This post is for Day 4 of Mercari Advent Calendar 2025, brought to you by @whhygee from the Mercari Enablement Tools & I

Mercari's platform is a resource for developers and technology enthusiasts, offering insights into engineering challenges, technology stack, and culture at Mercari. Through articles, tech talks, and open-source contributions, Mercari offers insights into building innovative and scalable technology solutions. Developers can learn about Mercari's engineering culture, agile methodologies, and contributions to the broader tech community.

Mercari Engineering

Mercari built Single Front Door (SFD), a unified platform interface that consolidates multiple developer tools and workflows into a single entry point. The system uses Argo Workflows to execute GitOps operations through CLI or AI-powered IDE integrations via Model Context Protocol. Key technical challenges included implementing OAuth-based credential management to maintain proper access control at scale, and configuring IAM with Kubernetes RBAC for secure access to external services like GCP and GitHub. The platform aims to become a modular workflow engine with reusable building blocks for infrastructure provisioning, service configuration, and CI/CD operations.

Enhancing Developer Experience through Mercari’s Unified Platform Interface