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Senior Full Stack Engineer (Product) - AI Workflow/Application Builder (Sonoma)
Senior Full Stack Engineer (Product) - AI Workflow/Application Builder (Sonoma)Ikuto • Sonoma, CA, United States
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Senior Full Stack Engineer (Product) - AI Workflow / Application Builder (Sonoma)

Senior Full Stack Engineer (Product) - AI Workflow / Application Builder (Sonoma)

Ikuto • Sonoma, CA, United States
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  • [job_card.full_time]
[job_card.job_description]

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

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

💰 Salary : $200K$325K + 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)

  • 415 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$325K + 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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