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 Client 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., Client 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