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Marvin KMK

Marvin K

Senior Software Developer

€900/day
Essen, DE
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Marvin

Are you looking for a developer who understands complex requirements and implements them into stable, scalable solutions? I support companies, startups, and agencies in developing backends, APIs, data pipelines, and AI services that run reliably in production.

How I can specifically help you
• Automation & processing of Excel/CSV data
• Development of high-performance APIs & backend services (C#, .NET, Python)
• Database design & optimization (PostgreSQL, large data volumes)
• AI-powered functions for analysis, text processing & automation
• Cloud deployments & clean DevOps setups (Azure, Containers, CI/CD)


What makes me special
• Pragmatic solutions instead of buzzwords
• Clear communication & cleanly structured code
• Focus on performance, maintainability & scalability
• Experience with complex, production-near systems


Typical projects & results
• Automated data processes → significantly less manual effort
• Fast search & analysis functions across millions of data records
• Robust APIs that grow and remain expandable
• AI features with real benefit, not just demo character

If you are looking for a developer who thinks along, takes responsibility, and delivers reliably, let's talk.
  • German

    Native or bilingual

  • English

    Conversational

Remote only
Primarily works remotely

Experience

  • joinmedia
    Senior Software Developer
    DIGITAL AND IT
    June 2016 - Today (10 years)
    Mülheim (Ruhr), Germany
    C# / .NET: Development & stabilization of REST APIs, worker services, microservices
    • Python: Data processing, automation, imports, scripts
    • APIs: Design, debugging, performance fixes, integration of external services
    • Data & DBs: PostgreSQL, large data volumes, clean imports & queries
    • ML / AI: Training models, fine-tuning, productive integration (not research toys)
    • Cloud & DevOps: Docker, CI/CD, operation & error analysis
    PostgreSQL Microservices ci-cd-management C# API
  • IBM iX
    Software Developer C#
    February 2016 - July 2016 (5 months)
    Düsseldorf, Germany
    Sitecore C# development at ecx.io with a focus on high-performance, scalable web solutions and clean backend architecture.
    C# backend-service-development software-architecture
  • Fraunhofer-Gesellschaft
    Application Developer
    August 2010 - February 2016 (5 years and 6 months)
    Oberhausen, Germany
    Application development at Fraunhofer UMSICHT: Development and maintenance of internal software solutions to support research projects.

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