Job Description

🚀 Senior Full-Stack Engineer High-Growth AI SaaS Startup

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

💰 Salary: $200K$300K + Meaningful Equity (1%+)

Join an early-stage AI SaaS startup building an application builder that empowers business users to create custom applications where humans and AI collaborate seamlessly across enterprise workflows. Youll play a pivotal role in shaping core architecture, product development, and first production deployments , working directly with the founder and early team.

About the Role

Were seeking a Senior Full-Stack Engineer to lead product development and own major product surfaces across frontend, backend, and integration layers . This is a high-impact role where youll directly influence product direction and help build the foundation for Lumenas platform.

What Youll Do

• Design and build the core application builder the orchestration layer connecting workflows, agents, and front-end views.
• Develop and scale Lumenas TypeScript-based backend and modern frontend stack ( React + Tailwind ).
• Build dynamic frontend interfaces for dashboards, forms, and human-AI workflows.
• Collaborate with the applied engineering team to integrate automation and intelligence across systems.
• Shape and maintain the integration layer connecting REST APIs, SQL sources, and third-party systems.
• Define and enforce best practices for product engineering, architecture, and developer experience as the company scales.

Who You Are (Must-Haves)

• 515 years of professional software engineering experience in full-stack development.
• Prior experience working in early-stage startups or high-growth environments.
• Strong proficiency with TypeScript, Node.js , and modern frontend frameworks ( React , Tailwind ).
• Experience designing complex architectures , asynchronous workflows, and integrations.
• Excellent problem-solving, collaboration, and communication skills.

Nice-to-Haves

• Experience building or integrating AI / LLM-powered applications .
• Familiarity with orchestration/workflow frameworks such as Temporal .
• Exposure to cloud platforms (AWS/GCP/Azure), containerisation, Kubernetes, and CI/CD pipelines.
• Experience with enterprise-grade concerns: secure hosting (VPCs), observability, identity & compliance.

Why Join?

• Competitive salary: $200K$300K + meaningful equity (1%+) in an early-stage company.
• Work directly with experienced founders and influence the product roadmap.
• Shape the architecture and direction of a high-impact platform powering first production deployments.
• Be part of a small, agile, highly motivated team at the forefront of AI and enterprise applications.

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