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.
Job Tags
Full time, Part time,