Founding AI-Native Product Builder for B2B SaaS

Thorin; San Francisco (CA); On-site; USD 140,000 - 180,000; Full time

Benefits offered by this job

100% employer-paid medical, dental, &

401(k)

Wellness stipend

Transportation stipend

Lunch stipend

Coffee & snacks stipend

Developer tools budget

Prime SF office on Market Street

Weekly team dinners

Job summary

Thorin is seeking a Founding Technical Product Builder to bridge customers, engineering, and founders. You will identify valuable problems, prototype AI-native solutions, and ship products with a focus on AI agents, LLMs, and retrieval workflows.

This is ideal for a founder, founding PM, Product Engineer, or deeply technical PM who thrives in ambiguity and loves building AI-native products. You’ll influence architecture, tradeoffs, and success metrics from the start, shaping Thorin’s product

Qualifications

• 6–15 years building technical B2B SaaS products.
• Founder, Founding PM, First PM, Product Engineer, or early startup operator strongly preferred.
• Strong technical credibility; ideally Computer Science or similar engineering background.
• Experience with LLMs, agents, RAG, retrieval, evaluations, AI workflows, or AI UX.
• Outstanding customer discovery and product judgment.
• High agency and excitement for early-stage environments.

Responsibilities

• Partner directly with founders and customers to identify high-value problems.
• Translate ambiguous customer workflows into AI-native product experiences.
• Prototype ideas rapidly using AI before engineering investment.
• Work daily with engineers on architecture, implementation tradeoffs, and product decisions.
• Define success metrics and iterate quickly from customer feedback.
• Ship AI-native products using LLMs, agents, retrieval, workflows, and automation.
• Help establish Thorin’s product culture and quality bar.

Skills

Technical B2B SaaS product experience

Customer discovery

Startup/Founding experience

AI/LLM experience

Ambiguity handling

Cross-functional collaboration

Education

Computer Science or engineering background

Tools

LLMs

Agents

RAG

Retrieval

AI workflows

AI UX

Job description

Thorin is seeking a Founding Technical Product Builder to bridge customers, engineering, and founders. You will identify valuable problems, prototype AI-native solutions, and ship products with a focus on AI agents, LLMs, and retrieval workflows.

This is ideal for a founder, founding PM, Product Engineer, or deeply technical PM who thrives in ambiguity and loves building AI-native products. You’ll influence architecture, tradeoffs, and success metrics from the start, shaping Thorin’s product