Full-Stack Engineer for AI Agent Platform & Billing

Jack & Jill; San Francisco (CA); On-site; USD 170,000 - 230,000; Full time

Job summary

Jack & Jill is seeking an Architect to lead the core machinery for AI agent production in San Francisco. You will design systems for real-time model routing and high-scale billing ledgers, ensuring reliability in high-stakes environments and a smooth developer experience.

You will develop the control plane for agent authority and credential-scoped permissions to keep autonomous operations safe while enabling rapid iteration and scalable growth.

Qualifications

• 4–7 years of experience owning production systems, especially in payments or financial ledgers.
• Proven ability to design for failure in distributed systems.
• Full-stack mindset with experience building user interfaces.

Responsibilities

• Architect core infra for AI agent production, including real-time model routing.
• Build high-scale billing ledgers and related financial components.
• Develop the control plane for agent authority and credentials.
• Design credential-scoped permissions ensuring safe autonomous operations.

Skills

Full Stack Development

Distributed Systems

System Architecture

Billing Systems

Payment Ledgers

Real-time Routing

API Design

Idempotency

Error Handling

Credential Management

Infrastructure Engineering

Backend Development

Frontend Development

Job description

Jack & Jill is seeking an Architect to lead the core machinery for AI agent production in San Francisco. You will design systems for real-time model routing and high-scale billing ledgers, ensuring reliability in high-stakes environments and a smooth developer experience.

You will develop the control plane for agent authority and credential-scoped permissions to keep autonomous operations safe while enabling rapid iteration and scalable growth.