People, Practices & CareerConference50min
0 to 350 Engineers on Claude Code: What Could Go Wrong?
AI coding agents are transforming software development, enabling non-developers to build features and teams to work end-to-end. The talk explores real-world adoption, risks like large uncontrolled changes, cost management, and how developers and organizations must adapt to prompting, agents, skills, and CI/CD.
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Nicolas MartignoleBack Market
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Wednesday, October 7, 15:10-16:00
TBA 4
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We are living through a revolution.
From assisting us in writing code to coordinating a fleet of agents, we find ourselves in the eye of the storm. Coding agents like Claude Code, Copilot, Codex CLI, and Cursor are reshaping our craft and our place within the company.
I brought Claude Code to my company, Back Market, in June 2025. We were "behind" other companies, such as Doctolib. Step by step, we moved from smart autocompletion to writing features end-to-end. Today we have Product Managers who write code, developers who do architecture and design, and managers who build their own internal tools—all with Claude Code. And there's me, looking at how we can control our monthly spending, leading a team of 40 subject-matter experts, with successes (and failures).
But more broadly, what's the flip side? What happens when a junior developer opens a single pull request with 50 modified files using Claude Code? What happens when one team migrates a module in place of the team that originally owned it, with Claude Code? What are the risks, and how do you stay in control within your company?
Finally, as developers—whether junior or senior—this asks us to adapt.
How do we get up to speed? What does prompting actually mean? How does an agent work? What are Skills? What's the impact on CI/CD? On the Platform engineering teams? On the run side? On upfront design?
I don't think AI will replace developers. I think developers who use AI can replace us.
From assisting us in writing code to coordinating a fleet of agents, we find ourselves in the eye of the storm. Coding agents like Claude Code, Copilot, Codex CLI, and Cursor are reshaping our craft and our place within the company.
I brought Claude Code to my company, Back Market, in June 2025. We were "behind" other companies, such as Doctolib. Step by step, we moved from smart autocompletion to writing features end-to-end. Today we have Product Managers who write code, developers who do architecture and design, and managers who build their own internal tools—all with Claude Code. And there's me, looking at how we can control our monthly spending, leading a team of 40 subject-matter experts, with successes (and failures).
But more broadly, what's the flip side? What happens when a junior developer opens a single pull request with 50 modified files using Claude Code? What happens when one team migrates a module in place of the team that originally owned it, with Claude Code? What are the risks, and how do you stay in control within your company?
Finally, as developers—whether junior or senior—this asks us to adapt.
How do we get up to speed? What does prompting actually mean? How does an agent work? What are Skills? What's the impact on CI/CD? On the Platform engineering teams? On the run side? On upfront design?
I don't think AI will replace developers. I think developers who use AI can replace us.
Nicolas Martignole
Nicolas is a Principal Engineer at Back Market, a leader in refurbished electronic devices in 18 countries. He is also the co-creator and organizer of Devoxx France. He has a JVM background but has worked in different industries and technologies. Before joining Back Market, he was a Principal Engineer at Doctolib, during the COVID19 crisis.
He's also the author of "le Touilleur Express", a blog about the journey of a software developer.
He has a YouTube Channel with more than 800 subscribers, on GenAI and Coding Agent.
He's also the author of "le Touilleur Express", a blog about the journey of a software developer.
He has a YouTube Channel with more than 800 subscribers, on GenAI and Coding Agent.