Backend Development
Ruby on Rails the technology of my choice regarding web app development. It is a mature framework with a great community that enables fast development and ties everything together, from building the prototype to the final product.
For machine learning applications Python is the natural choice. Many solid libraries from the fields of statistics, math and AI algorithms already exist and are ready to be used for your next app.
When extra performance is needed, GO is the language to... ähhh... go. It is simple, a snap to deploy, blazingly fast, has a big community behind it and a funny logo - what more can you ask?
Most apps need a database, there are many databases that do one thing great, PostgreSql is up to any task from full text search to storage of complex structures. From scaling to backups it is a well thought out open source project.
Frontend Development
For frontend the choice of the right technology can save a lot of time. Depending on the interactivity of the app everything from vanilla JS to full blown single page app is possible. For that I use React.js, maybe together with Redux and Typescript. Connecting the backend can be done with a classic REST api, maybe with OpenApi specification, or with GraphQL.
CSS is a powerful language that keeps evolving - variables, flex box and grid make complex layouts easier to achieve. With SCSS it becomes even more powerful and faster to write.
Infrastructure
Last but not least the carefully crafted app needs to live somewhere. I use Capistrano for deployment, Ubuntu as server, Chef for server management and Docker.
Other
Sometimes I build apps for iOS and macOS with Swift and Objective-C. I also build Audio Apps as a hobby, for example the chromatic tuner LunaTuna and the macOS system equalizer Vizzdom.
