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Founding Product Engineer

San Francisco💼 Full-time💰 $200,000–$250,000🗓 2026-09-22 → 2026-09-25

Core

Founding-level engineer owning end-to-end product modules for an AI-driven B2B SaaS pricing and monetization platform.

Role type

Founding Product Engineer (hands-on IC)

Builds

AI-driven pricing, monetization, and billing features for B2B SaaS customers

Domain

B2B SaaS, AI/LLM agents, Financial/Pricing

Deliverable

production ML models | product features

Required skills

Full-stack engineering, Backend (FastAPI, Python, MongoDB), Frontend (React, TypeScript), AI/LLM agent integration, MCP-style server development, Financial logic design, API versioning, Typed data modeling (Pydantic)

Preferred skills

B2B SaaS monetization concepts, Billing/metering/CPQ systems, Data-dense frontend, Conversational interfaces, Early-stage startup experience

Technologies

FastAPI, Python, MongoDB, React, TypeScript, Pydantic, MCP

Responsibilities

Scope, design, and build whole product modules independently; Design and evolve architecture for agentic AI systems; Move pricing logic to backend services; Extend typed pricing ontology; Lead architectural reviews; Establish testing and observability practices; Mentor peers and influence product strategy

Seniority

Founding, hands-on IC with mentorship

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