Senior Reltio MDM Developer

Billennium; Warszawa; On-site; PLN 240,000 - 360,000; Full time

Benefits offered by this job

Udemy for Business

Private medical care

Multisport card

Language lessons

Shopping vouchers

Remote/hybrid work options

Career growth

Job summary

Billennium is seeking a Senior Reltio MDM Developer to join a strategic Enterprise Master Data Management program for a global client. You will contribute to design, governance, and enhancement of Reltio-based MDM solutions across multiple business domains.

You will design data models, match & merge logic, survivorship rules, and build integrations using Reltio APIs and RIH, while collaborating with architects, data engineers, and stakeholders in an Agile environment.

Qualifications

• 5+ years in Master Data Management, including 4+ years with Reltio MDM.
• Expertise in Reltio configuration: data models, match & merge, survivorship, crosswalks, hierarchies, reference data management.
• Experience with REST APIs, RIH, JSON, REST services, and enterprise data integrations.
• Understanding data governance, data quality, and master data lifecycle.
• Experience supporting production environments, strong troubleshooting and Agile delivery.

Responsibilities

• Design, configure, and enhance Reltio MDM solutions, including data models, entities, relationships, hierarchies, crosswalks, and golden records.
• Develop and maintain match & merge logic, survivorship rules, data quality controls, and stewardship processes.
• Build and support integrations using Reltio APIs and RIH, ensuring seamless data exchange across enterprise platforms.
• Provide production support, troubleshoot complex issues, perform root cause analysis, and drive platform stability and continuous improvement.
• Collaborate closely with architects, data engineers, business stakeholders, and governance teams in a global Agile environment.

Skills

Master Data Management

Reltio MDM

Data governance

Data quality

Agile delivery

Stakeholder management

Tools

Reltio REST APIs

Reltio Integration Hub (RIH)

Job description

More about us

Billennium is a global technology company with over 20 years of experience, committed to innovation and empowering businesses. As an employer, we offer a supportive, growth-focused environment where collaboration and creativity thrive. Join us to shape the future of technology together!

About the Role

We are looking for an experienced Senior Reltio MDM Developer who will join a project for our global client. In this role, you will contribute to a strategic Enterprise Master Data Management program, supporting the design, development, governance, and enhancement of Reltio-based MDM solutions across multiple business domains.

What you will do

• Design, configure, and enhance Reltio MDM solutions, including data models, entities, relationships, hierarchies, crosswalks, and golden records.
• Develop and maintain match & merge logic, survivorship rules, data quality controls, and stewardship processes.
• Build and support integrations using Reltio APIs and Reltio Integration Hub (RIH), ensuring seamless data exchange across enterprise platforms.
• Provide production support, troubleshoot complex issues, perform root cause analysis, and drive platform stability and continuous improvement.
• Collaborate closely with architects, data engineers, business stakeholders, and governance teams in a global Agile environment.

What we are looking for

• 5+ years of experience in Master Data Management, including 4+ years of hands‑on experience with Reltio MDM.
• Strong expertise in Reltio configuration, including data models, match & merge, survivorship, crosswalks, relationship management, hierarchies, and reference data management.
• Experience with Reltio REST APIs, Reltio Integration Hub (RIH), JSON, REST services, and enterprise data integrations.
• Solid understanding of data governance, data quality, master data lifecycle, data migration, and large-scale enterprise datasets.
• Experience supporting production environments, combined with strong troubleshooting, stakeholder management, and Agile delivery skills.

Perks and benefits (our offer)

• Comprehensive benefits - enjoy Udemy for Business, private medical care, Multisport card, veterinary package, language lessons, and shopping vouchers.
• Flexibility - adaptable working hours and remote/hybrid work options to suit your lifestyle & location.
• Career growth - access opportunities for professional development and learning, including perks related to our official partnerships with global IT giants: Microsoft, AWS, Snowflake, Salesforce & more.
• Global collaboration - work with a diverse, international team.
• Innovative environment - be part of a forward-thinking and growth-oriented workplace.
• Engaging community – Work with passionate professionals and participate in team-building events, hackathons, and CSR initiatives to make an impact beyond work.
• Team-building events including our company tradition (annual company event in Mazury).
• A pleasant surprise to start your journey with us in the form of a welcome pack.

Recruitment process

• HR call
• Technical Interview
• Interview with the dedicated Client
• Final decision / Feedback