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Michael HoelzerMH

Michael Hoelzer

MANUAL TESTER | ISTQB | ELECTRICAL ENGINEERING

€500/day
Sofia, BG
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Michael

ISTQB-certified manual hardware and software tester with over 20 years of in-depth electrical engineering expertise and a proven track record in systematic testing of complex technical systems. Specialises in end-to-end testing, system testing and mobile application testing.

CORE COMPETENCIES TESTING & QUALITY ASSURANCE:

🏆 ISTQB Foundation Level Certification - International standards in test methodology
📱 Manual mobile app testing - Android/iOS applications (commissioning and monitoring tools)
🔧 End-to-end testing – Complete system validation from hardware to user experience
⚙️ System testing – Battery storage, heat pumps, fuel cell systems
🤖 Test automation – Robot Framework for recurring test cycles
📊 Test tools – Polarion ASM, Jira, Confluence for professional test documentation


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ISTQB-certified manual hardware and software tester with over 20 years of in-depth electrical engineering expertise and a proven track record in systematic testing of complex technical systems. Specializes in end-to-end testing, system tests, and mobile application tests.

CORE COMPETENCIES TESTING & QUALITY ASSURANCE:

🏆 ISTQB Foundation Level Certification - International standards in test methodology
📱 Manual Mobile App Testing - Android/iOS applications (Commissioning and monitoring tools)
🔧 End-to-End Testing - Complete system validation from hardware to user experience
⚙️ System Tests - Battery storage, heat pumps, fuel cell systems
🤖 Test Automation - Robot Framework for recurring test cycles
📊 Test Tools - Polarion ASM, Jira, Confluence for professional test documentation
  • German

    Native or bilingual

  • English

    Conversational

  • Bulgarian

    Basic

Remote only
Primarily works remotely

Experience

  • Viessmann Holding International GmbH
    Manual Tester for Battery Storage, Heat Pumps, Fuel Cell Heaters and Ventilation Units
    ENERGY AND UTILITIES
    March 2021 - June 2025 (4 years and 3 months)
    Allendorf, Germany
    End2End and system tests on battery storage heat pumps, fuel cells and ventilation units. Testing of apps and web applications (commissioning and monitoring apps)
    Battery Storage Heat Pumps End2End Tests Manual Testing Fuel Cells

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Education

  • ISTQB Certified Tester Foundation Level
    ISTQB Certified Tester Foundation Level
  • State-certified Technician
    Balthasar-Neumann-Schule I
    2003
    Staatlich geprüfter Techniker

Skill set

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