Data Analyst - OnePortal @ T-Mobile Polska

Be a part of T-Mobile’s digital transformation journey! We’re looking for a Data Analyst to join the One Portal team — a pan-European eCommerce solution for B2B customers. If you're passionate about turning raw data into powerful insights that drive decisions, this is your opportunity.

We require on-site presence once a month.

• Proficient in SQL, with experience querying large datasets and optimizing performance
• Skilled in data visualization tools (e.g., Tableau, Power BI, Metabase)
• Experience in Python or R for analysis and automation is a plus
• Strong understanding of product funnels, user journeys, and cohort analysis
• Familiarity with A / B testing methods and statistical evaluation
• Solid business acumen — you know how to turn numbers into actionable decisions
• Clear and confident communicator — able to present findings to both technical and non-technical audiences
• Detail-oriented with a commitment to data quality and governance
• Comfortable juggling multiple tasks in a fast-paced, agile environment

Be a part of T-Mobile’s digital transformation journey! We’re looking for a Data Analyst to join the One Portal team — a pan-European eCommerce solution for B2B customers. If you're passionate about turning raw data into powerful insights that drive decisions, this is your opportunity.

We require on-site presence once a month.

Lead deep-dive analyses to uncover business trends, user behavior, and operational inefficiencies, Translate data into clear narratives and visual stories for product, business, and technical stakeholders, Define and maintain KPIs for specific product domains or journey, Build and maintain dashboards and automated reports to monitor performance and identify trends, Serve as the go-to analytics contact for business, product, and operations teams, Turn open-ended business questions into testable hypotheses and structured problem-solving approaches, Support A / B testing from design to interpretation, Ensure accuracy, consistency, and trustworthiness across all reporting layers, Audit data logic and pipelines, and flag anomalies and inconsistencies, Partner with engineering teams to maintain data integrity, Deliver timely and actionable insights to support strategic initiatives, product launches, campaign performance, and continuous optimization, Prioritize findings by business impact and urgency, Work closely with Data Engineers, PMs, and other Analysts to maintain consistency across metrics and improve decision-making, Influence product and analytics roadmaps through recurring insight-driven recommendations] Requirements : SQL, Tableau, Power BI, Metabase, A / B Testing, Python, R, Automation