Senior Java Backend Developer (Telecom)

Location: Warsaw, Poland

Company

hirify.global is a large Nordic technology company providing digital products and consulting services.

What you will do

• Design and implement backend services for COM5.Mobile, a telecom network management and optimization platform.
• Develop and extend TM Forum-compliant APIs, including TMF-633 and TMF-639.
• Implement resource inventory and service catalog exposure for external systems.
• Work with complex OSS network data models covering slicing, network resources, and configuration data.
• Develop Java 21 and Quarkus microservices integrated with PostgreSQL and Oracle.
• Support audit and optimization use cases, code quality, CI pipelines, and collaboration with product owners, architects, and project leads.

Requirements

• 5+ years of professional experience in Java backend development.
• Strong experience with REST APIs and service-oriented architectures.
• Solid knowledge of SQL and relational databases.
• Experience with modern Java frameworks such as Quarkus, Spring Boot, or similar.
• Familiarity with CI/CD pipelines and code quality tools.
• Comfort working in existing product codebases, not only greenfield projects.
• Fluent English, written and spoken, is required.

Nice to have

• Telecommunications or network management background.
• Experience with TM Forum APIs, including TMF-633 and TMF-639 or similar.
• Understanding of OSS/BSS systems.
• Knowledge of 3GPP and 5G concepts such as slicing, NRM, and gNBs.
• Experience with network or radio-related data models.
• Kubernetes or cloud-native experience beyond basic usage.

Culture & Benefits

• Work in a cross-functional environment with product, architecture, and customer value teams.
• Inclusive workplace focused on diversity, equity, openness, trust, and innovation.
• Salary information and remuneration criteria are shared before the interview process and confirmed before an offer.

Hiring process

• Compensation details will be provided before interviews and confirmed before the offer.
• Tieto communicates with candidates only through @tieto.com email addresses and does not request recruitment fees or financial details.