All positions
Leadership
Engineering
AI / ML
Founding Fullstack Engineer (m/f/d)
Berlin, Germany
Full-time
Zaitgeist Innovation Group GmbH
Apply now
About the Job
We're a highly specialized tech startup in the heart of Berlin — working on one of the most relevant challenges of our time: bringing AI where it has the greatest impact — into the German public sector. What we build isn't theory. It's live, in production, available to more than 1 million people across most German federal states — and growing fast. As one of Germany's fastest-growing GovTech startups (50% MoM growth over several months), something genuinely new happens here every single day. Hours fly by, weeks feel like months. No politics, no theatre — just 100% customer focus. In short: maximum impact, minimum friction.
Your Role
Own the technical vision and architecture across the full platform — from the real-time voice pipeline to the multi-tenant chat products
Drive our applied AI roadmap: LLM agents (pydantic-ai), RAG over pgvector, agentic crawling and evaluation systems for LLM accuracy
Solve real scaling and reliability challenges for citizen-facing telephony: real-time processing, latency, uptime and horizontal scaling
Own multi-tenant data isolation, security and DSGVO/GDPR compliance on a Postgres foundation (RLS, zero-trust access, migration discipline)
Partner with the founders on product strategy, technical trade-offs and the long-term architecture of the company
Lead, grow and mentor a small, senior engineering team across multiple services in Python and TypeScript, and set the hiring bar as we scale
Your Profile
Proven experience leading and growing engineering teams, with a strong hands-on technical foundation you haven't left behind
Deep experience building and operating production systems in Python and/or modern TypeScript/React
Applied AI experience: LLM agents, RAG, and evaluation — you've shipped these to real users, not just prototyped them
Strong instincts for multi-tenant data isolation, security and EU data protection (DSGVO/GDPR)
A reliability engineering mindset for real-time, latency-sensitive, citizen-facing services
The judgment to balance speed and substance — you ship fast prototypes, then harden them into robust, well-architected systems
Nice-to-have: experience in regulated, security-critical, or public-sector environments
Nice-to-have: German language proficiency
What We Offer
Competitive salary
A defining leadership role at one of Germany's fastest-growing GovTech startups
Direct influence on technical vision, architecture and company growth
A beautiful and central office right at Rosenthaler Platz
28 days of vacation per year
Our Application Process
01
Application to info@zaitgeist.com
02
Short phone screen
03
On-site interview
Tech Stack
Backend
Python
FastAPI
PostgreSQL
Supabase
Frontend
React
TypeScript
Next.js
Tailwind
Cloud
EU hosting
Docker
Coolify
Logfire
AI / ML
pydantic-ai
PyTorch
vLLM
pgvector
Ready for the next step?
We look forward to meeting you. Send us your application with your
CV and relevant projects or code samples.
Important note on your application:
To filter out AI-generated applications, please start your cover letter or
message with „Hallo Zaitgeist-Team“.
Leadership
Engineering
AI / ML
Berlin, Germany
Full-time
Zaitgeist Innovation Group GmbH
Apply now
About the Job
We're a highly specialized tech startup in the heart of Berlin — working on one of the most relevant challenges of our time: bringing AI where it has the greatest impact — into the German public sector. What we build isn't theory. It's live, in production, available to more than 1 million people across most German federal states — and growing fast. As one of Germany's fastest-growing GovTech startups (50% MoM growth over several months), something genuinely new happens here every single day. Hours fly by, weeks feel like months. No politics, no theatre — just 100% customer focus. In short: maximum impact, minimum friction.
Your Role
Own the technical vision and architecture across the full platform — from the real-time voice pipeline to the multi-tenant chat products
Drive our applied AI roadmap: LLM agents (pydantic-ai), RAG over pgvector, agentic crawling and evaluation systems for LLM accuracy
Solve real scaling and reliability challenges for citizen-facing telephony: real-time processing, latency, uptime and horizontal scaling
Own multi-tenant data isolation, security and DSGVO/GDPR compliance on a Postgres foundation (RLS, zero-trust access, migration discipline)
Partner with the founders on product strategy, technical trade-offs and the long-term architecture of the company
Lead, grow and mentor a small, senior engineering team across multiple services in Python and TypeScript, and set the hiring bar as we scale
Your Profile
Proven experience leading and growing engineering teams, with a strong hands-on technical foundation you haven't left behind
Deep experience building and operating production systems in Python and/or modern TypeScript/React
Applied AI experience: LLM agents, RAG, and evaluation — you've shipped these to real users, not just prototyped them
Strong instincts for multi-tenant data isolation, security and EU data protection (DSGVO/GDPR)
A reliability engineering mindset for real-time, latency-sensitive, citizen-facing services
The judgment to balance speed and substance — you ship fast prototypes, then harden them into robust, well-architected systems
Nice-to-have: experience in regulated, security-critical, or public-sector environments
Nice-to-have: German language proficiency
What We Offer
Competitive salary
A defining leadership role at one of Germany's fastest-growing GovTech startups
Direct influence on technical vision, architecture and company growth
A beautiful and central office right at Rosenthaler Platz
28 days of vacation per year
Our Application Process
1
Application to info@zaitgeist.com
2
Short phone screen
3
On-site interview
Tech Stack
Backend
Python
FastAPI
PostgreSQL
Supabase
Frontend
React
TypeScript
Next.js
Tailwind
Cloud
EU hosting
Docker
Coolify
Logfire
AI / ML
pydantic-ai
PyTorch
vLLM
pgvector
Ready for the next step?
We look forward to meeting you. Send us your application with your CV and relevant projects or code samples.
Important note on your application:
To filter out AI-generated applications, please start your cover letter or message with „Hallo Zaitgeist-Team“.
Apply now