Founding Growth Engineer

FitNext Consulting; United States; Remote; USD 150,000 - 300,000; Full time

Benefits offered by this job

Founding-level equity

Fully remote within the US

Direct collaboration with founders

Job summary

FitNext Consulting is seeking a Founding Product Engineer to partner with the founders and build the interface for deploying and operating autonomous AI-powered enterprises.

You will own features end-to-end, blending full-stack engineering, UI/UX, and product thinking, from customer research and prototyping through development, launch, and iteration, including demos and launch content to drive adoption.

Qualifications

• 3+ years of software engineering experience.
• Hands-on full-stack engineering with UI/UX ability.
• Experience building and launching a product from zero to one.
• Practical experience with LLMs and agentic systems.
• Strong product judgment with usability and visual details.

Responsibilities

• Build full-stack features to deploy, manage, and interact with AI agents.
• Design polished interfaces that simplify complex agent systems.
• Own features end to end from research to production launch.
• Translate user feedback and usage data into product improvements.
• Create demos, launch content, and campaigns for shipped features.
• Maintain high standards for design, performance, and delivery speed.

Skills

Full-stack engineering

UI/UX design

Product thinking

Strong written communication

Customer focus

Ownership

Initiative

Collaboration

Execution

LLMs & agentic systems

Tools

Next.js

TypeScript

Python

FastAPI

Job description

Compensation

$150,000–$300,000 USD/year + 2%–4% equity

About the Company

We’re partnering with a Series A AI startup building autonomous companies: AI agent systems that execute business operations end to end, from building applications to running campaigns, closing deals, and supporting customers.

The company has raised $28.5M, and its product is already deployed at 500+ companies. The team is building the platform that enables users to deploy and manage AI employees through a single interface.

About the Role

As a Founding Product Engineer, you’ll work directly with the founders to build the interface where users launch and operate autonomous companies.

This is a hands‑on role combining full‑stack engineering, UI/UX design, and product thinking. You’ll own features from customer research and prototyping through development, launch, and iteration. You’ll also help create the demos and launch content that bring those features to market.

What You’ll Do

• Build full‑stack features that help users deploy, manage, and interact with AI agents.
• Design polished, intuitive interfaces that make complex agent systems easy to use.
• Own features end to end, from customer research and prototyping through production launch.
• Translate customer feedback and usage data into product improvements.
• Create demos, launch content, and campaigns for the features you ship.
• Maintain high standards for design, application performance, and delivery speed.

Must-Haves

• 3+ years of software engineering experience. Tech Stack: Next.js, TypeScript, Python, and FastAPI.
• Strong full‑stack engineering skills and hands‑on UI/UX ability.
• Experience building and launching a product from zero to one.
• Practical experience building with LLMs and agentic systems.
• Strong product judgment, with attention to usability, visual details, and interaction design.
• Strong written communication and the ability to explain technical products clearly.
• Product‑marketing instincts and an interest in driving adoption of what you build.

Nice-to-Haves

• Experience as a founder or early engineer at a startup.
• Experience building developer tools or AI-native products.
• Familiarity with agent orchestration, Model Context Protocol (MCP), or SDK design.
• Experience producing product demos, launch videos, or technical content.
• Hands‑on experience with Next.js, TypeScript, Python, and FastAPI.

Soft Skills

• Ownership: Take responsibility for features from the initial idea through launch and adoption.
• Initiative: Independently identify problems and move solutions forward.
• Customer focus: Understand user needs and translate them into thoughtful product decisions.
• Collaboration: Work closely with founders and connect engineering, design, and product marketing.
• Adaptability: Navigate evolving priorities in an early‑stage environment.
• Execution: Balance fast delivery with quality and attention to detail.

What’s Offered

• $150,000–$300,000 USD annual salary.
• Founding‑level equity of 2%–4%.
• Fully remote work within the United States.
• Direct collaboration with the founders and significant influence over the product.

Hiring Process

CTO interview followed by a paid remote work trial before a potential full‑time offer.

Work Authorization

Candidates must have existing US work authorization. Visa sponsorship is not available.