Aram and Eduard, the co-founders of Modelence (YC S25), launched a new full-stack app builder. They built it to streamline the development process, removing the need to repeatedly implement authentication, database management, and API integrations. The framework leverages TypeScript and MongoDB for a more efficient coding experience, especially for AI-driven applications.

Modelence aims to simplify AI app development, acknowledging the challenges inherent in the platform itself. The framework uses TypeScript to provide guardrails and catch errors during build time. MongoDB eliminates schema management issues that frequently trip up AI agents. Built-in features handle authentication, databases, and cron jobs, allowing developers to focus on product logic.

The platform includes a cloud-based backend and a built-in DevOps agent. The agent will leverage observability data to address errors, alerts, and incidents. Currently, users can test the app builder with a prompt on the landing page, then continue working in their own IDE. Modelence is focusing on the framework and platform, believing this is key to AI coding.

Modelence's approach of combining TypeScript and MongoDB is a smart design choice. The integration of the Claude Agent SDK is interesting, and the use of TypeScript's type system to improve agent self-correction is a key differentiator. The team plans to add custom external packages to extend the authentication features. This positions Modelence as a promising tool for developers.