Billing 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:

Billing Testing Specialist focused on validating billing systems through manual and automated testing, identifying defects, supporting test automation initiatives, and contributing to the delivery of reliable and high-quality software.

Role insights:

• Design and implement automated test cases and test plans for Billing Applications.
• Maintain and improve existing automation suites with guidance from senior team members.
• Support integration of automated tests into CI/CD pipelines.
• Review and understand requirements and technical documentation.
• Plan and execute test scenarios and test cases across functional areas.
• Perform performance, operational, and serviceability testing.
• Identify, document, and track defects.
• Support troubleshooting of system and customer-related issues.
• Provide feedback to improve functionality and system quality.
• Collaborate with QA team members, developers, and business stakeholders.
• Contribute to improvement of testing processes and automation.
• Perform manual and exploratory testing where needed.

What makes you unique:

• First experience in software testing, including test execution and basic test design.
• Familiarity with test management and tracking tools (e.g., Jira, Confluence).
• Basic understanding of databases and ability to write simple SQL queries.
• Working knowledge of Linux/Unix environments for testing activities.
• Initial experience with test automation using Java or Python is a plus.
• Understanding of API and integration testing (e.g., REST, SOAP, XML).
• Experience with version control systems (e.g., Git).
• Basic understanding of CI/CD processes and tools (e.g., Jenkins).
• Good command of English (spoken and written).
• Analytical mindset and willingness to learn new technologies.
• Structured and reliable way of working with attention to detail.
• Proactive approach and interest in improving testing processes and automation.

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.