Senior Full-Stack Engineer - AI Application Development

Join an Innovative AI SaaS Startup as a Senior Full-Stack Engineer

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

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

Be part of a pioneering AI SaaS startup focused on creating an application builder that enhances collaboration between business users and AI across enterprise workflows. In this crucial role, you will influence core architecture , drive product development , and support the first production deployments while working closely with the founder and the early team.

About the Role

We are looking for a Senior Full-Stack Engineer to guide product development and take ownership of significant product features across the frontend, backend, and integration layers . Your contributions will directly impact the product's trajectory and lay the groundwork for Lumena's platform.

What You'll Do

• Design and implement the core application builder , serving as the orchestration layer that connects workflows, agents, and front-end views.
• Develop and enhance Lumena's TypeScript-based backend and modern frontend stack ( React + Tailwind ).
• Create dynamic frontend interfaces for dashboards, forms, and workflows that combine human and AI inputs.
• Work alongside the applied engineering team to embed automation and intelligence across various systems.
• Shape and sustain the integration layer that links REST APIs, SQL databases, and third-party services.
• Establish and uphold best practices in product engineering, architecture, and developer experience as the company grows.

Who You Are (Must-Haves)

Nice-to-Haves

Why Join Us?