[Job - 23033] Senior Data Analyst, Brazil

We are tech transformation specialists, uniting human expertise with AI to create scalable tech solutions.With over 7.400 CI&Ters around the world, we’ve built partnerships with more than 1,000 clients during our 30 years of history. Artificial Intelligence is our reality.
As a Data Analyst on the Experimentation team, you will be the analytical backbone of our testing practice. Your role is to define, validate, and execute the methodologies behind A/B tests to ensure results are statistically sound and actionable. You will be responsible for writing clear queries, validating experimental integrity, and interpreting results with rigor. You’ll collaborate with product, engineering, and behavioral science partners — and drive the trustworthy, scalable analysis that powers learning and product innovation.

Responsibilities:Partner with PMs, Behavioral Scientists, and Engineers to define metrics, MDEs, and data tracking requirements.Lead the analytical design of experiments by developing robust queries, power analyses, and randomization checks.Conduct pre-test diagnostics (baseline analysis, seasonality detection, sample size calculation).Own statistical validity: validate experiment setup and analyze outcomes with attention to p-values, effect sizes, and error risks.Partner with Behavioral Scientists to synthesize experiment results into insights — with clarity around uncertainty and tradeoffs.Support meta-analyses and iterative tracking of experiments to spot long-term patterns.Document statistical approaches and contribute to internal standards and best practices.Contribute analytical expertise to the Experimentation Platform development (dashboards, pipelines, automation).Proactively manage time and priorities in alignment with PM and TPM support — maintaining organized backlogs and clear communication.
Requirements for this challenge:Solid experience as a Data AnalystSolid foundation in statistics, experimental design, and hypothesis testing.Strong SQL skills and experience with Python or R for data manipulation and visualizationFamiliarity with A/B testing platforms and event-based data modelsClear, structured communicator who can convey complexity simply - in English and PortuguesePassion for empowering teams to learn fast through trustworthy experimentationPrevious collaboration with PMs and behavioral data scientists Advanced/Fluent English skills
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Our benefits:
-Health and dental insurance-Meal and food allowance-Childcare assistance-Extended paternity leave-Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass;-Profit Sharing and Results Participation (PLR);-Life insurance-Continuous learning platform (CI&T University);-Discount club-Free online platform dedicated to physical, mental, and overall well-being-Pregnancy and responsible parenting course-Partnerships with online learning platforms-Language learning platformAnd many more!
More details about our benefits here: https://ciandt.com/br/pt-br/carreiras
At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.
We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.