Data Engineer - Data Contracts

T-Mobile Polska is undertaking a strategic data transformation project, migrating analytics from on-premise to Google Cloud Platform (GCP). The project involves building data architecture and models from scratch with a focus on increasing business value and improving customer experience (CX). Technologies used include GCP, Spark, Python, Kubernetes, BigQuery, Vertex AI, Terraform, and Looker. The initiative integrates diverse, high-volume data sources, designs streaming and batch processing layers, implements data governance, lineage, quality, security, CI/CD, and monitoring/SLO, supporting AI/LLM solutions. This is part of a broader data transformation program redefining T-Mobile's daily data operations, fostering experimentation, rapid prototyping, and innovation based on openness and collaboration.

• Minimum 3-4 years of experience as Data Engineer or Data Architect
• Experience designing data models and data architecture
• Experience building microservice architecture and data exchange interfaces
• Experience in data projects within large corporations
• Knowledge of Data Contracts and tools supporting their automation
• Experience in data analysis, processing, and modeling; knowledge of Data Warehouse architecture (Oracle) and Big Data (Hive, Spark)
• Advanced SQL and PL/SQL query skills with practical experience
• Practice in data quality assurance including testing, monitoring, and alerting
• Experience creating technical documentation and performing code reviews
• Ability to work in teams and communicate with business, technical, and analytical teams
• Proactivity, responsibility, and quality focus in data area

Nice to have:

• Experience with data management tools such as dbt, Dataform, Dataplex, Data Catalog
• Knowledge of Google Cloud Platform (GCP) ecosystem

• Define architecture and standards for Data Contracts within the company
• Design and implement Data Contracts including formats, schemas, validation, and versioning processes
• Select tools supporting Data Contracts automation
• Establish processes for creation, maintenance, and evaluation of Data Contracts
• Collaborate with product teams, data engineering, BI, and data owners
• Support development teams in defining Data Contracts