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Marian Mrozek

@marianmrozek

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I maintain and enhance IBM COBOL mainframe applications, backed by a decade optimizing industrial automation.

Poland

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What I'm looking for

I'm looking to continue building innovative, reliable mainframe solutions, combining IBM COBOL development, testing, debugging, and agile teamwork to improve system stability and processes.

At DATAGROUP, I maintain and enhance mainframe applications using IBM COBOL, helping keep systems stable through source-code testing and debugging.

I work in an agile Scrum team and contribute to process optimization while delivering reliable mainframe solutions.

Before moving into mainframes, I spent more than a decade supporting, programming, and optimizing advanced industrial robots and automated machines at Tenneco Rybnik.

I'm driven by technical precision, collaborative problem-solving, and resolving critical system failures under time pressure.

Experience

Work history, roles, and key accomplishments

Current

Junior Mainframe Consultant

Current

DATAGROUP

Feb 2024 - Present (2 years 7 months)

* Wartung und Weiterentwicklung von Mainframe-Anwendungen mittels IBM COBOL.
* Testen und Debuggen von Quellcode zur Sicherung der Systemstabilität.
* Aktive Mitarbeit in einem agilen Team nach Scrum-Methodik.

COBOL Mainframe Testing Debugging Scrum Agile

machine operator - a specialist for robots, machines and tools

Tenneco Rybnik

Apr 2014 - Jan 2024 (9 years 9 months)

* Betreuung, Programmierung und Optimierung von hochentwickelten Industrie-Robotern und Automaten.
* Schnelle Problemlösung bei kritischen Systemausfällen unter hohem Zeitdruck.

Machine Operator

Tenneco Automotive Eastern Europe

Oct 2011 - Apr 2014 (2 years 6 months)

Worked as Machine Operator at Tenneco Automotive Eastern Europe.

Education

Degrees, certifications, and relevant coursework

Software Development Academy

Software tester

2021 - 2021

-introduction to software testing;
- types of testing;
- test design techniques;
- risk-based testing;
- testing tools in software testing: Jira, TestRail;
- software testing in practice;
- methodologies: Agile, Scrum;
- basics of relational databases;
- introduction to programming: Java;
- BDD methodology testing;
- basics of test automation: Selenium WebDriver;
- preparation to ISTQB Foundation