Senior AI Systems Engineer (m/f/d)

HalloCharly / Zaitgeist; Berlin; Sur place; EUR 90 000 - 130 000; Plein temps

Avantages offerts par ce poste

28 days of vacation per year

Direct influence on technical vision,

Very exciting growth opportunities

Résumé du poste

HalloCharly / Zaitgeist in Berlin is seeking an experienced AI/ML engineer to design and evolve complex RAG systems for voice and chat bots. You will co-own the system architecture, including continuous evaluation and monitoring, and help build secure cloud infrastructure with a strong emphasis on data protection.

You will continually improve the systems based on concrete user feedback, driving fast prototypes to production with reliable, scalable code and modern tooling.

Qualifications

• ~2 years independently building AI systems (e.g. LLM chatbots, AI-native apps).
• ~2 years with RAG systems and crawling.
• ~5 years with distributed systems and production operations.
• The ability to keep a cool head between speed and substance.
• You build working prototypes fast, use modern coding assistants and LLM tools, and test hypotheses directly on the product.
• Then you turn those solutions into production-ready code with clean architecture, tests, monitoring and high operational reliability.
• Nice-to-have: experience in security-critical or regulated environments.
• Nice-to-have: experience continuously adapting evaluation systems.

Responsabilités

• Design and evolve complex RAG systems for voice and chat bots.
• Co-own the system architecture, including continuous evaluation and monitoring.
• Build secure cloud infrastructure with a strong focus on data protection.
• Keep improving the systems based on concrete user feedback.

Connaissances

Python

FastAPI

TypeScript

Next.js

Tailwind

Docker

AI/ML

PyTorch

vLLM

LLM chatbots

Outils

Supabase

Coolify

Logfire

pydantic-ai

Description du poste

We are a highly specialised tech startup in the heart of Berlin – working on one of the hardest and most relevant problems of our time: bringing artificial intelligence to where it has the biggest leverage – the German state. What we build isn't theory; it's already in use today. Our solutions support more than 1.4 million people across most German federal states – and the number is growing fast. As one of Germany's fastest-growing GovTech startups (50% MoM growth over several months), something genuinely new happens here every day. This is one of those places where hours fly by and weeks feel like months. A lot is happening. We have turned down VC offers so far. So no politics, no theatre – just 100% customer focus. You work directly with the founders (ex-UN, ex-TR, PhDs, German Academic Scholarship Foundation, top-of-class) as part of a small, excellent tech collective with experienced senior advisors. In short: maximum impact, minimum friction. It doesn't get more "streamlined speedboat" than this.

Your Role

Design and evolve complex RAG systems for voice and chat bots

Co-own the system architecture, including continuous evaluation and monitoring

Build secure cloud infrastructure with a strong focus on data protection

Keep improving the systems based on concrete user feedback

Your Profile

A real appetite for startups (corporate mindsets won't be happy here)

~2 years independently building AI systems (e.g. LLM chatbots, AI-native apps)

~2 years with RAG systems and crawling

~5 years with distributed systems and production operations

The ability to keep a cool head between speed and substance

You build working prototypes fast, use modern coding assistants and LLM tools, and test hypotheses directly on the product

Then you turn those solutions into production-ready code with clean architecture, tests, monitoring and high operational reliability

Nice-to-have: experience in security-critical or regulated environments

Nice-to-have: experience continuously adapting evaluation systems

What We Offer

A beautiful, central office right at Rosenthaler Platz

28 days of vacation per year

Direct influence on technical vision, architecture and company growth

Very exciting growth opportunities

On-site interview

• Python
• FastAPI
• Supabase
• Frontend
• TypeScript
• Next.js
• Tailwind
• Cloud
• EU hosting
• Docker
• Coolify
• Logfire
• AI / ML
• pydantic-ai
• PyTorch
• vLLM