sponge

Y Combinator Backed by Y Combinator

Onboard users faster

What we're building

Onboarding a user is a horizontal process spanning multiple systems and teams. Account status, documents, and communications are often fragmented across disjoint systems.

Sponge is an account management platform to streamline user onboarding. It integrates with your existing systems to automate follow-ups, reduce review times, and keep cases from falling through the cracks.

Sumsub Persona Alloy Trulioo Pylon Zendesk Intercom Salesforce HubSpot Slack Gmail Postgres Snowflake BigQuery Databricks
Sponge reads case state from each system, automates follow-ups, and writes decisions back.

Contact us if your team still spends significant following up with customers, copying context between systems, or coordinating compliance reviews.

About us

We're three former Stripe staff engineers who built financial infrastructure to onboard and manage millions of users at Stripe. We experienced firsthand how fragmented tooling and handoffs can delay account activation and consume significant engineering and operations time.