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Using this search engine (with Ruby/Rails gem) and am very happy. Performance is blazing fast.

I really love Sinatra simplicity to start new web services, it's a really smooth and easy process! I also use it currently in production. It makes a lot of sense (from a performance POV) for APIs and Proxies. But if you're going to build a more complex web app, with views, forms, mails, interactions, ... I'd just start with Rails.

It does the work : )

I've been building Rails apps for more than 10 years and I feel like I have superpowers now 💪 No, seriously. Building web-apps with Rails makes you really productive.

The latest major version, Rails 7, also simplified the front-end part, which makes super easy to use modern/ES6 stuff, even without Node and a the extra build step.

The best gem for authentication. Very easy to add and extend if needed. For stronger security, you can easily integrate it with https://github.com/phatworx/devise_security_extension

The most complete geocoding solution for Ruby and Rails apps. You can configure different lookup services and databases. It also provides some useful methods like "near".