Founding Engineer at VC-backed AI fintech startup

Jack & Jill; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Job summary

Jack & Jill seeks a Founding Engineer to build the technical core of an AI-native investment platform. You will create intelligent agents, model businesses, and automate complex financial workflows from start to finish.

This high-impact role offers substantial ownership and a path toward future leadership within a VC-backed fintech startup in San Francisco.

Qualifications

• Proven track record shipping production systems in high-growth environments.
• Strong background in applied AI, with experience in agents, retrieval, memory, or evaluations.
• Ability to manage data-intensive workflows and complex architectural decisions.

Responsibilities

• Design and build intelligence that models businesses and reasons about market interactions.
• Develop AI agents to coordinate months of financial work across many counterparties.
• Own end-to-end technical lifecycle including architecture, evaluations, infrastructure, and product interfaces for the autonomous banking core.

Skills

Production systems

Applied AI

Agent systems

Data-intensive workflows

Backend development

Job description

Job Title

Founding Engineer

Salary

Not Disclosed

Company Description

VC-backed AI fintech startup

Job Description

As a Founding Engineer, you will build the technical core of an AI-native investment platform designed to automate complex financial workflows. You will develop intelligent agents that model businesses and execute transactions from start to finish. This high-impact role offers substantial ownership, the chance to shape institutional operations, and a path toward future leadership.

Location

San Francisco, USA

Why this role is remarkable

• Build a defining institution from first principles, shaping its technical capabilities and culture from the very beginning.
• Backed by high-profile tech founders and top-tier VCs, providing the resources to solve massive, consequential problems.
• Work on bleeding-edge applied AI challenges, including multi-agent coordination, complex business reasoning, and large-scale data-intensive systems.

What You Will Do

• Design and build intelligence that models businesses, reconciles evidence, and reasons about complex market interactions and decision propagation.
• Develop sophisticated AI agents to coordinate months of financial work across hundreds of counterparties while maintaining context and commitments.
• Own the end-to-end technical lifecycle, including architecture, evaluations, infrastructure, and product interfaces for the autonomous banking core.

The ideal candidate

• Proven track record of shipping difficult production systems and owning critical technical decisions at high-growth startups or top-tier institutions.
• Strong background in applied AI, specifically with experience in agents, retrieval, memory, evaluations, or managing data-intensive workflows.
• Thrives in ambiguous environments, values extreme craftsmanship, and possesses the ability to move seamlessly between backend systems and product interfaces.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.

We appreciate this can make them look a bit suspect, but there isn't much we can do about it.