Founding Fullstack Engineer

Location: San Francisco, CA (Onsite)

Compensation: Market competitive base + equity

Stage: Seed | AI | ~$4M funded | ~5 person team

About Our Client

Our client is a seed-stage AI company building the operating system for in-house legal teams. Their platform eliminates the fragmented, manual workflows that cost legal teams millions in outside counsel spend each year, replacing them with centralized, AI-powered matter management and contract workflows.

The long-term vision is to become the universal knowledge layer for legal operations. They're early, well-funded, and already running active pilots with major in-house legal teams.

Culture: high-ownership, technically rigorous, transparent, and fast-moving. Everyone here builds things that matter and ships them.

The Role

• This is a founding-level engineering role. You won't be handed a backlog of tickets. You'll look at a problem, decide how to solve it, build it, and own what happens after it ships.
• As a Senior Full-Stack Engineer working on the Platform, you'll be responsible for the integrations, data infrastructure, and AI retrieval systems that sit at the core of the product. You'll have a direct line to leadership, real input on roadmap decisions, and the kind of surface area that only exists at a 5-person company.
• If you want to know you built something, this is that job.

What You'll Own

• The integration layer connecting the platform to Google Workspace, Slack, Notion, and future enterprise systems. You'll design the architecture, own the reliability, and extend it as the product grows.
• Backend services and APIs that power core product workflows. You'll make the calls on structure, performance, and scalability.
• The AI retrieval and knowledge systems (RAG pipelines, indexing, ETL) that make the platform actually intelligent. You'll understand these well enough to improve them, not just maintain them.
• Frontend surfaces that legal teams interact with daily. You care about the experience, not just the functionality.
• Workflow orchestration across complex async processes. You'll architect for correctness and resilience, not just delivery.
• Observability and platform health. You'll know when something's wrong before a user does.
• Engineering standards and culture. As one of the earliest engineers, what you build and how you build it sets the bar.

What We're Looking For

• 3+ years of professional engineering experience, ideally in a startup or high-velocity environment
• Strong full-stack ability: Python/FastAPI on the backend, React/TypeScript on the frontend
• A track record of owning features end-to-end, not just shipping PRs
• Comfort operating in ambiguity. You don't need a complete spec to start building.
• Strong system design instincts. You think about what breaks before it breaks.

Bonus points for:

• Temporal.io or comparable workflow orchestration experience
• ETL pipelines, RAG systems, or LLM API integrations (Anthropic, OpenAI, Gemini)
• PostgreSQL, Redis, distributed systems at scale
• AWS production deployments
• TailwindCSS / shadcn/ui

Tech Stack

Python, FastAPI, React, TypeScript, Temporal.io, PostgreSQL, Redis, Docker, AWS, TailwindCSS, shadcn/ui, Anthropic API, Google Gemini API

Why This Role

• Greenfield platform with real traction. You're not inheriting tech debt, you're building the foundation.
• Direct access to leadership and a real voice in product direction
• Five-person team. Your fingerprints are on everything.
• A problem space with genuine complexity: AI, legal workflows, enterprise data, and security intersecting in interesting ways

Interview Process

1. Recruiter Screen
2. Technical Deep Dive
3. Integration or System Design Exercise
4. Culture / Values Interview