Founding Senior Product Engineer, AI Security Platform

limitless; San Francisco (CA); On-site; USD 234,000 - 286,000; Full time

Benefits offered by this job

Founding equity

Brand new SF office

Job summary

Limitless is seeking a Senior Product Engineer to join as part of the founding team in San Francisco. You will build the core platform from the ground up, partnering with the founders to define product direction and architecture, with a focus on AI agent capabilities.

This role centers on a TypeScript stack (Node and React). You’ll play a key part in shaping engineering culture and delivering secure, scalable systems as the team grows.

Qualifications

• Strong product engineering experience in TypeScript (Node and React).
• Experience building AI agents or agentic systems is highly desirable.
• Solid backend and distributed systems fundamentals.

Responsibilities

• Build and own core backend and data infrastructure the platform runs on.
• Help design the architecture behind the company’s AI agents.
• Ship product end to end across TypeScript (Node and React).
• Work directly with the founders to shape product direction and technical decisions.
• Help shape engineering standards as the team grows.
• Build production-grade systems with emphasis on reliability and security.

Skills

TypeScript

Node.js

React

AI agents

Distributed systems

Tools

AI/ML backends

Job description

Limitless is seeking a Senior Product Engineer to join as part of the founding team in San Francisco. You will build the core platform from the ground up, partnering with the founders to define product direction and architecture, with a focus on AI agent capabilities.

This role centers on a TypeScript stack (Node and React). You’ll play a key part in shaping engineering culture and delivering secure, scalable systems as the team grows.