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Michael Doerr

@michaeldoerr

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Software Test Engineer specializing in QA, API validation, and SQL-backed troubleshooting.

United States

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What I'm looking for

I’m looking for a QA/Test Engineering role where I can own manual and regression test coverage, drive API validation and SQL-backed investigations, collaborate in Agile, and help improve quality through mentoring and clear defect communication.

I’m a Software Test Engineer with nearly 9 years at Shift4, including about 5 years directly as a QA Engineer. I’m strong in test planning, regression testing, API validation, SQL-backed investigation, usability checks, defect triage, and clear Agile collaboration.

At Shift4, I designed and executed manual, regression, API, and backend test coverage for payment platforms and enterprise transaction systems. I validated UI, API, and database behavior using Postman, JMeter, Katalon/Selenium/Groovy, SQL, logs, Jira, and TestRail—translating requirements into test scenarios and documenting defects clearly.

I also worked as a Technical Advisor and Transaction Operation Specialist, investigating complex processor and transaction issues with trace logs, Splunk, SQL, and cross-system troubleshooting. I mentor trainees, recreate defects with developers and support teams, isolate root causes, and drive practical next steps.

Experience

Work history, roles, and key accomplishments

Transaction Operation Specialist

Shift4 Payments

Dec 2024 - Feb 2025 (2 months)

Investigated complex processor and transaction issues using trace logs, Splunk, and SQL, partnering with engineering and support teams to recreate defects and isolate root causes. Mentored trainees while supporting urgent, financially impactful problems with clear next-step documentation.

Splunk SQL Root Cause Analysis Defect Reproduction Mentoring Technical Documentation Agile Collaboration

QA Engineer

Shift4 Payments

Oct 2019 - Dec 2024 (5 years 2 months)

Designed and executed manual, regression, API, and backend test coverage for payment platforms and enterprise transaction systems. Validated UI, API, and database behavior using Postman, JMeter, Katalon/Selenium/Groovy, SQL, and logs, translating requirements into test scenarios while documenting defects in Jira/TestRail and mentoring QA trainees.

Manual Testing Regression Testing API Testing Postman JMeter Katalon Selenium Jira TestRail

Technical Advisor

Shift4 Payments

Dec 2018 - Oct 2019 (10 months)

Handled escalations involving complex customer, software, device, and transaction issues across support and engineering teams. Documented financially impactful problems with reproducible details, logs, and workflow context to drive practical resolution steps.

Escalation Handling Troubleshooting Repro Steps Log Analysis Cross Functional Collaboration

Customer Support Technician

Shift4 Payments

Jun 2015 - Dec 2018 (3 years 6 months)

Identified, researched, diagnosed, and resolved customer issues in real time across payment devices, software, and account workflows. Built strong customer relationships and mentored trainees, improving troubleshooting consistency through clearer process knowledge.

Customer Support Payment Device Support Requirements Learning Mentoring