Billing System Engineer

• Maintain and configure the Comarch BSS platform, particularly Product Catalog, Billing and Billing Mediation
• Monitor platform performance, system jobs, error logs and runtime incidents
• Investigate data issues and identify their root causes
• Monitor system interfaces and integrations to ensure uninterrupted end-to-end data flows
• Support backup and recovery processes and solutions that strengthen system availability
• Configure data connections and integrations and take technical ownership after implementation
• Support audit controls, security requirements and compliance-related activities
• Follow the BSS roadmap, run Proofs of Concept and maintain technical documentation
• Contribute to platform upgrades, patches, new functionalities and technical issue resolution
• Use AI tools to support log analysis, SQL query generation and optimisation, technical documentation and initial diagnosis of system issues

• At least three years of experience with Comarch BSS, particularly Product Catalog, Billing or Billing Mediation
• SQL for data analysis, record tracing and troubleshooting
• At least two years of experience with enterprise system integrations and integration tools
• Understanding of billing processes, including invoicing, rating and usage-based billing
• Familiarity with Oracle or PostgreSQL databases and Elasticsearch
• Practical experience with Linux, REST API testing and Apache Kafka
• English at B2 level or higher
• Experience with enterprise systems such as CRM, ERP, data warehouses or event-streaming solutions is an additional advantage
• Knowledge of Apache Cassandra is an additional advantage
• Knowledge of Kubernetes is an additional advantage
• English proficiency at C1 level is an additional advantage
• Active use of AI tools such as ChatGPT, Claude or GitHub Copilot

• A real impact on the stability, development, and future direction of billing solutions
• Opportunity to work with complex, business-critical systems and solve operational challenges
• Space to bring expertise, propose improvements, and take technical ownership
• Collaboration with experts across technology and business areas in an international environment
• Exposure to a broad technology landscape, including Comarch BSS, system integrations, databases, APIs, and event-driven solutions
• Opportunities to explore new technologies, run Proofs of Concept, and contribute to the further evolution of the billing platform
• Employees can work remotely