Ukrainian-founded · YC S18

Quo

Quo, formerly OpenPhone, is a San Francisco communications platform co-founded by Kyiv-born entrepreneur Daryna Kulya. It announced $105 million in growth financing in September 2025.

Visit Quo ↗YC Summer 2018 profile ↗

Accelerator: YC Summer 2018
Stage: Growth financing ↗
Hiring: Hiring ↗
Founded: 2018
Location: San Francisco
Focus: AI · Business communications
Status: Active

Recent momentum

$105M in growth financing in September 2025 alongside the OpenPhone-to-Quo rebrand and expansion of its Sona AI agent.

Funding stage

$96M go-to-market financing from General Catalyst’s Customer Value Fund plus $9M in equity, announced in September 2025.

Stage source ↗

Hiring signal

The official careers page is accepting applications for open roles.

Jobs ↗

Ukrainian connection

Co-founder Daryna Kulya was born in Kyiv and later studied and worked in Canada before building Quo in the United States.

Founders

Daryna Kulya

Co-founder · Ukrainian-born co-founder from Kyiv.

LinkedIn profile ↗

Mahyar Raissi

Co-founder and CEO · Co-founded Quo with Daryna Kulya and scaled it in the U.S. market.

LinkedIn profile ↗

Sources

OpenPhone becomes Quo and raises $105M ↗Quo · Supports: funding, momentum, name change, product.
Quo company profile ↗Y Combinator · Supports: company, batch, founders, location, status.

Reviewed August 8, 2026. Methodology.