoppers, enabled accurate shipping cost handling after discounts, and reduced cycle times for deployments. Technologies demonstrated include frontend UI updates (React/HTML/CSS), TypeScript interface extension, and CircleCI configuration. Overall impact: enhanced conversion through clear savings messaging, consistent discounted shipping cost handling across frontend and API layers, and faster, more reliable release processes.

December 2025

1 Commits

Dec 1, 2025

December 2025: Stabilized the checkout experience in bigcommerce/checkout-sdk-js by implementing robust empty-cart handling on the update checkout endpoint. Delivered a targeted bug fix that prevents broken checkout flows when the cart is empty and provides clear user feedback. This reduces cart abandonment risk and supports smoother deployments. Technologies/skills demonstrated include TypeScript/JavaScript, API integration, error handling, and UX messaging improvements.

April 2025

2 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary for bigcommerce/checkout-sdk-js focused on delivering measurable improvements to the checkout flow and user experience. The work centered on clarifying authentication redirect behavior and providing a direct logout path during checkout, paired with disciplined commits to improve maintainability and clarity.

March 2025

4 Commits • 1 Features

Mar 1, 2025

March 2025: Delivered the Consignment Discount System for Checkout in bigcommerce/checkout-sdk-js. Implemented a new, type-safe discount interface for consignment discounts (automatic and coupon-based) along with a dedicated OrderShippingConsignmentDiscount interface to enable shipping discounts. Migrated discount types to fixed string literals and introduced generic interfaces for discount types to improve reliability, maintainability, and testability. This work reduces risk of discount misapplication, enhances checkout UX, and provides a scalable foundation for future discount features and shipping-related promotions.

November 2024

6 Commits • 3 Features

Nov 1, 2024

Monthly work summary for 2024-11 focusing on key accomplishments, features delivered, major fixes, and impact across the bigcommerce/checkout-js repo.

October 2024

2 Commits • 1 Features

Oct 1, 2024

October 2024: Delivered multi-shipping UX enhancements in bigcommerce/checkout-js, focusing on user guidance and shipping control. Implemented an items-left banner with localization support and enabled deleting a consignment in the checkout flow. No major bugs fixed in this period for the repository. Resulting improvements include clearer allocation flow, reduced risk of mis-ships, and localization-ready UX for global customers. Commits included two feature iterations: feat(checkout): CHECKOUT-8598 Display Items Allocated Banner and feat(checkout): CHECKOUT-8777 Delete a consignment.

Activity

Loading activity data...

Quality Metrics

Correctness96.8%
Maintainability91.6%
Architecture92.6%
Performance91.6%
AI Usage21.0%

Skills & Technologies

Programming Languages

HTMLJSONJavaScriptSCSSTypeScriptYAML

Technical Skills

API developmentComponent ArchitectureConfiguration ManagementContinuous IntegrationDevOpsFront End DevelopmentHTMLReactSoftware DesignType SafetyTypeScriptUI/UX DesignUI/UX designbackend developmenterror handling

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

bigcommerce/checkout-sdk-js

Mar 2025 Mar 2026
5 Months active

Languages Used

TypeScriptJSONYAML

Technical Skills

API developmentSoftware DesignType SafetyTypeScriptfull stack developmentgeneric programming

bigcommerce/checkout-js

Oct 2024 Nov 2024
2 Months active

Languages Used

JavaScriptSCSSTypeScript

Technical Skills

Reactfront end developmenttestingComponent ArchitectureFront End DevelopmentTypeScript

bigcommerce/cornerstone

Feb 2026 Feb 2026
1 Month active

Languages Used

HTML

Technical Skills

HTMLfront end developmenttemplate rendering