Design, build, and maintain a high-scale Ruby API using Rails/Sinatra. Write well-factored, tested code (RSpec, TDD/BDD), support AWS infrastructure (Terraform), debug production with Airbrake/Datadog/CloudWatch, mentor distributed engineers, and participate in heavy pair-programming across timezones.

Run and modernize AWS-hosted infrastructure for high-traffic Ruby APIs. Implement Terraform, Docker, and Kubernetes deployments; write and maintain well-tested Ruby/Rails/Sinatra code with RSpec and TDD/BDD; mentor distributed engineers; participate in heavy pair-programming and timezone-aligned collaboration.