Felix Tellmann

Lunatag is a React and Node.js-based Shopify application that helps millions of eCommerce merchants to tell a story through pictures. It creates shop-the-look experiences anywhere in users' stores.

I was the principal full-stack developer and had to meet the release timeline and deliver all core features. During the development, I established the algorithm to automatically match and position any image on the user's screen, regardless of the theme's internal setup.

I also developed a secure way to handle user authorization and created a proxy server to handle all route requests so users feel like they are visiting their own Shopify theme editor while being in the app's environment.

A Shopify application that helps merchants set up personalized products by providing file upload functionality for products and orders.

I was the lead developer building most of the application with React, Node.js, AWS S3, and Turborepo. A core feature of the app is that it fully integrates into the merchants' theme editor and can easily be customized to suit any brand guide. The app's back-end side matches Shopify's admin dashboard to ensure that the user experience is frictionless.

A JavaScript and TypeScript-based CLI npm package. The library allows users to efficiently perform API requests to the Shopify admin API via REST or GraphQL with full type safety for all API endpoints.

I developed the open-source library in parallel to a private app where it was essential to have full type safety for all data queried from the API. The package includes all types for each of the REST admin, APIs, and a generator for any GraphQL query and mutation that a simple CLI command can run.

An automotive dealership site with an integrated eCommerce parts store. I was the senior front-end developer for the project, which was designed and developed in three months. I led a team of five, including a Volkswagen project manager and a designer. A core responsibility was to create a vehicle matching algorithm that allows visitors to easily enter their car details and get the exact fitting parts for their model based on the release year, model, and trim.

Another major component of the project was training the Volkswagen employees to manage and maintain the site, adding new vehicles and parts to their product catalog.