Freelance Full-Stack Developer Next.js (m/w/d)

The Linear Software GmbH looks back on a 35-year success story in the field of association management and accounting for associations, federations, and schools. After being taken over by the Chapters Group AG in 2025, the company will now be modernized to lead it long-term successfully and technologically into the future.

In this context, the core systems are being transferred to a new cloud product line and the platform is being expanded with agent-based KI features (chatbot, copilot, MCP). For the further development of this new cloud platform, we are looking for an experienced full-stack freelancer who will work closely with the CTO and drive the implementation from the user interface to the database layer. In this role, the focus is clearly on building up this new cloud product line.

Aufgaben

Full-Stack Development: Conceptualization and implementation of performant features with Next.js (React, JavaScript/TypeScript, PostgreSQL, LangGraph).

Frontend-Fokus: Implementation of modern, responsive, and highly interactive user interfaces.

Datenbank-Management: Design, optimization, and connection to SQL databases.

API-Design: Development and integration of seamless, secure APIs for our cloud architecture.

Qualifikation

Senior-Level Next.js: You master the Next.js ecosystem blind and have an excellent eye for clean web implementation and performance (JavaScript, React, Next.js, SQL, git).

End-to-End Skillset: You cover the entire range from interactive UI to solid database management (SQL).

AI-Native Development: You program routinely with KI-supported tools (like Cursor / Claude Code / GitHub Copilot etc.).

Sprache & Rechtliches: Fluent German knowledge and a valid work permit for Germany.

Nice-to-have (Bonus): First practical experience with LLM orchestration frameworks like LangGraph or LangChain is a plus, but not a must.

Benefits

Freier Gestaltungsspielraum: You have the full freedom to choose your development setup and preferred coding AI.

Echte Grüne Wiese: No unstructured legacy – you build the future of our cloud product from scratch.

100% Flexibilität: Completely remote-capable, flexible time scheduling.

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