Knowing and performing are connected skills.
Interview preparation usually builds private knowledge. Gradient adds retrieval, spoken practice, timing and feedback, so that what you know becomes available in the moment it is needed.
Why Gradient existsTechnical knowledge deserves
Technical knowledge deserves
a voice that can carry it.
Gradient was built for experienced data science candidates who want to deepen their judgment, practice the questions interviews actually ask, and communicate their reasoning clearly under pressure.
Get notifiedOur philosophyFour things this is
Four things this is
built on.
Nine modules organized around judgment.
Probability, Experimentation, Causal Inference and Product Sense build the decisions senior data scientists are actually asked to make. Code Lab adds SQL, Python and algorithmic thinking. Interview Skills covers the delivery.
Transparent scoring, grounded in evidence.
Every spoken response is evaluated across knowledge quality, communication and interview rhythm. The verdict quotes your own words, chooses one primary correction, and makes the next attempt concrete.
Performance changes from attempt to attempt.
Every score belongs to one response, on one day, under one set of conditions. Practice creates new evidence. Mastery grows through repeated strong performances, not through a single good one.
Built bySelin
Selin
Erguncu
Selin is a senior data scientist with a PhD whose career spans Apple, Microsoft and academia, working in experimentation, causal inference and product analytics.
Gradient brings together the technical preparation she values and the interview lessons she learned across years of preparing, interviewing, and helping other candidates get ready.
Her Interview Skills framework covers communication, reasoning under pressure, presence on camera and interview day readiness — with particular attention to the moments when stress narrows working memory and makes familiar knowledge harder to reach.
Selin Erguncu, PhDSenior Data Scientist · Apple · previously Microsoft
Four minutes on why
the rubric is public.
What Gradient measures, what it deliberately does not, and why every weight is printed on the page rather than hidden behind a score.
A noteEverything that teaches here is free,
Everything that teaches here is free,
and will stay free.
What costs money is being measured,
because that is the part that costs me money each time it runs.
Still — if the price is the only thing standing between you and getting value out of this, please write to me.I would much rather give it away than have someone decide, quietly, that they cannot afford to get ready.