Over the years I believe I developed a strong ability to get up and running on new/existing projects very fast. Also, having products (and paying clients) myself means I understand what drives a business and can often find solutions that were not envisioned by other members of the project.
Examples of things I've done in the past:
Revamping AWS infrastructure for a company offering a SaaS, reducing AWS bill from $15k to $2.5k. And at the same time, getting them a nice platform and continuous integration system to build, test, deploy, and monitor their services.
Migrating a large (and critical) RubyOnRails project from Rails2.x/Ruby1.8 to Rails4.x/Ruby2.x, adding a strong test suite and CI pipeline to ensure the main features were working with the new stack as we went over the numerous changes required to upgrade.
Setup of CI/CD systems.
Setup of infrastructure provisioning with Puppet.
Migrating applications to docker, and everything that goes with it.
Writing tests, both as blackbox tests against legacy systems to prepare for a migration, and unit/integration/system tests.
Advising and implementing Single Sign On solutions.
ElasticSearch interactions (indexing, aggregations, reporting).
Greenfield RubyOnRails projects (obviously).
I'm preferably working remotely, but for larger projects I will generally travel to meet your team at the beginning of the contract. I can also work on site if you're based in the region of Rennes, France.