Senior AI Solutions Architect - Cloud & Gateway APIs

Quantiphi; Charlotte (NC); On-site; USD 140,000 - 180,000; Full time

Job summary

Quantiphi is seeking a senior backend engineer to design and implement gateway APIs that connect Google CXAS agents to enterprise applications. You will build an external state engine, enforce business rules, and ensure secure, scalable operation across cloud services.

The role emphasizes distributed systems, API governance, and robust testing, with a focus on Python/Java backends, OpenAPI and workflow orchestration in a Google Cloud environment.

Qualifications

• Strong backend development in Python/Java, with FastAPI or similar frameworks.
• Experience with REST APIs, OpenAPI and JSON Schema for typed requests/responses.
• Practical knowledge of workflow engines or finite-state machines.

Responsibilities

• Design and implement Gateway APIs for Google CXAS, including sessions, journey resolution, and state transitions.
• Implement an external state engine covering journey, active state, required information, pending actions and completion status.
• Define versioned journey configurations, transition rules, policies and state-specific response guidance.
• Ensure Gateway validates actions against current state, identity, authorization and business rules.
• Implement timeouts, retries, idempotency, concurrency controls and recovery from partial failures.
• Persist session state and audit records with proper isolation and data protection.
• Implement authentication, authorization, secrets management and service-to-service security.
• Provide correlated traces showing request, policy decision, state changes, backend operation and response.
• Integrate automated tests and AgentCert evidence into the workflow.
• Package and deploy services to the Google Cloud environment, including Cloud Run where selected.
• Produce API documentation, architecture decisions, runbooks and handover material.

Skills

Python

Java

FastAPI

REST APIs

OpenAPI

JSON Schema

Workflow engines

Tools

Google Cloud

IAM

Docker

Kubernetes

CI/CD

Job description

Quantiphi is seeking a senior backend engineer to design and implement gateway APIs that connect Google CXAS agents to enterprise applications. You will build an external state engine, enforce business rules, and ensure secure, scalable operation across cloud services.

The role emphasizes distributed systems, API governance, and robust testing, with a focus on Python/Java backends, OpenAPI and workflow orchestration in a Google Cloud environment.