Pavel Savinski developed a secure machine-to-machine authentication flow for the alcosi/twins repository, focusing on service-to-service communication within internal microservices. He replaced a generic login with an OAuth2 client credentials flow, enabling backend services to authenticate directly via API integration. To improve reliability, he enhanced token introspection by adding a fallback from the 'sub' to the 'client_id' claim in JWTs, ensuring robust identification of M2M clients. Working primarily in Java and leveraging OAuth2/OIDC standards, Pavel established a strong security baseline that prepares the Twins platform for scalable onboarding of additional services. The work demonstrates depth in authentication and backend development.