Golang Backend DEV in Microservice Architecture

We need support for our Microservice arch-based Event Ticketing platform. Our current production stack - a ruby monolith is suffering multiple performance lags. We decided to replace it with a different tech-stack: Golang - GRPC - PostgreSQL - GraphQL. That architecture is implemented up to about 30% right now. We need support to speed up our dev-process.

Your task will be:
- implement new functions, participate to our weekly sprints
- write QA tests
- extend existing tests to cover special use cases
- connect our services to 3rd party tools like payment service providers, cash-registry providers and email providers