Senior Backend Developer

Role Summary

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.

Key Responsibilities

1. 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:

o   Table creation, column restructuring, and foreign key repointing

o   Index updates and performance optimizations

·       Implement data backfill and reconciliation logic for existing records, including consolidation of vehicle and profile relationships.

2. API & Middleware Development

·       Refactor REST APIs to support:

o   Account-level, vehicle-level, and profile-level operations

o   Updated relationships between entities (account → vehicles → profiles)

·       Implement cross-cutting concerns:

o   Request interceptors/filters for authentication and context resolution

o   Shared request context updates (vehicleProfileId, userAccountId)

·       Enhance API contracts, OpenAPI documentation, and error handling to reflect new data model and authentication patterns.

3. 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.

4. Service Layer & Business Logic

·       Rework service logic to support:

o   Vehicle enrollment and profile creation flows

o   Signing key management and rotation

o   Payment/card binding at profile level

·       Update transaction processing logic to distinguish between:

o   Profile-based signed transactions

o   Vehicle-level fallback scenarios

·       Implement account-level operations such as:

o   Full account closure with cascading vehicle unenrollment and partial failure handling

5. Integration & External Systems

·       Work with third-party integrations including:

o   Firebase (identity provider)

o   MasterCard SRC (card tokenization and identity binding)

o   Payment middleware and BOS systems

·       Ensure consistency of entity mapping across internal services and external callbacks.

6. Testing & Quality Engineering

·       Develop and execute integration and regression test plans across:

o   Updated schema and foreign key relationships

o   API endpoints and authentication flows

·       Update test teardown and data lifecycle logic to reflect new entity relationships.

Required Qualifications

·       Strong experience in backend development (Java/Spring Boot or similar frameworks)

·       Proven expertise in:

o   REST API design and refactoring

o   Relational database design, schema migrations, and indexing

o   Authentication/authorization frameworks (JWT, OAuth, federated identity)

·       Experience implementing middleware components such as interceptors, filters, and request contexts

·       Familiarity with cloud-based identity providers (e.g., Firebase Auth, OAuth providers)

Preferred Qualifications

·       Experience with payment systems and tokenization (e.g., MasterCard SRC or similar)

·       Prior work on multi-tenant or hierarchical data models (account → asset → profile)

·       Knowledge of event-driven integrations and callback-based third-party systems

·       Experience with API gateways and distributed security validation patterns

Key Competencies

·       Strong system design and data modeling skills

·       Ability to manage complex refactoring across multiple layers (DB, API, service)

·       Attention to data integrity, security, and backward compatibility

·       Effective collaboration across architecture, QA, and integration teams

Scope & Impact

·       End-to-end ownership of a major platform refactor spanning:

o   Data model redesign

o   Authentication transformation

o   API and service re-architecture

·       Direct impact on enabling scalable, multi-vehicle, multi-profile user experiences

·       Critical role in aligning platform architecture with federated identity standards and payment constraints