Founding AI Product Engineer: Unified LLM API & SDK

Fluency Digital, Inc.; San Francisco (CA); On-site; USD 180,000 - 260,000; Full time

Job summary

Fluency Digital, Inc. in San Francisco is building a unified OpenAI-format API layer that unifies LLM provider integrations and eliminates bespoke glue code.

You will extend the core SDK and API surface, architect Python backend services with FastAPI, shape the TypeScript interface developers touch, and ship infrastructure to route LLM traffic across AWS and Azure. The role requires 5–7 years of engineering experience, fluency in Python/FastAPI, strong TypeScript skills, and hands-on REST API

Qualifications

• 5–7 years building developer tools, SDKs, or API integrations.
• Fluency in Python and FastAPI; strong TypeScript skills.
• Experience wiring REST APIs to cloud infrastructure (AWS/Azure).
• On-site in San Francisco; based in the United States.

Responsibilities

• Extend core SDK and API surface to standardize provider integrations.
• Architect backend systems in Python/FastAPI; shape TypeScript interfaces.
• Ship enterprise-ready infrastructure to route LLM traffic across AWS and Azure.
• Collaborate with a tight, focused team on-site in SF.

Skills

Python

FastAPI

TypeScript

REST APIs

Tools

AWS

Azure

Git

OpenAI

Job description

Fluency Digital, Inc. in San Francisco is building a unified OpenAI-format API layer that unifies LLM provider integrations and eliminates bespoke glue code.

You will extend the core SDK and API surface, architect Python backend services with FastAPI, shape the TypeScript interface developers touch, and ship infrastructure to route LLM traffic across AWS and Azure. The role requires 5–7 years of engineering experience, fluency in Python/FastAPI, strong TypeScript skills, and hands-on REST API