Senior Data Analyst

Senior Data Analyst - SQL Specialist in OnePortal (e-commerce)Miejsce pracy: WarszawaTechnologies we useExpectedSQLTableauMetabaseMicrosoft Power BIOptionalPythonRAbout the projectBe 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.Your responsibilitiesLead deep-dive analyses to uncover business trends, user behavior, and operational inefficienciesTranslate data into clear narratives and visual stories for product, business, and technical stakeholdersDefine and maintain KPIs for specific product domains or journeyBuild and maintain dashboards and automated reports to monitor performance and identify trendsServe as the go-to analytics contact for business, product, and operations teamsTurn open-ended business questions into testable hypotheses and structured problem-solving approachesSupport A/B testing from design to interpretationEnsure accuracy, consistency, and trustworthiness across all reporting layersAudit data logic and pipelines, and flag anomalies and inconsistenciesPartner with engineering teams to maintain data integrityDeliver timely and actionable insights to support strategic initiatives, product launches, campaign performance, and continuous optimizationPrioritize findings by business impact and urgencyWork closely with Data Engineers, PMs, and other Analysts to maintain consistency across metrics and improve decision-makingInfluence product and analytics roadmaps through recurring insight-driven recommendationsOur requirementsProficient in SQL, with experience querying large datasets and optimizing performanceSkilled in data visualization tools (e.g., Tableau, Power BI, Metabase)Experience in Python or R for analysis and automation is a plusStrong understanding of product funnels, user journeys, and cohort analysisFamiliarity with A/B testing methods and statistical evaluationSolid business acumen — you know how to turn numbers into actionable decisionsClear and confident communicator — able to present findings to both technical and non-technical audiencesDetail-oriented with a commitment to data quality and governanceComfortable juggling multiple tasks in a fast-paced, agile environmentBenefitssharing the costs of sports activitiesprivate medical caresharing the costs of professional training & courseslife insuranceremote work opportunitiesflexible working timecorporate products and services at discounted pricesmobile phone available for private useno dress codeparking space for employeesemployee referral programcharity initiativesRecruitment stagesWyślij swoje CV ;)Spotkaj się z liderem/liderkąSpotkaj się z naszym EkspertemWitamy w T-Mobile :)Join One Portal and Lead Data-Driven Decisions at ScaleOne Portal is a pan-European B2B eCommerce and self-care platform transforming how business customers interact with Deutsche Telekom across multiple markets. Behind the platform stands data — complex, cross-country, and rich with opportunities to drive real business impact.We are looking for senior data professionals who want more than dashboards. In this role, you will shape how data is used across the product and markets: from defining metrics and analytical frameworks, through advanced analysis and experimentation, to influencing strategic product and business decisions.As a Senior Data Analyst you will work at the intersection of product, technology, and business. You will collaborate with product owners, engineers, UX, and local market teams, helping them move from intuition to evidence-based decisions. Your insights will directly influence roadmap priorities, adoption strategy, customer experience, and platform scalability across Europe.This is a role for someone who enjoys ownership and leadership — setting standards, mentoring others, and building a strong data culture in an international, agile environment. You will deal with large-scale, multi-market data, complex user journeys, and real-life business problems, not theoretical exercises.If you are passionate about turning data into action, influencing decisions at scale, and building data maturity in a growing international product — One Portal is the place where your impact will be visible and meaningful.Apply and help us build a truly data-driven B2B platform across Europe.T-MobileWe are a technology company, and our goal is to create innovative solutions for individual and business clients.At T-Mobile, we all live in a magenta world This color is close to our hearts and means faith in the success of undertaken actions, self-confidence, and endurance.That’s who we are as a team.At #MagentaTeam , we focus on exchanging experiences, agile work, and quick adaptation to changes #MagentaTeam is, above all, a mix of different competencies, experiences, personalities, temperaments, and views. And this diversity is our greatest strength.Wszystkie informacje o przetwarzaniu danych osobowych w tej rekrutacji znajdziesz w formularzu aplikacyjnym, po kliknięciu w przycisk "Aplikuj Teraz".