Middle Test Automation Engineer (C#/.NET)

About the role

In this role, you will combine hands-on technical investigation with test automation to help identify root causes of customer-reported issues and improve product quality through reliable automated testing. You will work on a complex network-oriented product, collaborating with QA and engineering teams to analyze application behavior across multiple components, validate integrations, and support successful product releases.

Responsibilities

• Investigate customer-reported issues by reviewing available evidence, reproducing reported problems, recreating relevant environments and conditions, and narrowing down potential root causes
• Analyze application logs, network traffic captures, API behavior, and database records to understand how issues develop across different components
• Perform hands-on troubleshooting of complex technical issues, distinguishing between product defects, test failures, and environment or network-related problems
• Prepare detailed bug reports, including affected versions and environments, reproduction steps, expected and actual results, and supporting technical evidence
• Develop, maintain, and debug automated tests using C#/.NET
• Investigate failed automated test runs, identify the reasons for failures, and improve test reliability
• Implement regression tests to prevent previously identified issues from reoccurring
• Perform API testing, validate requests and responses, and investigate service integration issues
• Work with the development and QA teams to communicate investigation findings and support issue resolution

Requirements

• Hands-on experience developing, maintaining, and debugging automated tests using C#/.NET and modern test automation frameworks
• Practical knowledge of networking concepts and protocols, including TCP, UDP, DNS, and TLS, with experience using Wireshark for traffic analysis and troubleshooting network-related issues
• Strong analytical and problem-solving skills, with the ability to independently investigate complex issues, test hypotheses, analyze technical evidence, and identify root causes
• Experience testing REST APIs, validating requests and responses, and investigating service integrations; familiarity with GraphQL and Hot Chocolate would be an advantage
• Strong SQL skills and experience querying relational databases to validate application behavior and investigate data inconsistencies; experience with Microsoft SQL Server, PostgreSQL, or MongoDB would be beneficial
• Experience working with Git, CI/CD pipelines, and preferably Azure DevOps Pipelines
• Practical experience working in Windows and Linux environments; familiarity with Playwright, Cypress, or Node.js would be considered a plus
• Ability to document technical findings clearly, prepare detailed bug reports, and collaborate effectively with developers and other QA team members
• Strong Intermediate or higher level of spoken and written English