Professional IT Consulting & Test Automation
Thomas Sieber - Master of Business Informatics
Over 20 years of experience in test automation, load and performance testing, and software development
There are good reasons for Argument IT
My Services
Test Automation
Development and implementation of automated test frameworks with Selenium, Cucumber, and QF-Test. Creating regression tests for continuous integration.
- GUI test automation
- API testing
- Test framework development
- CI/CD integration
Load & Performance Testing
Professional execution of load and performance tests with JMeter, Gatling, and K6. Analysis and optimization of system performance.
- Load test design
- Performance analysis
- Monitoring setup
- Optimization consulting
Software Development
Full-stack development with Java, Spring Boot, and Angular. Focus on clean architecture and maintainable code.
- Java/Spring Boot backend
- Angular frontend
- REST API development
- Microservices
Project Experience
Successful projects across multiple industries
Logistics & Port Management
Test engineer for container and port logistics systems at a major German logistics company
Banking & Financial Services
Development of mock services and performance tests for a major European bank
Medical Technology
Building automated test frameworks for a medical device manufacturer
Automotive Technology
Implementation of regression and performance tests for an automotive supplier
Expertise from Two Decades of IT Consulting
Digital excellence is no accident, but the result of precise planning. As a Master of Business Informatics, I bridge business requirements and technical implementation.
Holistic View
I see not only the bug, but the architecture.
Tool-Agnostic
Whether Java, Python, or TypeScript - I choose the tool that solves your problem most efficiently.
Certified Quality
As an ISTQB Advanced Level Test Manager, I define top-tier test processes - and implement them in practice as an ISTQB Test Analyst, ISTQB Certified Tester, and ISTQB Performance Testing professional.
Results in Practice
Measurable improvements through structured testing and clean automation
Release Stability
Automated regression tests and significantly increased test coverage.
-35% post-release defectsPerformance
Load testing established, bottlenecks identified and resolved.
+40% throughputCI/CD
Automated pipelines for stable releases and fast feedback cycles.
-50% build timeTechnology Stack
Programming Languages
Testing Tools
Frameworks & Tools
Certifications
ISTQB Advanced Level
Test Analyst
ISTQB Advanced Level
Test Manager
ISTQB Foundation Level
Certified Tester
ISTQB Foundation Level
Performance Testing
Get in Touch
I look forward to your project inquiry. Available for remote projects in German- and English-speaking regions.
