Sascha Mayr

A dashboard of the most popular cryptocurrencies that shows buy/sell signals depending on the SuperTrend trendline. The dashboard can be used to find good trading opportunities and improve portfolio health.

I developed the project from scratch using Next.js. I also used CoinGecko and Cryptowatch APIs to get OHLC data and calculate the SuperTrend.

A Next.js, Koa, and React-based app in the Shopify App Store. I developed it from scratch with my business partner, working on the admin dashboard (including an analytics dashboard), the storefront, and the Koa and Next.js server.

We used a web component to display the upsell-dialog consistently across the admin dashboard and the storefront (there is no React available there). We stuck with GraphQL wherever possible to increase performance and leveraged Shopify's webhooks where appropriate to get notified of changes on their side (billing, app uninstall, and GDPR requests).

A Rails-based website I developed from scratch, intended for travelers who want to find out if they can drink the water in a particular place or country in the world. The data is scraped from multiple websites that contain part of the information (Numbeo, NationMaster, Lonely Planet, and washdata.org (JMP)) and merged in the back end.

The start page features a single autocomplete field to get users quickly to the place they want to find out more about. All page navigation is done via Turbolinks. One special page shows a world map (via Leaflet) with country data on hover. Another special page provides a calculator to calculate potential water savings from drinking tap water and defaults to your location via reverse-IP lookup.

I created my homepage with Create React App that features a Markdown-style listing (via highlight.js) of my professional and personal projects, uses webpack, and is hosted on Netlify.

I wrote a custom hook, "useDarkMode," that helps switch between the light and dark mode. It defaults to system default and remembers the user's choice via local storage.