Developers love Claude Code for its ability to quickly write and understand code. However, faster code creation can outpace other software development stages, leading to issues. GitLab addresses this gap by integrating CI/CD, security scanning, and code review. The guide demonstrates fixing a C++ bug using Claude Code, then leveraging GitLab's automated processes. The tutorial shows how GitLab MCP enhances Claude Code's context, pulling in information from issues. Finally, GitLab Duo Agent Platform allows Claude Code to act as an external reviewer, streamlining code review. Custom instructions further guide the agents for specific project needs. Ultimately, Claude Code speeds up coding, while GitLab ensures secure and efficient software delivery.