Company

Headlands interview questions

4 practice questions in the style of Headlands's interviews, covering Software Engineering Fundamentals, Statistics & Math, Machine Learning.

Questions4

0 easy4 medium0 hard

Your progress0/4

Headlands interview questions by the numbers

Last updated October 28, 2026

Katkat has 4 Headlands interview questions. The largest topics are Statistics & Math (50%), Machine Learning (25%) and Software Engineering Fundamentals (25%). By difficulty: 100% medium. The most common round is Online Assessment (75%). Frequent concepts include Statistics, Bias-Variance Tradeoff, binomial-distribution and cpp.

Topics

Statistics & Math50% · 2
Machine Learning25% · 1
Software Engineering Fundamentals25% · 1

Difficulty

Medium100% · 4

Interview rounds

Online Assessment75% · 3
Technical Screen25% · 1

Roles

Data Scientist100% · 4

Frequent concepts

Statistics50% · 2
Bias-Variance Tradeoff25% · 1
binomial-distribution25% · 1
cpp25% · 1
Cross-Validation25% · 1
Econometrics25% · 1

Most mentioned in interview experiences

Counted from 2 candidate interview experiences on Katkat. How we collect and count

Showing 1–4 of 4 results

C++ Sliding-Window Mean of a Float Array With Inf, -Inf and NaN HandlingMedium
Implement an O(n) sliding-window mean over a 32-bit float array containing IEEE-754 special values (+inf, -inf, NaN) without poisoning subsequent windows or suffering numerical drift.
HeadlandsData ScientistSoftware Engineering FundamentalsOnline Assessment
Compare Candy-Color Guessing Experiments with Different Sample SizesMedium
Evaluate and compare evidence from two binomial experiments with different sample sizes and hit rates against a random guessing null hypothesis.
HeadlandsData ScientistStatistics & MathTechnical Screen
What Cross-Validation Reduces: Bias, Variance, Type I or Type II ErrorMedium
This question tests your conceptual understanding of how k-fold cross-validation affects the generalization error and how the choice of 'k' influences the trade-off between bias and variance in model performance estimation.
HeadlandsData ScientistMachine LearningOnline Assessment
t-Stat With an Added Orthogonal Regressor, Live Sharpe Check, and Absolute-Loss EstimatorMedium
Solve three core quantitative problems covering OLS regression mechanics under orthogonal regressors, statistical significance of backtested Sharpe ratios in live deployment, and loss-function minimization for L1 error.
HeadlandsData ScientistStatistics & MathOnline Assessment

Headlands interview experiences

All 2 →

A Four-Part Online Assessment on Stats, OLS, and C++Headlands · Research Developer · Online Assessment · Aug 2026
I remember that when I applied two years ago, the question was still that C++ engineering problem — manually parsing an input string, handling timestamps, and running Kahn's Algorithm to compute a dependency graph. This time the OA was completely different, split into 4 parts. Since you had to keep your camera on, I couldn't take screenshots or photos, so everything below is from memory. 10 stati…
An Amsterdam Dinner Led to a Fast OA, Then 40 Minutes on My ResumeHeadlands · Quantitative Researcher · New Grad · Technical Screen · Aug 2026
No response
I'm a rising senior at a UK undergrad program. Over the summer, I got invited to a dinner in Amsterdam by Headlands, which is how I first learned about the company. I applied for the Amsterdam QR New Grad role, and the process moved really fast: applied 7/26 -> OA 7/28 -> first round interview 9/8. OA: 18 questions. 10 multiple choice questions covering probability and statistics, hypothesis test…