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Full-Stack AI Engineer
Crossfill
Software Engineering, Data Science
Mountain View, CA, USA
Posted on Mar 31, 2026
About Crossfill
The way people shop online is changing. Instead of browsing endless product pages, shoppers are increasingly using AI assistants to discover what they want. Crossfill is building the platform that helps brands thrive in this AI-first world by optimizing their digital presence for AI-driven discovery.
We’re a fast-growing, venture-backed startup building at the intersection of AI, data, and user experience.
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About the Role
We’re looking for a Full-Stack AI Engineer to help design and build the core of our AI-powered platform. This role spans frontend product development, backend systems, cloud infrastructure, and applied AI.
You’ll work end-to-end—from crafting intuitive product experiences to building scalable services and agentic AI workflows powered by large language models. This is a high-ownership role with real impact on both product direction and technical architecture.
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What You’ll Do
Frontend
- Build and ship core product features using Next.js and TypeScript
- Design intuitive, high-quality interfaces for complex, data-heavy workflows
- Develop fast, scalable data visualizations across large, multi-source datasets
- Collaborate closely with product, design, and engineering teams
Backend & AI Systems
- Build and scale backend services, APIs, and integrations using Python (FastAPI) and PostgreSQL
- Own cloud infrastructure on GCP, including GKE, GCS, and related services
- Ensure systems are reliable, observable, and performant as usage scales
- Design and improve prompting, retrieval, evaluation systems, and agentic AI workflows for production LLM use
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What We’re Looking For
- Experience shipping production-grade web applications and backend systems
- Strong skills in TypeScript and Python
- Comfort working across frontend, backend, and infrastructure
- Experience with LLMs, NLP, or generative AI systems, and understanding their tradeoffs
- Ability to work independently, take ownership, and thrive in a fast-moving startup
- Experience with GCP and Kubernetes is a strong plus
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Why You’ll Love Working Here
- Competitive base salary
- Performance-based bonuses
- Early-stage equity
- High ownership and real influence on product and architecture
- Work on meaningful AI products used by real customers
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Our Values
Crossfill is committed to building a diverse and inclusive workplace. We are an equal opportunity employer and do not discriminate based on race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or any other legally protected status.