# Founding Engineer

**Company:** [Thirdlayer](https://zerogtalent.com/ai-companies/thirdlayer)
**Location:** San Francisco, CA, US
**Work mode:** On-site
**Seniority:** Entry
**Employment type:** Full Time
**Salary:** USD 130K–250K/yr
**Category:** Engineering
**Department:** Engineering
**Listed:** 2026-09-28

[View and apply on Zero G Talent](https://zerogtalent.com/ai-jobs/thirdlayer/founding-engineer-76656)

## What you'll do

- Build core agent components: memory, context compression, protocols
- Develop high-performance state management and real-time UI observation
- Create scalable infrastructure for browser-native AI

## What you need

- Expert in React/Next.js, TypeScript, Python
- Deep browser internals experience
- Proven rapid prototype to production track record
- AI/ML infra or agentic systems experience (preferred)

## Job description

We're creating the third layer of interaction — a personalized AI action layer that lives across all your workflows. If that excites you, and you’re a world-class infrastructure expert, please apply.

### Why Dex Matters

-   Flow is everything. Every tab switch, every UI reload, every wait for an AI handoff kills momentum. 
-   The future of productivity is collaborative AI. Dex is an active, real-time partner embedded directly in your browser—the place where your work actually lives.
-   Context makes or breaks a product. You need systems that understand where you are, what you're doing, and what should happen next.

### What You'll Build

-   Core agent components, including memory stores, context compression, inter-agent protocols, planning and tool use.
-   High performance state management and real-time UI observation systems.
-   Scalable infrastructure for browser-native AI.

### Requirements

-   Expert in React/Next.js, TypeScript, and Python.
-   Deep browser internals experience.
-   Proven rapid prototype to production track record.
-   Preferred: Prior experience with AI/ML infra or agentic systems.

### Sample Projects

-   Translating browser inputs (voice, keyboard and mouse inputs, tab changes, DOM) into actionable workflow graphs.
-   Agentic systems that predict and execute users’ next steps in complex workflows.
-   A searchable, self-updating memory store for personalized user flow paths.

## Other open roles at Thirdlayer

- [2026 Summer AI/ML Engineer Intern](https://zerogtalent.com/ai-jobs/thirdlayer/2026-summer-ai-ml-engineer-intern-80750) — San Francisco, CA, US
- [AI Engineer Intern](https://zerogtalent.com/ai-jobs/thirdlayer/ai-engineer-intern-76658) — San Francisco, CA, US
- [Full-Stack Engineer Intern](https://zerogtalent.com/ai-jobs/thirdlayer/full-stack-engineer-intern-76659) — San Francisco, CA, US
- [Summer 2026 Full-Stack Engineer Intern](https://zerogtalent.com/ai-jobs/thirdlayer/summer-2026-full-stack-engineer-intern-80751) — San Francisco, CA, US

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*Source: [Zero G Talent](https://zerogtalent.com), the job board for space, defense, AI, robotics and frontier-tech companies.*