Technologies we use: Ruby on Rails, Python (Flask, FastAPI), React, native iOS (Swift, SwiftUI), native Android (Kotlin), PostgreSQL, GraphQL, AWS (RDS, SQS), Docker, Kubernetes, GitLab, Datadog, PagerDuty. Currently shipping, or recently shipping, production code in at least one layer of our stack (backend (Ruby, Python, ), web frontends (React), iOS, or Android,) with enough range to follow the conversation in the others and review architecture decisions critically.