Reply.io

Reply was founded in 2014 by Oleg Campbell, a developer turned salesperson who wanted to automate the manual emails and follow-ups that ate his team's time.

Today Reply.io is a sales engagement platform for multichannel outreach across email, LinkedIn, SMS and calls. Its AI SDR agent, Jason AI, finds prospects, writes outreach and handles replies, backed by a large B2B contact database and deliverability tools; developers can build on it through a public API and an MCP server.

The company works fully remotely, with team hubs in Toronto, Kyiv and Dnipro, and more than 2,000 clients use the product.