Member of Technical Staff, Platform

Job Overview

As an Engineer, you’ll have the unique opportunity to define and build the core technology stack that powers Crosby’s platform. You’ll work across the stack, building the robust back-end systems and tooling interfaces needed to deliver on our vision.

About Crosby

Crosby is built on a simple conviction: a great legal system is the watermark of a great society — and the best legal work comes from combining human expertise with the right technology, not replacing one with the other.

Crosby is the first AI-native law firm, helping ambitious companies like Cursor, Ramp, and Cognition sign commercial contracts faster.

Legal work is both art and science, and we're mapping the frontier between the two — codifying what can be systematized, amplifying human judgment where it matters most. That's why the right way to bring AI into law isn't to sell software and walk away. It's to own the outcome together: higher-quality work, delivered faster. We build proprietary tools and human-in-the-loop workflows that change what's possible for corporate legal teams.

Crosby was founded by Ryan (Stanford Law, Cooley, startup GC) and John (Penn, first X employees at Ramp). We work together, in person, in New York City — because the best ideas still happen in the same room. Help us transform one of society's most important industries.

Key Responsibilities

• Design and implement scalable systems to process contracts at scale.


• Build bleeding-edge agentic AI tools to help the Crosby Legal team review contracts faster.


• Work closely with the founders and cross-functional teams to define and execute on technical priorities.


• Establish the foundation for a robust and maintainable codebase as we grow.


• Mentor and recruit engineers to help build out the team.

Required Qualifications

• Experience: 3+ years of engineering experience, ideally including Python, TypeScript.


• Problem-focused: Strong sense of the problem behind a problem, and attention to detail in delivering high-quality products.


• Builder mindset: Excited about the opportunity to create and scale systems from the ground up.


• Collaborative: Effective communicator who thrives in cross-disciplinary teams.


• Ownership: Driven to take responsibility for projects from ideation through execution.


• Curiosity: Passionate about learning and experimenting with new technologies.


• Strong Python, TypeScript skill set


• Strong experience with NLP, LLMs, RL, and Information Theory.


• Experience with modern front-end frameworks (e.g., React, Vue, or Svelte).