Portrait of Ender Sari

Hi! I’m curious about analytics, information visualization, and human behavior.

I’m currently doing my MSc in MTE at EPFL, with a Data Science minor and an EPFL Excellence Fellowship.

I have 5 years of experience in analytics, working on search at Yandex, recommendation systems at Afiniti, and inventory and production planning at Brisa.

In my free time, I train for HYROX and enjoy reading about causal inference and human behavior.

Projects

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Experience

EPFL Space Center

Teaching Assistant New Space Economy MOOC

March 2026 – PresentRemote

  • Analyzed ~4,000 learner profiles and reviewed feedback to identify pain points.
  • Reviewed lecture content for relevance in 2026 and prioritized outdated material for updates.
  • Surveyed space-sector experts to help plan the next version of the course.

Yandex Search Turkey

Data Scientist

Sep 2024 – Sep 2025Remote

  • Designed crowdsourced evaluations to calculate offline search quality metrics.
  • Built dashboards to help product managers identify weaknesses in search quality.
  • Improved reviewer workflows and quality checks, reducing evaluation turnaround from ~10 to 3 days.

Afiniti, Research & Development

Data Scientist

Sep 2022 – Sep 2024Hybrid

  • Built product recommendation systems for call-center agents using customer, call, product, and agent data.
  • Measured a 2% sales revenue uplift against a randomized baseline during live calls.
  • Used bootstrapping to quantify uncertainty around revenue uplift and assess statistical significance.
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Unilever

Research Project in Collaboration with Sabancı University

Sep 2018 – Aug 2020Istanbul, Turkey (On-site)

  • Developed a product segmentation framework to guide inventory and forecasting decisions.
  • Recommended automated, human-led, or hybrid forecasting methods for each product.

Philip Morris SA

Summer Intern, Sales and Analytics

2018Istanbul, Turkey (On-site)

  • Built sales forecasting models and real-time dashboards to support sales planning. Project report (PDF)

Sabancı University

Teaching Assistant

Sep 2016 – Sep 2022Istanbul, Turkey (On-site)

  • Led problem-solving sessions, supported Python exercises, prepared materials, and graded assessments for quantitative courses including Operations Research, Decision Analysis, Simulation, and Stochastic Models.
  • Supported Machine Learning and Artificial Intelligence teaching for high school students.

Education

EPFL

MSc in Management, Technology and Entrepreneurship, Data Science minor

Sep 2025 – PresentLausanne, Switzerland

Master Excellence Fellowship (CHF 20,000 per year, merit-based, top ~1% of applicants).

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Sabancı University

BSc in Industrial Engineering, GPA 3.93 / 4.00

Sep 2016 – Jan 2020Istanbul, Turkey

Ranked 1st in class, full scholarship.