Senior Java Backend Developer - Tieto Tech Consulting (m/f/d)

Tieto Corp.; Warszawa; Hybrid; PLN 180,000 - 300,000; Full time

Job summary

Tieto Tech Consulting in Warsaw, Poland, seeks a Senior Java Backend Developer to support the COM5.Mobile platform used by telecom operators. The role focuses on backend services, TM Forum APIs, and data models, collaborating with product development and value teams.

You will design and implement microservices with Java 21 and Quarkus, integrate PostgreSQL and Oracle, and ensure code quality through CI pipelines and SonarQube, while communicating in English with cross-functional stakeholders.

Qualifications

• 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.
• Fluent English (written and spoken).

Responsibilities

• Design and implement backend services for telecom network management solutions.
• Develop and extend 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

REST APIs

English fluency

Problem solving

Tools

Quarkus

Spring Boot

Kubernetes

Jenkins

Git

SonarQube

Jira

Confluence

PostgreSQL

Oracle

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.

Technology Stack

• Backend: Java 21, Quarkus, REST APIs, JUnit
• Databases: PostgreSQL, Oracle
• Platform and tools: Kubernetes, Jenkins, Git, SonarQube, Jira, Confluence
• Architecture: Microservices and legacy monolith components; strong backend focus
• Frontend: React / TypeScript (minor exposure)

Responsibilities

• Design and implement backend services for telecom network management solutions
• Develop and extend 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

Qualifications

• 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)

Would be an advantage

• 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

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.

Additional Information

At Tieto, we believe in the power of diversity, equity, and inclusion. We encourage applicants of all backgrounds, genders (m/f/d), and walks of life to join our team, as we believe that this fosters an inspiring workplace and fuels innovation. Our commitment to openness, trust, and diversity is at the heart of our mission to create digital futures that benefit businesses, societies, and humanity.

Stay alert to recruitment scams:

• Tieto only communicates via @tieto.com email addresses.
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• If you receive a suspicious message claiming to be from Tieto, don't respond — verify it via our official careers site.
• For more information visit Important Advisory Regarding Recruitment Fraud | Tieto Blog