Senior Back End Engineer - AI Workflow / Application Builder

🚀 Senior Backend Engineer – AI Application Builder

📍 SoMa, San Francisco, CA | 💼 Full-Time | Onsite

💰 Salary : $200K–$325K + Meaningful Equity (1%+)

Join an early-stage AI SaaS start-up creating an application builder that empowers business users to build custom applications where humans and AI collaborate seamlessly across enterprise systems. The company addresses complex enterprise challenges, including multi-day workflows, cross-system integrations (ERP / CRM / financial platforms), secure VPC hosting, and enterprise-grade observability, logging, identity, and compliance controls.

About the Role

We’re looking for a Backend Engineer to lead the development of backend systems and architecture. This is a rare opportunity to take ownership of core systems in an early-stage company, shaping architecture, scalability, and reliability from the ground up.

You’ll tackle challenging problems like orchestrating multi-system workflows, processing large-scale data asynchronously, and safely executing AI-generated code — all while collaborating closely with the applied AI team.

What You’ll Do

• Design and build the core workflow engine — the orchestration layer connecting agents, data sources, and frontend views.
• Develop and scale the TypeScript-based backend , handling asynchronous execution, retries, and deterministic routines.
• Build and maintain integration layers for REST APIs, SQL sources, and third-party systems.
• Collaborate with the applied AI engineering team to integrate automation and intelligence across systems.
• Define and enforce best practices for backend architecture, reliability, and developer experience as the company scales.

Who You Are (Must-Haves)

Nice-to-Haves

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