Billing System Engineer (Comarch BSS)

Location: Remote from Kraków, Poland

Company

hirify.global is part of InPost, a European out-of-home e-commerce logistics platform operating parcel machines, pick-up and drop-off points, courier, and fulfilment services across nine European countries.

What you will do

• Maintain and configure the Comarch BSS platform, including Product Catalog, Billing, and Billing Mediation.
• Monitor platform performance, system jobs, error logs, runtime incidents, interfaces, and integrations.
• Investigate data issues, trace root causes, and ensure uninterrupted end-to-end data flows.
• Support backup and recovery processes, availability improvements, audit controls, security requirements, and compliance activities.
• Configure data connections and integrations, taking technical ownership after implementation.
• Follow the BSS roadmap, run Proofs of Concept, maintain technical documentation, and contribute to upgrades, patches, new functionality, and issue resolution.

Requirements

• At least three years of experience with Comarch BSS, particularly Product Catalog, Billing, or Billing Mediation.
• SQL experience 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 and Polish at B2 level or higher are required.

Nice to have

• Experience with CRM, ERP, data warehouses, or event-streaming solutions.
• Knowledge of Apache Cassandra or Kubernetes.
• English proficiency at C1 level.
• Active use of AI tools such as ChatGPT, Claude, or GitHub Copilot for log analysis, SQL generation and optimisation, documentation, and initial issue diagnosis.

Culture & Benefits

• Full-time B2B contract.
• Work with complex, business-critical billing systems and contribute to their stability and future direction.
• Technical ownership, improvement proposals, Proofs of Concept, and exposure to Comarch BSS, integrations, databases, APIs, and event-driven solutions.
• Collaboration with technology and business experts in an international environment.

Hiring process

• Applications are reviewed confidentially; only candidates whose qualifications and experience best match the requirements will be contacted.