Senior Backend Developer – Identity & Vehicle Platform Engineering-Remote

We are seeking a Senior Backend Developer to design implement and refactor core platform services supporting federated authentication and a multi-entity vehicle management system.

This role focuses on integrating Firebase-based identity restructuring backend data models and modernizing API layers to support scalable account vehicle and profile relationships.

Data Model & Persistence Layer Design and implement new domain entities including user_account and vehicle_profile to support federated identity mapping. Refactor existing schemas (e.g.vehicle_enrollment) to separate vehicle-level and profile-level concerns. Develop and execute database migrations including: Table creation column restructuring and foreign key repointing Index updates and performance optimizations Implement data backfill and reconciliation logic for existing records including consolidation of vehicle and profile relationships. API & Middleware Development Refactor REST APIs to support: Account-level vehicle-level and profile-level operations Updated relationships between entities (account-vehicles-profiles) Implement cross-cutting concerns: Request interceptors/filters for authentication and context resolution Shared request context updates (vehicleProfileId userAccountId) Enhance API contracts OpenAPI documentation and error handling to reflect new data model and authentication patterns. Authentication & Security Integration Integrate Firebase Authentication and implement ID-token validation and claim extraction. Transition from client-credential-based authentication (e.g. Keycloak) to federated identity model. Implement account-ownership authorization to enforce access control across account vehicle and profile scopes. Service Layer & Business Logic Rework service logic to support: Vehicle enrollment and profile creation flows Signing key management and rotation Payment/card binding at profile level Update transaction processing logic to distinguish between: Profile-based signed transactions Vehicle-level fallback scenarios Implement account-level operations such as: Full account closure with cascading vehicle unenrollment and partial failure handling Work with third-party integrations including: Firebase (identity provider) MasterCard SRC (card tokenization and identity binding) Payment middleware and BOS systems Ensure consistency of entity mapping across internal services and external callbacks. Testing & Quality Engineering Develop and execute integration and regression test plans across: Updated schema and foreign key relationships API endpoints and authentication flows Update test teardown and data lifecycle logic to reflect new entity relationships. Strong experience in backend development (Java/Spring Boot or similar frameworks) Proven expertise in: REST API design and refactoring Relational database design schema migrations and indexing Authentication/authorization frameworks (JWT OAuth federated identity)