---
title: "AI Wars Ep. 3: The Return of the Developer"
url: https://daily.dev/posts/ai-wars-ep-3-the-return-of-the-developer-vqojhscc5
source_url: https://marmelab.com/blog/2026/05/07/episode-3-the-return-of-the-developer.html
type: article
source: "marmelab"
published: 2026-05-07T13:52:01.322Z
updated: 2026-05-07T13:52:26.061Z
tags: ["security", "code-review", "ai-coding", "claude-code"]
reading_time: 11
upvotes: 48
comments: 2
language: en
---

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# AI Wars Ep. 3: The Return of the Developer

**[marmelab](https://daily.dev/sources/Marmelab)** · 11 min read · 48 upvotes · 2 comments

## Summary

A developer at Marmelab used Claude Code to build a COBOL admin interface generator from OpenAPI specs, despite having no prior COBOL experience. The experiment revealed key limitations of AI coding agents: they generate insecure code by default (path traversal, XSS, command injection via CALL SYSTEM), fail to identify root causes when fixing bugs, make poor architectural trade-offs without weighing risks, and produce bland UIs. The author argues that developers remain essential for architectural decisions, detecting when AI goes off-rails, enforcing good practices, and taking responsibility for the output. Automated tests proved critical for enabling the AI to iterate independently.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://marmelab.com/blog/2026/05/07/episode-3-the-return-of-the-developer.html>

## Community discussion

Top comments from developers on daily.dev.

**@coin\_spark** · 0 upvotes

> Awesome post Thiery,  I really enjoyed it, thanks for sharing this experience.

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---

Tags: [#security](https://daily.dev/tags/security), [#code-review](https://daily.dev/tags/code-review), [#ai-coding](https://daily.dev/tags/ai-coding), [#claude-code](https://daily.dev/tags/claude-code)

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