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Janusch KozaJK

Janusch Koza

Senior .NET Engineer – Architecture, AI Integration

€650/day
Nürnberg, DE
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Janusch

Senior .NET Architect with 20+ years of experience in business-critical desktop and backend systems. I design, modernize, and operate complex .NET applications – from legacy WPF/WinForms systems to modular ASP.NET Core backends.

Current focus: Integrating AI components (OpenAI, AWS Bedrock, Azure AI, RAG pipelines) into productive .NET architectures – with the same requirements for stability and maintainability as classic system components.

Typical engagements: System modernization (.NET Framework → .NET 9), Architecture work (Clean Architecture, DDD), Performance analysis, AI integration, DevOps automation (GitLab CI/CD, Ansible, Docker).

Hands-on, pragmatic, with technical responsibility from analysis to production operation. Remote or on-site.
  • German

    Native or bilingual

  • Polish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • VinciFi GmbH
    Senior .NET Developer – Backend & AI Integration
    BANKING AND INSURANCE
    February 2026 - March 2026 (1 month)
    Development of a microservice-based processing system for content from social networks (X/Twitter) and news agencies (dpa-compact, dpa-profeed).

    Core tasks: AI-powered classification of incoming content via AWS Bedrock, transformation into structured Markdown format, design of a RAG pipeline for semantic document processing, integration of SQS and Firebase for subscription mechanisms.

    Result: Automated processing pipeline with stable, well-tested microservice components as the foundation for a scalable document and news platform in the FinTech environment.
    AWS Bedrock RAG ASP.NET Core Microservices AI Integration
  • Laboratory for System Research
    Import & Workflow Modernization (Analysis Offer)
    DIGITAL AND IT
    December 2025 - Today (7 months)
    Nürnberg, Germany
    Structured analysis of error-prone import processes in .NET systems – CSV, Excel, XML, JSON. Within 2-3 days, I examine parsing, validation, error handling, and workflow logic, identify concrete bottlenecks, and deliver a prioritized optimization plan.

    The result is a clear document: What is the problem, what does it cost, how will it be fixed. Implementation follows upon request.

    Typical use: Systems with changing formats, large data volumes, or unstable ETL pipelines.
    C# ETL SQL Data Import .NET
  • Laboratory for System Research
    AI Integration for .NET Systems (Analysis Offer)
    DIGITAL AND IT
    December 2025 - Today (8 months)
    Nürnberg, Germany
    Targeted integration of AI models into existing .NET applications – OpenAI, Azure OpenAI, AWS Bedrock, Claude, Gemini, or local LLMs.

    Process: Analysis of suitable use cases in the existing system, design of an integrable architecture concept, delivery of a working PoC. Where appropriate, workflow automations are integrated via n8n.

    Typical use cases: Text classification, document processing, intelligent input assistance, RAG pipelines, automation of editorial or administrative processes.
    LLM OpenAI Azure OpenAI n8n Workflow Automation

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Education

  • Diploma Electrical Engineer
    Electroenergetic Technical College Legnica
    1996

Skill set

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