Java backend developer in telecom

Tieto; Warszawa; On-site; PLN 180,000 - 260,000; Full time

Job summary

Tieto is hiring a Senior Java Backend Developer to join Tieto Tech Consulting, supporting COM5.Mobile with backend services and TMF API work for telecom operators.

You will build microservices using Java 21 and Quarkus, integrate with PostgreSQL and Oracle, and collaborate with product owners, architects, and cross-functional teams. English communication is required.

Qualifications

• 5+ years of professional Java backend development.
• Strong REST APIs and service-oriented architectures.
• Solid SQL knowledge and relational databases.
• Experience with modern Java frameworks such as Quarkus or Spring Boot.
• Familiarity with CI/CD pipelines and code quality tools.]
• Fluent written and spoken English.

Responsibilities

• Design and implement backend services for telecom network management solutions.
• Develop and extend TMF-compliant APIs (TMF-633, TMF-639).
• Implement resource inventory and service catalog exposure for external systems.
• Work with complex network and OSS data models (slicing, network resources, configuration data).
• Develop microservices using Java 21 and Quarkus.
• Integrate services with PostgreSQL and Oracle databases.
• Support audit and optimization use cases (e.g. slicing audits, discrepancy detection).
• Ensure code quality through unit tests, CI pipelines, and SonarQube.
• Collaborate within cross-functional teams using Jira and Confluence.
• Communicate in English with product owners, architects, and project leads.

Skills

Java backend development

REST APIs

English (fluent)

Tools

Quarkus

Spring Boot

CI/CD

SonarQube

Job description

Do you have a strong Java Backend Developer background, passion for problem-solving, and want to join one of the largest tech companies in the Nordics? Then this is the role for you! We are looking for a Senior Java Backend Developer to join Tieto Tech Consulting to support the development and extension of COM5.Mobile, a mature network management and optimization platform used by major telecom operators. The role focuses on backend services, TM Forum APIs, and network-related data models, working with Micronova's Product Development and Customer Value Teams.

Задачи:

• Design and implement backend services for telecom network management solutions
• Develop and extend TMF-compliant APIs (e.g. TMF‑633, TMF‑639)
• Implement resource inventory and service catalog exposure for external systems
• Work with complex network and OSS data models (slicing, network resources, configuration data)
• Develop microservices using Java 21 and Quarkus
• Integrate services with PostgreSQL and Oracle databases
• Support audit and optimization use cases (e.g. slicing audits, discrepancy detection)
• Ensure code quality through unit tests, CI pipelines, and SonarQube
• Collaborate within cross-functional teams using Jira and Confluence
• Communicate in English with product owners, architects, and project leads

Требования:

• 5+ years 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 (Quarkus, Spring Boot, similar)
• Familiarity with CI/CD pipelines and code quality tools
• Comfortable working in existing product codebases, not greenfield only
• Fluent English (written and spoken)

Будет плюсом:

• Background in telecommunications or network management
• Experience with TM Forum APIs (TMF‑633, TMF‑639 or similar)
• Understanding of OSS / BSS systems
• Knowledge of 3GPP / 5G network concepts (slicing, NRM, gNBs, etc.)
• Experience working with network or radio-related data models
• Kubernetes / cloud-native experience beyond basic usage

Условия:

Information about the salary range and the criteria used to determine remuneration will be shared with candidates prior to the interview process and confirmed before an offer is made.