About the company

OTE Group is the largest technology company in Greece and a member of the Deutsche Telekom Group. Through technology and innovation, we work to create a better world for all.

Diversity, inclusion and equality are at the core of our corporate culture.

This is the reason why we create an equal working environment in which our people can excel for their expertise, professional experience, conscientiousness, and responsibility.

Become part of our network and let’s create your future together!

About the role

Artificial intelligence and data are shaping the future – and you can be at the heart of this change! The new Data & AI Transformation Directorate / AI Transformation Tribe of the OTE Group is looking for people with vision, enthusiasm, and commitment to contribute to the Organization’s digital transformation.

If you want to actively contribute to the digital transformation of one of the largest organizations in Greece and leave your mark on projects and solutions that leverage the power of data and artificial intelligence to drive innovation, then this role is for you.

We are looking for Data Engineers who want to work in cross-functional product squads, build data pipelines (ETL/ELT), ensure data quality and observability by design, and collaborate closely with Data Scientists, ML Engineers, and Product Owners to deliver functional and reliable data products and AI solutions with measurable business impact.

Key Responsibilities

• Design and implement end-to-end data pipeline and data product architectures (batch + streaming) for analytics/AI.
• Participate in and/or technically lead data modeling activities for lakehouse/warehouse environments, ensuring performance, scalability, and cost efficiency.
• Contribute to defining standards and best practices in data quality, testing, monitoring/observability, and data SLAs.
• Collaborate closely with ML/AI teams on feature pipelines, dataset versioning, and building dependable data foundations for ML workflows.
• Conduct code reviews and elevate the team’s overall engineering maturity.
• Contribute to cross-squad alignment (shared datasets, governance).
• Participate in incident handling and root-cause analysis for data issues, building prevention mechanisms.

Required Skills

• Strong knowledge of advanced SQL (optimization, partitioning strategies, query tuning).
• Strong knowledge of Python (and/or Scala/Java) for robust data processing.
• Solid experience with ETL pipelines (e.g., DBT, Spark) and orchestration tools (e.g., Airflow/Dagster).
• Hands-on experience with cloud data platforms (e.g., Azure or GCP Data Factory, Snowflake, Databricks, etc.).
• Experience with streaming technologies (e.g., Kafka, Spark Structured Streaming, event-driven architectures).
• Experience with data quality frameworks (e.g., Great Expectations or custom solutions) and observability practices.
• Ability to translate business needs into technical designs, managing trade-offs (latency vs cost vs complexity).
• Strong soft skills: stakeholder management, clarity in requirements, and technical leadership without a “command-and-control” approach.

Preferred Skills

• Experience with Lakehouse patterns (Delta/Iceberg/Hudi) and governance.
• Experience in DataOps / CI/CD for data (testing, deployment, environment promotion) using Jenkins and GitLab.
• Knowledge of privacy and security principles (GDPR), data masking, access control, RBAC/ABAC.
• Understanding of telecom data (CDRs, network events) or high-volume event analytics.

What we offer

At OTE Group, we recognize and reward every effort without discrimination, through a wide range of benefits and programs for our people:

Your benefits

·        Competitive remuneration package

·        Cafeteria benefits

·        Company Mobile & Device Subsidies

·        Fixed telephony, Internet & COSMOTE TV Packages

·        Modern working environment, working laptop only

Your balance

·        Flexible working arrangements

·        Private insurance for employees and their family members

·        Family Care: Maternity, childbirth and parental leave to care for children, above the minimum required by law. Provided equally to working mothers & fathers

Your wellness

·        Health, safety & wellness programs: Exercise & Wellness Platform “The Coach”

·        Wellness and sports activities, dietician appointments, medical check-ups, etc.

·        OTE Group psychological service

Your development

We foster an empowering culture, encouraging our people to seize every opportunity to learn with the goal to achieve personal development, through:

·        Unlimited access to digital learning platforms Percipio & Coursera

·        Various f2f custom made learning academies

·        Talent & rotation programs

Your On-boarding

·        Virtual new hire pre-boarding & onboarding program

·        A buddy to support you in the first months working with us