Team:** Engineering Location: Athens Employment type: FullTime

About the company:

KIEFER is building Greece's integrated AI ecosystem. From renewable energy infrastructure and AI systems to robotics and enterprise applications, we connect the technologies that power Europe's intelligent future. Founded in 2014, KIEFER has delivered 600MW+ of energy projects and is now developing sovereign AI infrastructure, enterprise AI products and physical AI systems for Greece and Southeast Europe.

ABOUT THE ROLE:

We are looking for a Senior Software Engineer with strong frontend expertise to take ownership of product surfaces within Sophea Nous, our enterprise AI search and assistant platform.

Sophea Nous connects to the places where a company’s knowledge already lives and allows users to search, receive answers with verified citations, and work with AI assistants and agents. The platform is multi-tenant, self-hosted, and already used by enterprise customers.

You will own features end to end, including the interface, supporting backend, automated tests, release, and production behaviour. You will work closely with a product manager and UI/UX designer from the early stages of product development, helping decide what should be built and how it should work.

This is a large, live codebase that needs to evolve incrementally. The role offers significant technical autonomy and ownership across web, mobile, and desktop. It is not a maintenance role.

Our stack includes TypeScript, React, and Next.js for web, React Native with Expo for mobile, and Electron for desktop. The backend is built with Python, FastAPI, and Celery, using PostgreSQL and Redis. It also includes a retrieval service and an LLM gateway connected to our own GPU infrastructure. Everything runs on Kubernetes.

WHAT YOU WILL DO