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Márk KosztaMK
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Márk Koszta

@mrkkoszta

Manual QA Engineer at Sagemcom testing an AI-based forecasting module and building tools for realistic performance and load testing.

Hungary
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At Sagemcom, I own the test strategy and end-to-end testing for an AI-based forecasting module. I also design integration test strategies across complex system connections and built internal tools to generate and simulate data for performance and load testing.

I investigate complex production issues using SQL and Kibana/Elastic. My work covers testing product modules from requirements analysis through release.

While embedded with the Sagemcom team at Zenitech, I designed integration test scenarios for service data flows and tested APIs with Postman, Swagger, and Python's Requests library. I also automated large test datasets with Python and managed bugs in Jira and Azure DevOps.

At Asura Technologies, I created and ran regression, smoke, and feature test plans, built basic automated tests with Python, Gherkin, and Playwright, and gathered requirements from end users. As a freelance Manual QA Engineer, I tested applications for multiple clients and wrote SOPs to standardize testing processes.

Experience

Work history, roles, and key accomplishments

ZE

Medior Manual QA Engineer

Zenitech

Aug 2025 - May 2026 (9 months)

Worked as an outsourced QA Engineer embedded within the Sagemcom team. Designed structured integration test scenarios covering data flows between platform services, reducing defect leakage into later test stages.

AT

Product Specialist / QA

Asura Technologies

Mar 2024 - Aug 2025 (1 year 5 months)

Created and executed test plans and test cases for regression, smoke, and feature testing. Conducted API testing using Postman and built basic automated tests with Python, Gherkin, and Playwright.

FR

Manual QA Engineer

Freelance

Mar 2023 - May 2024 (1 year 2 months)

Performed manual testing of software applications for multiple clients. Planned and executed test cases, documented development requirements, and authored Standard Operating Procedures to standardize testing processes.

DH

IT Partner Services Representative

Docler Holding

Aug 2022 - Mar 2023 (7 months)

Provided IT partner services support, handling partner inquiries and technical assistance.

Education

Degrees, certifications, and relevant coursework

University of Debrecen logoUD

University of Debrecen

Bachelor of Science, Computer Science Engineering

2024 -

Pursuing a degree in Computer Science Engineering at the University of Debrecen, expected to continue beyond the current date.

University of Debrecen logoUD

University of Debrecen

Certificate, Deep Learning

2025 - 2025

Completed the NVIDIA Fundamentals of Deep Learning certificate at the University of Debrecen in April 2025.

TR

Training360

Certificate, Software Testing

2023 - 2023

Completed the Junior Software Tester certificate at Training360 in January 2023.

RU

Ruander

Certificate, Frontend Development

2022 - 2022

Completed the Junior Frontend Developer certificate at Ruander in October 2022.

BS

Bethlen Gábor Economic Technical School

High School Diploma, Advanced Mathematics

2011 - 2015

Completed graduation in Advanced Mathematics Class at Bethlen Gábor Economic Technical School from 2011 to 2015.

Tech stack

Software and tools used professionally

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