StackOne

A company providing an integration layer that lets software products and AI agents connect to many other tools, with a London AI team.

About StackOne

StackOne calls itself the universal integration gateway for modern software products and AI agents. It offers unified APIs for HR systems, recruiting tools, CRMs and customer success platforms.

We did not find a formal mission statement. Its job listing says it values end-to-end ownership and fast delivery, and treats diversity as a source of innovation.

A listing for an AI Engineer was in London, in the office with typically two days a week on site (listing removed 7 October 2025). The listing gives the company's headquarters as Lisbon, so its UK presence is a London team rather than a head office.

It had about 51 employees on that listing. This is old evidence.

We found no graduate or internship programmes. Roles seen are for experienced engineers.

What they do

• {'desc': 'One way to connect to many tools.', 'title': 'Unified APIs'}
• {'desc': 'Connecting agents to business software.', 'title': 'AI agent tools'}

Key facts

• London-based AI Engineer role (listing removed 7 Oct 2025)
• Headquarters listed as Lisbon
• About 51 employees (2025 listing)
• SOC 2 compliant (own claim)

Website: www.stackone.com