4xxi

4xxi is an AI development company that designs and builds digital products, working mostly in legal tech, fintech and edtech. A scientist founded it, and the engineers have worked together since 2008. The site reports more than 100 products shipped, and the team studies a client's industry before writing code.

What 4xxi offers

• RAG and language-model systems — AI products that draw on a client's documents and data.
• AI agents and automation — software that carries out tasks on its own.
• Web and mobile apps — products from first version to launch.
• Product process — research, planning and design, minimum viable product development, launch preparation and investor presentation.
• Transfer or maintenance — handing a product to the client's team or supporting it afterwards.

Who it works with

Founders and organisations in legal, financial and education technology. Work has included AI legal guidance for the American Arbitration Association.

Key facts

• Team working together since: 2008
• Products shipped: more than 100