Billing System Engineer (m/f/n)

InPost UK; Kraków; On-site; PLN 120,000 - 180,000; Full time

Job summary

InPost UK is seeking a Billing System Engineer to help us develop and ensure the stability of our billing systems, closely with the Comarch BSS platform.

You’ll work in a complex system environment, diagnose root causes, and influence the reliability, upgrades, and technical documentation of our billing solutions.

Join an international tech team and contribute to end-to-end data flows, security controls, and compliant invoicing across Europe.

Qualifications

• Experience with Comarch BSS modules: Product Catalog, Billing or Billing Mediation.
• Proficient in SQL for data analysis and troubleshooting.
• Experience with enterprise system integrations and integration tools.
• Understanding of invoicing, rating and usage-based billing.
• Familiar with Oracle or PostgreSQL and Elasticsearch.
• Experience with Linux, REST API testing and Apache Kafka.
• English communication at least B2 level.

Responsibilities

• Maintain and configure the Comarch BSS platform, incl. Product Catalog, Billing and Billing Mediation.
• Monitor platform performance, jobs, logs and runtime incidents.
• Investigate data issues and identify root causes.
• Monitor interfaces and integrations to ensure end-to-end data flows.
• Support backup, recovery processes and high availability.
• Configure data connections and integrations and own implementation.
• Support audit controls, security requirements and compliance activities.
• Follow the BSS roadmap, run PoCs and maintain technical documentation.
• Contribute to platform upgrades, patches, and new functionalities.

Skills

Comarch BSS

SQL

System integration

Billing processes

English (B2+)

Tools

Oracle

PostgreSQL

Elasticsearch

Linux

REST API testing

Apache Kafka

Job description

InPost has revolutionised e-commerce parcel delivery in Poland and is now one of Europe’s leading out-of-home (OOH) e-commerce enablement platforms. Founded in 1999 by Rafał Brzoska, InPost provides delivery services through a network of over 64,000 Automated Parcel Machines (APMs) and more than 30,000 pick-up and drop-off (PUDO) points across nine European countries: Poland, the United Kingdom, France, Italy, Spain, Portugal, Belgium, the Netherlands and Luxembourg, alongside to-door courier and fulfilment services for ecommerce merchants.

InPost’s extensive OOH network supports rapidly growing parcel volumes across its markets, with 1.4 billion parcels delivered in 2025. Its locker solutions offer consumers a delivery option that is cheaper, more flexible and convenient, environmentally friendly and contactless. As a leading OOH logistics provider, InPost is recognised for transforming parcel delivery economics in Europe, appealing to both consumers and merchants through its flexible, technology-driven solutions.

Job Description

We’re looking for a Billing System Engineer who will help us develop and ensure the stability of our billing systems. In this role, you’ll work closely with the Comarch BSS platform, combining technical expertise with a good understanding of business processes.

This is a role for someone who enjoys working in a complex system environment, likes getting to the root cause of issues, and wants to have a real impact on the reliability and further development of billing solutions.

What will you work on?

• maintaining and configuring the Comarch BSS platform, particularly Product Catalog, Billing and Billing Mediation,
• monitoring platform performance, system jobs, error logs and runtime incidents,
• investigating data issues and identifying their root causes,
• monitoring system interfaces and integrations to ensure uninterrupted end-to-end data flows,
• supporting backup and recovery processes and solutions that strengthen system availability,
• configuring data connections and integrations and taking technical ownership after implementation,
• supporting audit controls, security requirements and compliance-related activities,
• following the BSS roadmap, running Proofs of Concept and maintaining technical documentation,
• contributing to platform upgrades, patches, new functionalities and technical issue resolution.

Qualifications

This cooperation may be a strong match if you:

• have at least three years of experience with Comarch BSS, particularly Product Catalog, Billing or Billing Mediation,
• use SQL for data analysis, record tracing and troubleshooting,
• have at least two years of experience with enterprise system integrations and integration tools,
• understand billing processes, including invoicing, rating and usage-based billing,
• are familiar with Oracle or PostgreSQL databases and Elasticsearch,
• have practical experience with Linux, REST API testing and Apache Kafka,
• communicate in English at B2 level or higher.

Additional advantages:

• experience with enterprise systems such as CRM, ERP, data warehouses or event-streaming solutions,
• knowledge of Apache Cassandra,
• knowledge of Kubernetes,
• English proficiency at C1 level.

Technology and AI in everyday work

We are looking for someone who actively uses AI tools such as ChatGPT, Claude or GitHub Copilot. These tools may support log analysis, SQL query generation and optimisation, technical documentation and the initial diagnosis of system issues.

Additional Information

What we offer

• A real impact on the stability, development, and future direction of our billing solutions.
• The opportunity to work with complex, business-critical systems and solve challenges that matter to day-to-day operations.
• Space to bring your expertise, propose improvements, and take technical ownership of the solutions you work on.
• 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.
• Full time contract of employment

Thank you for your interest in this opportunity. We will contact only those candidates whose qualifications and experience best match the requirements of the position. All applications will be treated with the strictest confidentiality