Yeliz Kosar

Business Analyst | @ALJ Finansman

Istanbul, Türkiye

About

I am a detail-oriented Data QA Engineer with strong expertise in big data validation, automation, and enterprise-level deployments within Hadoop-based security data platforms. With over 7 years of professional experience working with U.S.-based teams in New York and New Jersey, I specialize in ensuring data accuracy, system reliability, and high-quality delivery across large-scale data ecosystems. Some highlights of my qualifications and experience: - Linux (Job execution, system monitoring, API testing) - Big Data Technologies: Hadoop, Cloudera, HDFS, Impala, Hive, HBase, Spark - Database Management: MySQL, Impala, HBase - API Testing & Automation: Python, Pytest, Behave, REST Assured, Postman - CI/CD & Deployment: Jenkins, Ansible, Autosys, Maven - Version Control & Collaboration Tools: Git, GitHub, Bitbucket, Wiki Docs - Log Analysis & Debugging: WinSCP, SuperPutty - Testing Expertise: Black-box Testing (System, System Integration, Smoke, Regression, Ad-hoc) - Agile & Team Management: Experienced in all phases of Agile (Scrum), Team Leading experience - Test Management & Bug Tracking: JIRA Passionate about ensuring data integrity, automating processes, and optimizing deployment workflows to enhance system efficiency and reliability.

Experience

  • Relocation at Career Break
    Nov 2025 - Apr 2026 · 6 mos

    After eight years of professional experience in the United States, I relocated to Türkiye in November 2025. During this transition period, I focused on completing my international move and establishing local work arrangements. At the same time, I continued my professional development by strengthening my knowledge of enterprise data platforms, AI/ML, business analysis practices, SQL-based data analysis, and data governance processes. This period also allowed me to stay current with industry best practices and prepare for my next professional opportunity within global and cross-functional technology environments.

  • QA Consultant at Bank of America
    Mar 2023 - Oct 2025 · 2 yrs 8 mos

  • Quality Assurance Engineer at Citi
    Mar 2022 - Feb 2023 · 1 yr

  • Data Specialist at Khalpera
    Apr 2018 - Jan 2022 · 3 yrs 10 mos