Freelancer profile translated to English.

Description

I am a senior software engineer with a focus on backend systems, real-time communication, and AI integration. In several lead and first engineer roles, I have built products from initial architecture to production-ready implementation – including in the regulated fintech sector and currently in the field of Real-Time Voice AI.

I typically work as a senior individual contributor: I dive into unclearly defined, technically challenging problems, make viable architectural decisions, and deliver robust, maintainable systems – with technical influence as a peer, without needing a pure leadership role. My working method is deliberately pragmatic and low-complexity: clear, long-lasting solutions instead of overloaded abstractions.

Focus areas:

• Scalable backend systems with TypeScript and Node.js (NestJS)

• Real-time and event-driven architectures (including VoIP/telephony, streaming, durable state machines)

• Integration of AI/LLM and voice technologies (STT/TTS, LLM orchestration) into productive workflows

• Development in regulated environments: security and compliance-conscious (GDPR, sensitive data)

• Independent work in flat, autonomous team structures

Stack: TypeScript, Node.js, NestJS, Bun, PostgreSQL, event-driven architecture, Cloud/Infra ([e.g., Hetzner, Docker]).

I undertake freelance projects with a focus on TypeScript/Node.js backends, real-time communication, and AI integration – preferably remote.

Industry field of expertise

Languages

German
Native or bilingual
English
Native or bilingual

Workplace preferences

Can work on-site

Nürnberg (up to 50km)

0815 Software
Founder
DIGITAL AND IT
April 2026 - Today (4 months)
As the founder and responsible developer of 0815 Software UG, I am currently building Callura – an AI-native voice agent platform for telephony in the German SME sector. This project is my current demonstration of sophisticated real-time and AI system development from scratch.

Technical Focus Areas:
• Real-time audio pipelines: Telephony integration via Telnyx, audio resampling, and low-latency streaming processing
• Integration of LLM and voice APIs (STT/TTS/LLM) into productive conversation flows
• Event-driven architecture and durable state machines for reliable, multi-stage processes
• AI orchestration: deterministic core with limited agentic components
• GDPR and compliance-conscious design when handling sensitive data (AVV, EU data residency, EU AI Act)
Stack: TypeScript, Bun, NestJS, Telnyx, Hetzner, event-driven architecture.

I typically take on the role of a senior individual contributor: I dive into unclearly defined, technically challenging problems and deliver maintainable, production-ready systems. My working method is deliberately pragmatic and low-complexity – clear solutions instead of overloaded abstractions.

Particularly relevant for freelance projects in: Real-time communication (VoIP/telephony), AI/LLM integration, TypeScript/Node.js backends.
Artificial Intelligence AI Automation SAAS TypeScript
Penzilla GmbH
Lead Software Engineer
May 2024 - February 2026 (1 year and 9 months)
As an early senior engineer at Penzilla, an insurtech company, I was instrumental in building the platform – from architecture to production-ready implementation.

I typically take on the role of a senior individual contributor: I dive into unclearly defined, challenging problem statements and deliver robust, maintainable systems – with technical influence as a peer, without needing a pure leadership role.

Focus areas:
• Design and implementation of scalable backend systems with TypeScript and Node.js (NestJS)
• Conception of APIs, data models, and business logic in the regulated insurance environment
• Integrations into payroll and HR systems
• Security and compliance-conscious development (GDPR, sensitive personal data)
• Technical architectural decisions in an autonomous, flatly organized team

My working method is deliberately pragmatic and low-complexity: clear, maintainable solutions instead of overloaded abstractions. I work most effectively in self-directed structures with direct access to the problem.
TypeScript NestJS Amazon Web Services React.js
TheMakers.ai GmbH
Technology Lead
AGRICULTURE
April 2022 - Today (4 years and 3 months)
Berlin, Germany
Design and implementation of
- ...microservice Architecture
- ...CQRS / REST patterns in different business domains
- ...Event-Sourcing in core domains
- ...Event-Based services
- ...Angular Web-Client
- The system was designed following DDD principles