Founding Fullstack Engineer (m/f/d)

HalloCharly / Zaitgeist; Berlin; Vor Ort; EUR 90.000 - 140.000; Vollzeit

Benefits dieser Stelle

Central Berlin office at RosenthalerPl

28 days vacation

Leadership role with impact

Direct influence on technical vision

Zusammenfassung

HalloCharly / Zaitgeist in Berlin is seeking a senior engineering leader to drive our applied AI roadmap, building LLM agents, RAG pipelines, and production-grade evaluation systems.

You will guide a small, senior team across Python and TypeScript, ensuring multi-tenant data isolation, GDPR compliance, and reliable, latency-sensitive citizen-facing services, while partnering with the founders on architecture and product strategy.

Qualifikationen

• Experience leading engineering teams.
• Production systems in Python and/or TypeScript/React.
• Applied AI experience: LLM agents, RAG, evaluation.
• Strong focus on multi-tenant data isolation and GDPR.
• Reliability mindset for real-time, latency-sensitive services.

Aufgaben

• Drive AI roadmap: LLM agents, RAG, evaluation systems.
• Solve scaling and reliability challenges for citizen-facing telephony.
• Enforce data isolation and GDPR compliance on Postgres (RLS, zero-trust).
• Collaborate with founders on product strategy and long-term architecture.
• Lead and mentor a senior engineering team across Python and TypeScript; set hiring bar.

Kenntnisse

Team leadership

Hands-on engineering

Python

TypeScript

React

System design

MLOps

Tools

FastAPI

Supabase

Next.js

Tailwind

Docker

PyTorch

pydantic-ai

vLLM

PGVector

Jobbeschreibung

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 1.4 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

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

What We Offer

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

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