Alle Stellen
Leadership
Engineering
KI / ML
Founding Fullstack Engineer (m/w/d)
Berlin, Deutschland
Vollzeit
Zaitgeist Innovation Group GmbH
Jetzt bewerben
Über den 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, used by over 1,300,000 people across 8 federal states every day — and growing fast. As one of Germany's fastest-growing GovTech startups (50% MoM growth over several months, currently at ~375k € ARR), 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
Dein Profil
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
Was wir bieten
Competitive salary with significant equity — this is a founding-team role, weighted toward ownership
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
Unser Bewerbungsprozess
01
Informal application with CV to info@zaitgeist.com
02
First interview with the founders
03
Technical deep-dive & architecture discussion
04
Culture & team fit
Tech Stack
Backend
Python
FastAPI
PostgreSQL
Redis
Frontend
React
TypeScript
Next.js
Cloud
AWS
Docker
Kubernetes
Terraform
AI / ML
PyTorch
Hugging Face
LangChain
MLflow
Bereit für den nächsten Schritt?
Wir freuen uns darauf, dich kennenzulernen. Schick uns deine Bewerbung mit
Lebenslauf, relevanten Projekten oder Code-Beispielen.
Wichtiger Hinweis zur Bewerbung:
Um KI-Bewerbungen auszufiltern, beginne dein Anschreiben oder
deine Nachricht bitte mit „Hallo Zaitgeist-Team“.
© 2026 Zaitgeist Innovation Group GmbH. Alle Rechte vorbehalten.
Leadership
Engineering
KI / ML
Founding Fullstack Engineer (m/w/d)
Berlin, Deutschland
Vollzeit
Zaitgeist Innovation Group GmbH
Jetzt bewerben
Über den 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, used by over 1,300,000 people across 8 federal states every day — and growing fast. As one of Germany's fastest-growing GovTech startups (50% MoM growth over several months, currently at ~375k € ARR), 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
Dein Profil
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
Was wir bieten
Competitive salary with significant equity — this is a founding-team role, weighted toward ownership
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
Unser Bewerbungsprozess
1
Informal application with CV to info@zaitgeist.com
2
First interview with the founders
3
Technical deep-dive & architecture discussion
4
Culture & team fit
Tech Stack
Backend
Python
FastAPI
PostgreSQL
Redis
Frontend
React
TypeScript
Next.js
Cloud
AWS
Docker
Kubernetes
Terraform
AI / ML
PyTorch
Hugging Face
LangChain
MLflow
Bereit für den nächsten Schritt?
Wir freuen uns darauf, dich kennenzulernen. Schick uns deine Bewerbung mit Lebenslauf, relevanten Projekten oder Code-Beispielen.
Wichtiger Hinweis zur Bewerbung:
Um KI-Bewerbungen auszufiltern, beginne dein Anschreiben oder deine Nachricht bitte mit „Hallo Zaitgeist-Team“.
Jetzt bewerben
© 2026 Zaitgeist Innovation Group GmbH. Alle Rechte vorbehalten.