* Created an RESTful API endpoint with end-to-end test coverage on the Ruby on Rails server.

* Implemented an asynchronous job in Ruby for tracking users involved in A/B tests.

* Refactored account reactivation flow into a standalone JavaScript service.

* Implemented and maintained JavaScript web-components for the QuickBooks Online UI component library.

* Performed 20+ JavaScript code reviews for contractors and external contributors to the project.

* Refactored the rendering logic for five UI components to make them compatible with React.js wrappers.

* Implemented a new user role and permissions for that role in the recipe admin tool (JavaScript and Ruby) to improve workflow for 6 recipe writers.

* Implemented a document mutex with user-specified expiration dates to prevent concurrent edits.

* Produced 5 data and schema migrations for the new features.