Founding Engineer

crosby; New York (NY); On-site; USD 150,000 - 190,000; Full time

Benefits offered by this job

Competitive salary

Health, dental, and vision insurance

Unlimited PTO

In-person team in NYC

Job summary

Crosby is seeking a Founding Engineer to define and build the core technology stack powering our contract-review platform in NYC. You’ll influence technical direction and shape product experiences alongside the founders.

You’ll design scalable systems, build agentic AI tools, mentor engineers, and collaborate with cross-functional teams to accelerate speed and quality of legal workflows.

Qualifications

• 3+ years of engineering experience with Python and TypeScript.
• Bonus: NLP, LLMs, RL, Information Theory.

Responsibilities

• Design and implement scalable systems to process contracts at scale.
• Build agentic AI tools to assist the Crosby Legal team.
• Collaborate with founders and cross-functional teams to set technical priorities.
• Establish a robust and maintainable codebase as we grow.
• Mentor and recruit engineers to grow the team.

Skills

Python

TypeScript

NLP

LLMs

RL

Information Theory

Frontend Frameworks

Collaboration

Ownership

Job description

Welcome to Crosby, the next generation law company.

We're a team of technologists and legal experts working side by side to reimagine corporate legal services from the ground up. We build proprietary technology and human-in-the-loop workflows to radically enhance the lawyer-machine relationship. We want to review complex documents, for example, faster than ever and with perfect quality.

We believe:

1. A great legal system is the watermark of a great society.
2. Legal work is art and science. We want to discover the frontier between the two and codify the scientific parts, which is a magnificent puzzle.
3. Selling work – not software – is the best way to realize the productivity gains of GenAI for professional services.
4. In an in-person culture at our NYC office.

Crosby was founded by Ryan(Penn, Stanford Law, ex-Cooley, former GC) and John(Penn M&T, ex-Ramp, ex-Google).

The Role

As a Founding 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.

In this role, you’ll collaborate directly with the founders, define technical priorities, and ensure the scalability of our platform. You'll have a direct impact on our product and user experience as we create tools to make contract review faster and more efficient.

What You’ll Do

• 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.

What We’re Looking For

• Experience: 3+ years of engineering experience, ideally including Python, TypeScript. Bonus if experience with NLP, LLMs, RL, and Information Theory. Optional: Experience with modern front‑end frameworks (e.g., React, Vue, or Svelte).
• 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.

Benefits

• Competitive salary and equity compensation.
• Comprehensive health, dental, and vision insurance.
• Unlimited PTO
• In‑person team in NYC with a collaborative, high‑energy environment.