Lassie builds AI agents that handle the administrative work behind doctors’ offices, starting with dental practices. Its software reconciles insurance payments, updates practice records, and flags exceptions for people to review.

Jobs

open roles

Focus

Doctors’ offices

AI for everyday administrative work

Total raised

$47M

including the $35M Series A announced June 2026

Why we invested

In our June 2026 investment memo, we argued that AI could take on the recurring administrative work that small-business owners never set out to do. Dental practices provide a starting point: structured workflows that still require extensive manual effort.

Lassie’s founders learned those workflows inside a dental office. Our thesis centers on the integrations and business context required to complete work across existing systems, including knowing when to ask a person for help.

→ Investing in Lassie · June 2026

Our participation

$35M Series A

a16z led · June 2026

The opportunity

Autonomous operations

Starting with dental administration

Featured Jobs

See all 16 roles

Lassie

Customer Operations

San Francisco, California, USA·Posted 4 months ago

Apply

Lassie

Product Marketer

San Francisco, California, USA·Posted 4 months ago

Apply

Lassie

Software Engineer, Security

San Francisco, California, USA·Posted 4 months ago

Apply

Product story

Origins

Learn the work from inside the office

Steijn Pelle and Frédéric Renken worked in Dr. Eric Kwon’s dental office, processing payments themselves before building software for the workflow.

The founding storya16z ↗

Funding rounds

Date

Round

Raised

Valuation

Lead / investors

3 Jun 2026

Series A

Raised $35M

Valuation

a16z led; with Night Capital, Rahul Vohra, Zach Perret, Taavet Hinrikus, Gokul Rajaram, and Brian Balfour.

Team

Steijn PelleCo-founder & CEOPreviously a product manager at Robinhood and Coinbase. Leads Lassie’s work on autonomous systems for small businesses.LinkedIn ↗

Frédéric RenkenCo-founderSuperhuman’s first product hire, with earlier product experience at Uber. Builds AI agents for healthcare administration.LinkedIn ↗

Seth HamsonHead of Customer ExperienceHelps practices improve insurance, payment, and back-office workflows. Previously worked on financial operations with technology companies at Brex.LinkedIn ↗

Culture

How Lassie works

Founding practice

Do the work before automating it

The founders spent time processing payments inside a dental practice. That experience shaped the workflows they chose to build.

a16z founding story · June 2026 ↗

Team

A small, flat team

Lassie describes a flat team that values careful craft, rigorous thinking, and straightforward communication. Its company page invites builders and operators to tackle unresolved problems together.

Lassie company and careers ↗

Product engineering

Correctness is part of the job

The product engineering role includes diagnosing production incidents, building reliable data pipelines, and improving the tools engineers use to ship safely.

Product engineering at Lassie ↗

Engineering tools

Choose tools that help you build

Lassie’s engineering posting emphasizes investment in developer productivity and freedom to choose tools. The listed stack includes Python, Postgres, Redis, TypeScript, and React.

Product engineering at Lassie ↗

Customer success

Build the playbook as you go

Deployment Strategists help create the implementation and account-management playbooks that future hires will use, working directly with practice owners through their first automated workflows.

Deployment Strategist role ↗

Customer feedback

Bring the practice into product decisions

The deployment role includes a structured feedback loop with product, sales, marketing, and the founders. What the team learns from practices helps shape what gets built.

Deployment Strategist role ↗

Interview process

Meet the team through a small project

Current engineering and deployment postings describe initial conversations with the team and founders, followed by an office visit to work on a small project and meet colleagues.

Joining Lassie ↗

Location

San Francisco roles

The roles listed on Lassie’s careers board are based in San Francisco. The board does not specify a company-wide remote or hybrid policy.

Lassie careers · viewed September 2026 ↗