- started/scaled infrastructure for third-party marketplace integration, coordinating the synchronization of hundreds of millions of SKUs across multiple platforms- did server-side optimization for the product designer (single-page application) that reduced database load and dropped TTFB by over 50%- built our power user tier system that delivered dynamic volume-based pricing to sellers (started off as a summer project that grew into a full-fledged feature)- combined our 2 single-page applications (each for launching different product types) into one unified product designer with modern front-end technology (React/Redux/ES6)- refactored legacy fulfillment systems, cutting the number of steps to launch products globally in half- implemented customized in-house solution for specific problems we had during online schema migrations- implemented the re-design of the entire homepage- played a crucial role in our hiring process, interviewing engineers ranging from junior software engineers to engineering managers

- developed a native android application from scratch