“We went from producing a lot of the code ourselves to now overseeing the work that Codex can produce,” says Joe Dunleavy, Endava’s regional CTO for Europe. “The quality of output has just gone up exponentially.”

Endava now calls itself an agentic organization: a company where senior expertise is codified into agents that work alongside teams across the entire client engagement lifecycle, from intake to ideation and, finally, delivery.

Codex changes how senior and junior engineers work together, says Mike Krolnik, Endava’s Global SVP of Agentic Architecture. “Senior architects like myself, coming from complex environments, are able to articulate what we want, and Codex makes that an accessible piece of information for the more junior people on the team. And from the junior perspective, they’re able to adopt this tool and create senior, mature-level outputs.”

In practice, that means giving junior developers work that would normally be reserved for senior engineers, with Codex acting as a guide on best practices and architectural decisions. “I can give Codex a point of view, and when they’re working, it will help them understand this point of view,” Krolnik explains. “They can ask questions about things they don’t understand. As a learning tool during development, I’m able to take my experience, codify it, and have Codex work with the team to teach them better practices in software architecture and development.”