About HoldThat
The operating layer behind modern operations.
HoldThat is an operational systems platform. We build the structured layer growing businesses rely on when spreadsheets, group chats, and disconnected SaaS stop scaling.
Founder
Antonia Sevilla
HoldThat was founded by Antonia Sevilla to help businesses replace fragmented operations with structured operational systems. After years of watching growing teams duct-tape together email, spreadsheets, chats, forms, and SaaS tools that were never built to connect, she built HoldThat as the operating layer they actually needed — one connected system for events, clients, and the work in between.
Brand & Products
HoldThat is the parent brand. Everything else is a product.
HoldThat is the operational systems company. EventOS, Client Hub, LegalHub, and Custom OS are products and services built and operated under the HoldThat brand.
Event operations system for registrations, vendors, sponsors, check-ins, and event-day coordination.
Secure client portal for onboarding, documents, bookings, messaging, and referrals.
Secure legal client portal for intake, document workflows, e-signatures, and case updates.
Custom CRMs, automations, and internal tools built when off-the-shelf software falls short.
Mission
Replace scattered tools with one operating layer.
We build operational infrastructure for service businesses, event organizers, law firms, and agencies that have outgrown fragmented work.