Martin Siegling

Senior Fullstack Software Engineer & AI Integration Expert

I am a freelance Senior Fullstack Software Engineer with over 25 years of experience developing complex web and backend systems. My focus is on React, Next.js, TypeScript, Node.js and scalable microservice architectures. I also integrate GDPR-compliant AI/LLM solutions with Azure OpenAI (EU), Mistral, and Hugging Face.
Available for remote engagements across Europe · GDPR-ready AI/LLM · Vector Search (pgvector) · Chatbots

Request project

Consulting & Development

  • Frontend & Fullstack: React, Next.js, TypeScript, Node.js, REST, GraphQL
  • AI/LLM Integration (GDPR-ready): Azure OpenAI (EU), Mistral, Hugging Face, Retrieval-Augmented Generation
  • Vector Search & Data: PostgreSQL + pgvector, Prisma, ingestion for PDFs/SharePoint/CRMs
  • Security & Compliance: Auth.js/OAuth2, RBAC, audit logs, token usage analytics
  • DevOps & Deployment: Docker, CI/CD (GitHub Actions, GitLab), Vercel, Cloud integration

Selected Projects

AI-powered Intranet Platform (TÜV Rheinland)

Developed a platform to manage AI-powered chatbots with document uploads, vector search, and real-time streaming chat. Integrated Azure/OpenAI/Mistral, connected SharePoint, GDPR-compliant logging. Stack: React, Next.js, TypeScript, Node.js, PostgreSQL (pgvector), Prisma.

FinForecast – Personal Financial Planning App

A Next.js/TypeScript/Node.js app for personal financial planning, built with Auth.js, Prisma and PostgreSQL. Focus on performance, clean architecture, and later AI-powered analytics & visualizations.

MediaMarkt/Saturn – GDPR Consent & Tracking

Implemented GDPR-compliant consent layers for e-commerce shops, built a server-side tracking pipeline, maintained legacy pages via a standalone library (GTM). Stack: React, TypeScript, Node.js, Styled Components, GraphQL.

Language Learning Platform (Learnship/XaaSify)

Built an HTML5-based language learning platform with WebRTC, multi-tier microservices backend (Scala/Akka/Kafka/Cassandra), and React/TypeScript frontend. Focused on reliability and scalability.

Additional references (2000–2016) mostly in the banking & logistics sector using Java/JEE/Spring, SOAP/REST, Oracle, JSF/Struts – details on request.