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# Senior Software Engineer (Full-Stack)

- **Company:** Instaffo GmbH
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Amazon Web Services, DevOps, Django Web Framework, Python (Programming Language), Next.js, Web Applications, ReactJS, Flask (Web Framework), Large Language Models, Backend, Fastapi, Kubernetes, Front End Software Development, Terraform, Docker
- **Published:** November 8, 2026
- **Apply:** https://www.adzuna.de/details/5956455873

## About the Role

* Proven track record of building and operating production web applications across the stack, with senior-level experience in a Python backend framework (Django REST Framework, FastAPI or Flask) and in React/Next.js.
 * Strong system design and data modeling skills.
 * Solid DevOps and infrastructure knowledge (Docker, Kubernetes, Terraform, AWS).
 * Hands-on experience integrating LLMs into production systems.
 * Product mindset and a pragmatic, hands-on attitude.

## Description

Please note that this position requires work authorization for Germany.
The language requirements for this position are: English - Conversational (B1-B2).
The estimated salary range from XING does not necessarily correspond to the salary range of this job offer.

We are building the Reha OS, an operating system for rehabilitation that allows clinics to modernize their infrastructure step by step. As a Senior Software Engineer, you will play a pivotal role in transforming our successful product into a comprehensive platform, directly impacting healthcare workflows.
Activities

 * Discover and deliver new modules and features end to end, together with product managers, UX designers and other senior engineers.
 * Design, develop, deploy and operate frontend and backend applications (React/Next.js, Python).
 * Build on our shared platform (patient and case data, permissions, configuration) and extend it where your work needs it.
 * Integrate AI features, from LLM-based assistance to automation, with a high bar for quality and safety.
 * Take part in architecture decisions and document them as architecture decision records.
 * Mentor colleagues and help shape our engineering culture as the team grows.