Matthis Shah worked on the openfga/openfga and openfga/openfga.dev repositories, focusing on backend development and database scalability. He implemented support for separate read and write datastores in PostgreSQL, introducing new configuration options and internal logic to optimize data access patterns. Additionally, he enabled PostgreSQL read replica support, allowing distribution of read operations across primary and secondary datastores with configurable replication modes and read consistency. Using Go, SQL, and configuration management skills, Matthis updated documentation and setup guidance to reflect these changes, reducing onboarding complexity and operational risk. The work demonstrated depth in distributed systems and performance optimization.