Senior QA Engineer

September 15, 2026

Remote

Senior

Description

Senior QA Engineer role at Billennium working on a greenfield project building core components for debt servicing and receivables management. The solution follows Domain-Driven Design with autonomous Bounded Contexts and distributed event-driven architecture. The MVP is already in production with the team focused on new functionalities, quality improvements and automation across the ecosystem.

Responsibilities

Design, create and maintain test scenarios and test cases covering functional, regression, integration and UAT testing
Test distributed systems and integrations between services, REST APIs and asynchronous event-driven communication including messaging and queues
Design, implement and maintain automated UI, API and end-to-end tests
Work with C# and .NET using tools and frameworks such as xUnit, Reqnroll and Shouldly
Develop automated tests using Cypress and/or Playwright
Use Testcontainers and tools such as Postman or Apidog for API and integration testing
Integrate automated tests into CI/CD pipelines including GitLab CI/CD and GitHub Actions with Git branching strategies and merge requests
Manage testing activities, reporting and traceability using Jira and Xray
Use Grafana dashboards and alerts to monitor key quality and system indicators such as payment throughput, error rates and asynchronous processing delays
Use SQL and PostgreSQL to validate data and support testing activities
Collaborate closely with Developers and Product Owners to clarify requirements and identify potential quality risks early
Contribute to establishing and improving QA standards, testing practices and automation strategies
Share knowledge and support less experienced QA team members
Leverage AI-powered tools such as Copilot and LLMs to improve QA processes, automation and everyday productivity

Requirements

4-5+ years of professional experience as a Tester/QA Engineer including at least 2 years in a Senior QA role
Strong experience in test automation covering UI, API and/or end-to-end testing
Hands-on experience testing distributed systems and service integrations
Practical experience with REST API testing
Experience with asynchronous communication and event-driven architectures including queues and messaging
Experience creating and maintaining functional, regression and integration tests
Experience using Postman and/or Apidog
Hands-on experience with GitLab CI/CD and/or GitHub Actions including integrating automated tests into pipelines and modifying existing pipelines
Good knowledge of Git including branches and merge requests
Experience with Jira and Xray for test management, reporting and traceability
Practical SQL skills and experience with PostgreSQL
Experience working in Agile environments preferably with Kanban
Experience working on projects following Domain-Driven Design principles
Knowledge of C# and .NET using xUnit, Reqnroll and Shouldly
Experience with Cypress and/or Playwright
Use of Testcontainers for API and integration testing
Docker, Kubernetes and/or OpenShift Container Platform (OCP) experience
Performance testing experience e.g. JMeter or k6
Knowledge of web technologies such as HTML, CSS and JavaScript
BDD methodology knowledge
Proactive approach to analysing business and technical requirements
Strong collaboration skills and willingness to work closely with business stakeholders and development teams
Experience defining quality and testing standards
Experience mentoring or supporting junior QA engineers
Openness to using AI tools and LLM-based solutions in QA, test automation and software delivery

Conditions

Comprehensive benefits including Udemy for Business, private medical care, Multisport card, veterinary package, language lessons and shopping vouchers
Career growth opportunities with partnerships with Microsoft, AWS, Snowflake, Salesforce and more
Innovative and forward-thinking growth-oriented workplace
Team-building events, hackathons and CSR initiatives including annual company event in Mazury
Welcome pack for new employees

C# .NETxUnitReqnrollShouldlyCypressPlaywrightTestcontainersPostmanGitJira XraySQL PostgreSQLGitLab CI/CDGitHub ActionsGrafanadebt servicing and receivables managementDockerKubernetesOpenShift

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