Founding Product Engineer

Digitailor; San Francisco (CA); On-site; USD 200,000 - 300,000; Full time

Job summary

Digitailor is building an early-stage consumer AI startup. We seek a founding product engineer to own the AI agent and the end-to-end user experience, from onboarding to trusted connections.

You will ship features from concept through experiment, coordinating with product, engineering, and design to deliver measurable outcomes. Based in San Francisco, this on-site, full-time role offers significant ownership of the product and the chance to shape how users interact with AI assistants across

Qualifications

• 4+ years of software engineering experience, including AI products or consumer AI systems.
• Experience building agents with tool use, memory, and evaluation for release decisions.
• Strong full‑stack skills with modern JS frameworks and databases.

Responsibilities

• Build the agent's decision-making system with tool calls, memory, and routing.
• Create evaluation tools and regression suites to ensure quality before releases.
• Own the mobile and web product experience, including onboarding, follow-ups, and trusted connections.
• Ship features from concept through experiment and release using data and feedback to guide decisions.
• Integrate email, calendars, payments, and browser automation with robust recovery flows.

Skills

Full-stack development

TypeScript

React

Next.js

PostgreSQL

AI systems

Memory/Conversation AI

Tools

OAuth

Payments APIs

Browser automation

MCP servers

Function calling

Job description

About The Role

Join an early-stage consumer AI startup as its founding product engineer, with ownership of the AI agent and the user experience from end to end. You will work across product engineering, agent behavior, and evaluation, helping shape a personal assistant that can take useful actions while earning user trust.

What You'Ll Do

Build the agent's decision-making system, including tool-calling loops, memory, context assembly, prompt design, and model routing. Create evaluation tools such as turn-level judges, conversation replay, and regression suites to assess response quality before releases. Own the mobile and web product experience, including onboarding, follow-ups, group conversations, approvals, and trusted connections. Ship features from concept through experimentation and release, using user feedback and product data to guide decisions. Build integrations with email, calendars, booking services, payments, and browser automation, with reliable recovery and user approval flows. Review conversation transcripts, speak with users regularly, and help set engineering standards and grow the team.

What We'Re Looking For

At least 4 years of software engineering experience, including work on AI products, AI systems, or consumer products used at scale. Production experience building agents with tool use, persistent conversations, and memory, plus evaluation systems that support release decisions. Full-stack skills with TypeScript, React, Next.js, and Postgres. Experience with third-party APIs, OAuth, payments, or agent tools such as function calling, MCP servers, or browser automation. A record of owning features end to end and delivering measurable product outcomes, with strong product and design judgment. Comfort using AI-assisted development tools while verifying and taking responsibility for shipped code. Post-training or fine-tuning experience is a plus. Compensation & Benefits Base

Salary

$200,000 to $300,000 annually. Visa sponsorship is not available.

Location

On-site in San Francisco, California. Full-time role.