Founding Product Engineer - AI Legal Platform (SF)

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

Benefits offered by this job

Competitive base salary

Equity in the company

Health, dental, and vision coverage

Catered lunches and dinners

Wellness and learning stipends

401(k)

Unlimited PTO

Job summary

Arceus, the AI-native law firm, is hiring a Founding Product Engineer to build the platform that reinvents how legal work gets done. This is an in-person role based in San Francisco, working alongside attorneys and AI engineers to turn real legal judgment into reliable software shipped with speed and quality.

You will own features end to end, influence architecture and tooling, and help define engineering culture as the team grows.

Qualifications

• 1–3 years building and shipping production software, ideally at an early-stage company or as a founder
• You ship, own features end to end, and care about user experience
• You move fast and deliver with urgency
• Experience with AI/LLMs in a product context is a plus
• Ability to work with attorneys and AI engineers to turn workflows into software
• You thrive in a high-ownership, fast-moving environment

Responsibilities

• Build and own core product features across the stack from data models to user interfaces
• Collaborate with AI engineers and attorneys to translate legal workflows into reliable software
• Make pragmatic architecture and tooling decisions to move fast without compromising quality
• Own quality and shipping reliability in production
• Help define engineering culture, standards, and future hiring
• Move work across the finish line when customer experience matters

Skills

Full-stack development

TypeScript/React

AI/LLMs experience

Ownership & accountability

Strong communication

Tools

Relational databases

Job description

Arceus, the AI-native law firm, is hiring a Founding Product Engineer to build the platform that reinvents how legal work gets done. This is an in-person role based in San Francisco, working alongside attorneys and AI engineers to turn real legal judgment into reliable software shipped with speed and quality.

You will own features end to end, influence architecture and tooling, and help define engineering culture as the team grows.