Descriptions:
Sam Witteveen walks through JetBrains’ Junie coding agent in this sponsored deep-dive, positioning it as a deliberate alternative to vibe-coding tools for professional developers who need reliable AI assistance within existing codebases. Unlike standalone coding assistants, Junie is embedded directly into JetBrains IDEs—IntelliJ IDEA, PyCharm, WebStorm, and others—giving it deep awareness of language-specific conventions and project architecture from the start.
The video demonstrates a real-world migration project: converting a Gemini Live API demo into a Next.js app and adding customer support features along the way. Witteveen shows how Junie’s ask mode lets developers query the codebase and plan changes before writing any code, contrasting it with the more autonomous brave mode that executes broadly but still pauses before running sensitive terminal commands. The iterative plan-act-verify loop is shown in action, including how Junie identified and fixed a CSS bug introduced during the framework conversion.
Key features covered include auto-generated project guidelines saved as markdown files (analogous to an agent rules file), MCP support, a synced markdown editor for reviewing documentation, and think mode for deeper reasoning. Witteveen makes a particular case for Junie’s value in team onboarding scenarios, where developers can ask natural-language questions about unfamiliar codebases before making changes—offering a meaningful contrast to tools that simply generate code from scratch.
📺 Source: Sam Witteveen · Published December 10, 2025
🏷️ Format: Tutorial Demo
