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We still build with Ruby in 2025
arted Lago, we picked Ruby on Rails for our core API. The choice was obvious because our founding team had decade of Rails experience.
We started Lago with Rails’ API-only mode, which trims the middleware stack, skips view rendering, and keeps the good stuff: migrations, validations, Active Record, background jobs. We can go from code to production containers without a PaaS tax.- Redis + Sidekiq is battle-tested and highly scalable- We’re starting to implement Ruby Fibers to add asynchronous concurrency- Rails with Puma, autoscaling, and sane caching make the framework extremely scalable. - Performance & memory: Do the wrong things and you’ll pay for it.- Concurrency: CRuby’s Global VM Lock means only one thread runs Ruby code at a time.
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