Founding Product Engineer for an AI Legal Platform

ARCEUS; San Francisco (CA); On-site; USD 140,000 - 180,000; Full time

Benefits offered by this job

Competitive base salary commensurate

Competitive equity

Health, dental, and vision coverage

Catered lunches and dinners

Wellness and learning stipends

401(k) contributions

Unlimited PTO

Job summary

ARCEUS is hiring a Founding Product Engineer to build the platform that’s reinventing how legal work gets done. You’ll sit next to attorneys and AI engineers, turning real legal judgment into software that ships fast with high quality.

This in-person role is based in San Francisco. You’ll own core product features, shape engineering culture, and collaborate across teams to move from ideas to production with urgency and craft.

Qualifications

• 1-3 years building and shipping production software.
• Willing to work 12+ hours per day, 6 days a week.
• Thrive in a high-bar, high-ownership environment.
• Strong product instincts and full-stack ability (TypeScript/React, modern backend, SQL).
• Built something with AI/LLMs, in a job or on your own.
• Own features end to end and make sound engineering trade-offs.
• Comfortable with ambiguity and fast-moving, high-ownership environment.
• Excellent judgment and communication.

Responsibilities

• Build and own core product features across the stack, from data models to interfaces used daily.
• Partner with AI engineers and attorneys to turn workflows into reliable software.
• Make pragmatic architecture and tooling decisions for speed without locking in.
• Own quality: write maintainable code and ensure production reliability.
• Help define engineering culture, standards, and hiring as the team grows.
• Move work to the finish line when it matters—customer experience comes first.

Skills

Full-stack

Product mindset

Ownership

TypeScript/React

AI/LLMs experience

Engineering trade-offs

Strong communication

Tools

Relational databases

Job description

ARCEUS is hiring a Founding Product Engineer to build the platform that’s reinventing how legal work gets done. You’ll sit next to attorneys and AI engineers, turning real legal judgment into software that ships fast with high quality.

This in-person role is based in San Francisco. You’ll own core product features, shape engineering culture, and collaborate across teams to move from ideas to production with urgency and craft.