Senior AI Product Designer

5w1 month ago

Hearth

New York City, US · Full-time · $180,000 – $200,000

About this role

Hearth is the AI growth system for local home improvement small businesses, building revenue-critical software for contractors. We are now building Harper, a personal AI employee that autonomously generates sales for trades pros. As Senior AI Product Designer, you will own how millions experience AI for the first time.

You will run rapid validation and user testing with real contractors, spending over a quarter of your time with customers. You design and ship experiences that inflect the growth rate of the business, translating powerful technology into intuitive tools usable in under five minutes. Own the entire Harper AI experience from onboarding to message center and intent editing.

You are a true builder and partner to engineers, accelerating time to ship and injecting the voice of the customer. Your work is high agency and high urgency, driving experiments from insight to shipped result in days, not months. You operate as the connective tissue between product, engineering, and the customer.

Hearth has 15,000+ paying customers, default profitability, and backing from top investors like Founders Fund and 8VC. You will shape how a massive, underserved industry experiences AI for the first time, with the potential to inflect the growth rate of the business. This is a high-impact role with meaningful commercial impact.

Requirements

Proven experience designing AI-powered products or conversational interfaces.
Strong portfolio demonstrating end-to-end product design with measurable business impact.
Proficiency in rapid prototyping and user testing with real-world users.
Ability to work in a high-agency, high-urgency startup environment.
Strong collaboration skills with engineers and product managers to accelerate shipping.
Comfort spending significant time in the field with customers (25%+).
Experience with design systems and interaction patterns for complex interfaces.

Responsibilities

Own the Harper AI experience end-to-end, including onboarding, message center, intent previewing, and all AI-powered touchpoints across web, mobile, and messaging.
Run weekly rapid interviews with contractors, test prototypes in the field, and synthesize qualitative signals into product decisions.
Build and maintain production-grade components for AI interfaces to reduce engineering ambiguity and accelerate the team.
Translate product outcomes into acceptance criteria and engineering tickets with required instrumentation events.
Draft hypotheses, define success metrics, ship lightweight A/B experiments, analyze impact, and iterate in days.
Spend 25%+ of your time with customers to understand their needs and unblock the team.

Benefits

Generous pre-IPO equity package.
Hybrid work model with in-office collaboration 3x per week in NYC.
Company with strong market traction (15,000+ paying customers) and backing from top investors (Founders Fund, 8VC, Human Capital).