Drivy

Drivy is the startup that is building a better alternative to car ownership. We’re driven by our vision of the economic, social and ecological impact that we can have in cities, and we’re breaking down traditional ideas about mobility. Drivy is already the leading car rental marketplace in Europe. We’re conviced that adoption numers will only continue to increase in the coming years.

It’s an exicting time to be building the website, APIs and native web apps that facilitate this revolution. On this blog, members of the Drivy engineering team share tips, insights and lessons learned during this experience.

Our Tech Stack

Drivy was historically in PHP. Then in 2013, we migrated to Ruby on Rails and we’ve never looked back. We’re currently running Rails 5.1, as well as our native iOS and Android apps. Overall, we value solid quality code, supported with a lot of specs, that can be shipped to production multiple times a day.

We use Rspec, Capybara, Phantomjs and Jest, and integrate our code into CircleCI. We also monitor the production environment closely with dashboards built using Telegraf, InfluxDB and Grafana, just to make sure everything is ticking over nicely. We use Logmatic (an ELK alternative) to parse and analyze our logs, and we check Bugsnag to see if any 500 errors are causing issues for our users.

For our frontend we use ES6 with Babel. We work according to a solid internal styleguide, so that we don’t have to redesign forms and buttons every week. We have a growing set of Preact components for JS-heavy parts of the application. We also use Webpack instead of the classic Rails asset pipeline, and Yarn to manage dependencies.

As far as data is concerned, we use MySQL on RDS with multiple slaves and a dozen Redis instances to store things. We also pull data from multiple sources, then clean them all and update their schemas before they end up in Redshift, our columnar database. We create, schedule and run data pipelines with Apache Airflow, where tasks are written in Python, Ruby or Bash. We make heavy use of Embulk to move data between various datasources — mainly CSV, MySQL, PostgreSQL, Amazon S3 and Redshift. And then we make sense of all this data using Redash for our dashboards and Superset as our drill-down tool.

Processes

We don’t over engineer our processes: we keep workflows and tools simple, like our homemade automated release tool that is connected to Slack to remove headaches, avoid bugs in production and move fast. But we’re also not afraid to challenge these processes regularly, and make additions in order to keep improving things.