Senior Backend Developer, Global Authentication Service

About the Position

We are looking for a specialist who will support the development of a global authentication and authorisation service used across multiple regions and client facing applications. Standard India office hours, with some flexibility to join some early hours coordinated meetings during Sydney Time zone (AEDT).

About the Project

You will contribute to the development of a global authentication and authorisation service used across multiple regions and client facing applications. The project focuses on delivering secure backend capabilities, identity workflows, and large scale access management.

Responsibilities

• Design and develop backend services that support global authentication and authorisation workflows
• Build secure APIs that manage identity lifecycles, roles, permissions, and claims based access control
• Integrate authentication services with microservices platforms using synchronous and asynchronous communication
• Work with identity and access management systems such as Okta, Auth0, or Keycloak
• Apply secure design practices including encryption, secrets management, and secure configuration in cloud environments
• Maintain data models for identity, configuration, and auditing in SQL and NoSQL databases
• Support multi region and multi tenant deployment considerations for authentication services
• Collaborate with teams to ensure consistent identity standards and service integration

Requirements

• Hands on experience with C Sharp and .NET Core for backend service development
• Experience designing and implementing authentication and authorisation solutions at scale
• Understanding of OAuth 2.0, OpenID Connect, SAML, token based security, and federation patterns
• Experience with identity and access management platforms such as Okta, Auth0, or Keycloak
• Experience building secure APIs and implementing claims based access control
• Familiarity with SQL and NoSQL databases for identity related data
• Awareness of security practices including encryption, secrets handling, and key rotation
• Experience integrating authentication services with microservices architectures
• Ability to communicate clearly in English

Nice to Have

• Unit testing experience
• Strong security mindset in backend development
• Familiarity with travel ecosystem concepts
• Experience collaborating across distributed teams and time zones

Technologies

C Sharp, .NET Core, identity and access management platforms such as Okta, Auth0 or Keycloak, OAuth 2.0, OpenID Connect, SAML, SQL, NoSQL, synchronous APIs, asynchronous events