Founding Full-Stack Engineer

Moritz; San Francisco (CA); On-site; USD 150,000 - 230,000; Full time

Job summary

Moritz, an AI-native law firm in San Francisco, is building software that handles high-value, professional work with lawyers in the loop. You will join our founding engineering team, work in person alongside founders and lawyers, and ship agent-enabled workflows that scale across hundreds to thousands of matters daily.

You will own end-to-end features, build intuitive surfaces for client intake and delivery, and contribute to a trustworthy, reliable agentic workspace at scale.

Qualifications

• Must be a product-minded full-stack engineer who owns problems from database to UI.
• Experience shipping agentic systems to production is a plus.
• Comfort with a modern TS/React stack and cloud infra.

Responsibilities

• Shape features end to end: understand problem, build, ship, and iterate with feedback same day.
• Build functional client surfaces for intake, communication, and delivery of results with designers and engineers.
• Iterate on the agents workspace: review queues, diff views, and controls to approve or elevate quickly.

Skills

Product-minded

Full-stack engineer

Ownership mindset

Frontend & UI care

Tools

Next.js

React

TypeScript

Node.js

PostgreSQL

AWS

Temporal

tRPC

Job description

Moritz is an AI-native law firm. We don't sell software to lawyers; we are the law firm, and our engineers build the agents that do much of the work. Every improvement to our agents shows up directly in our margins and our clients' bills.

We're not trying to make lawyers 20% faster. We're building a law firm where software performs most of the work and our lawyers own the result. Our agents do the drafting and review; our lawyers spend their time on the judgment. That changes the engineering problem. Our agents have to be reliable enough for a lawyer to put their name on the output, and for a client to act on it.

We've handled more than $3 billion in contracts across 100 companies, and raised a $9M seed in four days from Y Combinator and the founders of Reddit, Instacart, Cruise, Dropbox, Gusto and Runway.

The opportunity

Most companies building AI for professional work stop at copilots. We're going much further: systems that perform large parts of the work of a professional services firm. Our lawyers own the outcome, That means solving problems that are still wide open. How do agents operate across long-running workflows? How do you evaluate work where mistakes matter? When should a system act, and when should it escal? How do humans and agents divide thousands of consequential decisions every day?

If we're right, AI-native professional services firms will look more like software companies with professionals in the loop.

About The Role

You'll join our founding engineering team in San Francisco, working in person alongside the founders and our lawyers. Our lawyers sit next to you and use what you build all day. When an agent gets a redline wrong, you hear about it that afternoon and fix it together.

We've built agents that draft, review and negotiate contracts, intake that turns client requests into structured legal work, and software used every day by lawyers and clients. Your mission is to iterate and improve on that system, to handle hundreds, and eventually thousands, of matters a day without compromising the quality.

Who You'll Work With

Pamir, our CEO, advised OpenAI on contracts and privacy. Daniel, our COO is a Harvard-trained lawyer who has worked with frontier model labs. Stefan, our CTO, did his graduate work at MIT and has scaled ML products to hundreds of millions of users. Our lawyers come from Fenwick, Cooley and Goodwin.

What You'll Own

• Shaping features end to end. Sit with our lawyers, understand the problem, build it, ship it and get feedback the same day.
• Building functional and beautiful client surfaces for intake, communication with counsel and delivery of results. Work together with design engineers to ship intuitive, sleek and responsive pages.
• Iterating on the lawyers' agentic workspace: review queues, redline and diff views, agent chat surfaces, citations, and controls to approve, edit or elevate in seconds
• Building operations tooling including dashboards, automations and integrations with Slack, email, document and e-signature platforms, and payment and billing providers
• Making our agents trustworthy and reliable at scale. Improve the the evals, observability and infrastructure that ensure agents are doing the right thing
• Take part in shaping how we build. Architecture, engineering standards and the team around you.

How We Build

We're TypeScript end to end: a Next.js and React frontend on a tRPC API, Node.js and PostgreSQL on AWS. Our agents run inside harnesses we build ourselves, orchestrated as durable workflows in Temporal, powered by popular agent SDKs.

You will be a great fit if you

• Are a product-minded full-stack engineer who likes owning problems from the database to the UI.
• Shipped agentic systems to production and can share some war stories
• Maintained and evolved a large codebase over years at a company past the prototype stage
• Want the intensity of an early-stage company: priorities move quickly, you work directly with users, and you carry more responsibility than you would anywhere larger.

What You Get

• Competitive salary and significant equity, in a company still early enough for your work to materially shape the outcome.
• The best AI tooling we can buy, and a code base optimized for agentic development.
• A real say in defining what an AI-native professional services firm looks like.

If making AI reliable enough to do work people currently pay lawyers hundreds of dollars an hour for sounds like an unusually interesting engineering problem, we'd like to talk.