Sagar
Senior Data Scientist
Florianópolis, Brazil · America/Sao_Paulo (UTC-3) · 9 years of experience
Sagar focuses on turning messy data into tested models and useful decisions.
Request a shortlistWhy this profile fits
Decision-first problem framing
Starts with the decision, target metric, and data limits before choosing a model or analytical method.
Validated modeling
Uses holdouts, experiment design, and error analysis to separate a useful signal from a convincing notebook.
Clear operational handoff
Documents assumptions, monitoring needs, and the path from analysis to a decision or production workflow.
Relevant toolkit
PythonSQL
scikit-learn
PyTorch
dbtDelivery evidence
Selected work
Self-Serve Experimentation Platform
Consumer marketplaceDesigned and built a self-serve A/B testing platform with CUPED variance reduction and sequential testing guardrails so product teams could launch trustworthy experiments without a statistician in the loop. Adoption grew to 60+ teams running 400+ experiments a year, and invalid rollouts dropped sharply after automated sanity checks and sample-ratio-mismatch alerts.
Churn Uplift and Retention Engine
Subscription SaaSBuilt heterogeneous treatment effect models (X-learner, causal forests) to target retention offers only at persuadable users, validated with holdout switchback tests. Cut incentive spend by 41% while lifting 90-day retained revenue 18%, and delivered the scoring pipeline plus a live monitoring dashboard.
Relevant experience
Career timeline
Senior Data Scientist, Experimentation & Causal Inference
Feb 2022–PresentGlobal consumer marketplace (engagement via Devlyn) · Remote, Florianópolis, Brazil
- Own the company-wide experimentation platform used by 60+ product and growth teams, embedding CUPED variance reduction and sequential testing that cut required sample sizes by roughly 30%.
Senior Software Engineer
May 2023–PresentViitorCloud Technologies · Ahmedabad, Gujarat, India · On-site
- As a Senior Software Engineer and Tech Lead, I play a key role in architecting, designing, and optimizing scalable backend systems. With expertise in Node.js (NestJS & Express.js), I drive the development of robust microservices while ensuring high performance, security, and maintainability.
Junior Engineer
Aug 2020–Apr 2023ViitorCloud Technologies · Ahmedabad, Gujarat, India · On-site
- Built ETA and demand-forecasting models with scikit-learn and time-series methods, improving dispatch efficiency and cutting driver idle time by 14%.
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Skill depth
Show experience in context.
Relevant experience by skill
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Languages
Frameworks
Libraries/APIs
Tools
Paradigms
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Storage
Other
Education
Formal background
MSc, Applied Statistics
Universidade de São Paulo (USP) · 2017–2019 · Thesis on heterogeneous treatment effects
BSc, Statistics
Universidade Federal de Santa Catarina (UFSC) · 2013–2016 · Graduated with honors
Credentials
Certifications
AWS Certified Machine Learning Engineer – Associate
Amazon Web Services · 2022 · Certified
dbt Analytics Engineering Certification
dbt Labs · 2025 · Certified
Communication
Languages
Portuguese
Native
English
Fluent
Spanish
Conversational
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