Make Oswaldo Ferreira (@oswaldo) a backend maintainer

Overview

• Works at GitLab since Jan 2017:
  • Discussion team (now devopsplan)
  • devopscreate and groupsource code
  • helped ~"group::fulfillment" in https://gitlab.com/gitlab-org/customers-gitlab-com features. Where have been a maintainer for about 2 years (and got out of the role just recently !49536 (merged), when the team already had enough maintainers)
  • Currently working at Scalability team for about 4 months.
• Authored at least 404 merge requests

Most relevant reviews

• Moving MR mergeability checking to async
• Capturing diff discussions positioning
• Improvements on diff caching
• Leak prevention

I've been adding most (but not all) to #5349 (closed).

WDYT @gitlab-org/maintainers/rails-backend?