Software Engineer, Product at Lassie (San Francisco, CA)

Lassie· San Francisco, CA·2d ago

Role details

Employment

Full-Time

Job description

Our mission is to help small businesses run themselves. We’re starting with doctors’ offices, building autonomous systems that handle busywork and complete the workflows that keep the office moving every day. Our team is small, flat, and ambitious. We value craft, intellectual rigor, and direct communication.

ABOUT THE ROLE

Product engineers turn messy, high-value office work into software that feels simple, dependable, and fast. You’ll build the products doctors’ offices use every day to get work done without adding more work to manage.

YOU WILL BE A GREAT FIT IF YOU…

Are excited to work with frontier models
Engineer for reliability and correctness, not just functionality
Diagnose and resolve live production incidents with minimal disruption
Automate away repetitive work and build tooling that makes engineering faster and safer
Design schemas and pipelines for large-scale datasets to power applied AI
Are comfortable working across databases, caches, proxies, and job orchestration systems

SOME THINGS WE'VE BUILT

Data pipelines processing $1B+ in insurance claims
Systems that eliminate thousands of hours of paperwork every month
A sync engine backed by encrypted SQLite in the browser, enabling 100ms experiences blog.superhuman.com for healthcare payments and patient ledgers

TECHNOLOGY WE USE

We invest heavily in productivity. Engineers should have the best tools for the job and the freedom to choose them.

Python (Django, Pydantic AI), Postgres, Redis
TypeScript, React, Tailwind
Google Cloud Platform, Vercel
Linear, Slack, Notion

JOINING US

To start, you'll have a handful of conversations with our team and founders. If there is mutual excitement, we'll invite you to the office where you'll work on a small project and meet the team.

Why work at Lassie

Early‑stage impact: Join a lean, ambitious team (<25 people) backed by top‑tier investors (a16z) and already generating meaningful revenue. Every hire is a founding‑level contributor.
Hard, unsolved problems: Lassie is pushing the boundary on autonomous systems for SMBs – combining AI, integrations, and operations in a single product.
Culture: The company values craft, rigor of thought, direct communication, and shared optimism about the future. lassie.ai/company
Work policy: Not explicitly stated, but the team is concentrated in San Francisco (HQ) with additional presence in India and the Netherlands; given the early stage, a strong in‑person culture is likely.
Open roles (as of mid‑2026): Founding Growth Lead (GTM), Founding Recruiter. linkedin.com

About Lassie

Company Overview

One-liner: Lassie builds AI agents that run the financial and administrative busywork for independent doctors’ offices, starting with dental practices.
Entity Type: Private (Series A funded)
Headquarters: San Francisco, California, United States
Founded: Not publicly available (likely around 2023–2024 based on a16z investment timing)
Founders: Steijn Pelle (CEO & Co-Founder) and Frédéric Renken (Co-Founder)

Core Business

Primary industry: Healthcare technology / Revenue Cycle Management (RCM) for small practices
Target customers: B2B – independent dental and medical practices (SMBs)
Mission: Put small businesses on autopilot so healthcare providers can focus on patient care; ultimately build toward “the small business that runs itself.”

Products & Services

Lassie AI Agent: An autonomous software agent that handles end‑to‑end revenue‑cycle workflows. It enrolls electronic payments, reconciles EFTs, posts payments to the practice management system, flags underpayments and denials, and handles insurance claims. The agent operates directly within the practice’s existing systems and, according to the company, posts 98% of payments without human input. lassie.ai
Lassie Q&A & Dashboard: Lets practice owners ask questions about claims, cash flow, and daily metrics; the agent provides real‑time answers.

Market Standing

Valuation/Market Cap: Not disclosed
Key Metric: Annualized Revenue > $10 million (as of June 2026, reported by a16z)
Total Funding: $35 million Series A led by Andreessen Horowitz (June 2026), with participation from Homebrew, SV Angel, and Go Global Ventures. a16z.com
Notable Investors/Partners: Andreessen Horowitz (lead), Homebrew, SV Angel, Go Global Ventures
Growth Signals:
- Trusted by 700+ practices across 49 U.S. states. lassie.ai
- Growth driven largely by referrals and inbound demand.
- Headcount of ~22 employees (as of mid‑2026), with a 2.7% monthly growth rate. linkedin.com
- 250,000 hours of labor returned to practices annually.
- Expanding beyond dental into broader small‑business automation.

Competitive Advantages

Deep workflow integration: Lassie connects directly to existing practice management systems and learns from every completed workflow, building a proprietary knowledge layer that generic AI models cannot easily replicate.
Autonomous execution: Unlike copilots that require human review, Lassie acts independently on 98% of payment posting and claims tasks, catching underpayments and missing claims that would otherwise slip through.
First‑mover in dental vertical: Dental practices have structured, repetitive, high‑value workflows with acute staffing pain, providing a defensible beachhead before expanding into other SMB verticals.

Strategic Focus

Scale within dental: Deepen product capabilities and automate more workflows (billing, insurance negotiation, scheduling).
Expand beyond healthcare: Apply the autonomous‑agent model to other small‑business verticals (e.g., contractors, retail) where “the small business that runs itself” is the ultimate goal.
Build the team: Currently hiring founding‑level roles (Growth Lead, Recruiter) to scale go‑to‑market and talent acquisition. jobs.ashbyhq.com

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