Billing Senior Testing Specialist (f/m/d) @ A1 Competence Delivery Center

Strength. Care. Growth

A1 Competence Delivery Center is a vital component of A1’s telecommunications business. Acting as an expertise hub, CDC is dedicated to delivering a full range of high-quality IT, network, financial and other services to support A1’s operations across all OpCos, independent of location.

Using the power of being OneGroup and leveraging synergies, CDC enables transparency of resources, key skills and knowledge expansion and personal career growth opportunities’ enhancement, paired with job stability.

You will know we are the right place for you, if you are driven by:

• Opportunities to learn and build your career.
• Meaningful work in a stable and fast-paced company.
• Diversity of people, projects, and platforms.
• A supportive, fun, and inspiring place to work.

Role Overview:

Responsible for ensuring the quality, reliability, and performance of Billing Applications by designing and automating test solutions, integrating testing into CI/CD pipelines, managing defects, and driving continuous improvement across testing processes and quality standards.

Role insights:

• Design and evolve automated test strategies, test cases, and test plans for Billing Applications.
• Own and maintain automation frameworks and test suites.
• Integrate automated tests into CI/CD pipelines.
• Analyze and challenge requirements to ensure testability and quality.
• Define and execute complex test scenarios across functional and non-functional areas.
• Execute performance, reliability, and serviceability tests.
• Identify, track, and manage defects with development teams.
• Troubleshoot complex system and customer issues with support and engineering teams.
• Provide feedback to improve system quality, stability, and performance.
• Collaborate with Test Managers, Developers, Business Analysts, and stakeholders.
• Drive continuous improvement of testing processes and automation.
• Support manual and exploratory testing where needed.

What Makes You Unique:

• 3–5 years of experience in software testing, including test design and execution.
• Experience with test management and tracking tools (e.g., Jira, QC, Confluence).
• Experience in database testing, including writing SQL queries and understanding stored procedures.
• Solid Linux/Unix skills for test execution and troubleshooting.
• Experience with test automation using Java or Python.
• Understanding of API and integration testing (e.g., XML, SOAP/REST).
• Experience with CI/CD tools such as Jenkins and integration of automated tests.
• Analytical mindset with strong problem-solving skills.
• Structured and reliable way of working with high attention to detail.
• Proactive approach to improving test processes, automation, and quality standards.

Our gratitude for the job done will be eternal, but we’ll also offer you:

• Valuable experience in one of the fastest-growing and most innovative industries.
• Challenging assignments with strong opportunities for personal and professional growth in a multinational environment.
• Hybrid working model supporting a healthy work-life balance.
• Thousands of online and in-person Learning opportunities for you to grow.
• Modern, open, and friendly work environment that fosters continuous learning and the development of both technical and soft skills.
• Special employee tariffs and a wide range of attractive employee benefits.

If you have any questions, please do not hesitate to contact Svetlina Vazharova.