> For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt.

# Themelio Web

> **Themelio compatibility reference.** This page describes the retained Themelio implementation or its historical design. Check the [parallel-operation guide](/compatibility/index.md) before applying it to the current platform.

Themelio Web is the primary application service in the Themelio stack. Built with Next.js 15 and React 19, it serves both the user-facing interface and the API layer. It handles authentication (NextAuth v5), session management (Valkey), and proxies authenticated requests to GitLab using middleware-injected impersonation tokens. Located at `services/web` in the monorepo.

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