Radix Trading Interview Process & Prep
Radix is a secretive Chicago HFT firm with a Quant Technologist model. Expect hard C++/algorithms, numerical-analysis problems (stable summation, catastrophic cancellation, custom allocators), plus probability and linear algebra. No game.
The Radix Trading interview funnel
1. Recruiter / Screen
Phone - background + fitAn intro conversation about background and interest, sometimes with a quick technical warm-up.
2. C++ & Algorithms
60-90 min - codingC++ implementation and numerical problems: reference-counted shared_ptr, fixed-buffer allocator, stable summation (Kahan), tournament min-comparisons.
3. Probability & Numerical
45-60 min - videoProbability, combinatorics, and statistics with a numerical bent (variance computation, sampling).
4. Linear Algebra & Optimization
45-60 min - researchLinear algebra (eigenvalues, conditioning), optimization (LP/least-absolute-deviations), regression, and stochastic processes.
5. Onsite - Hardest Rounds
Final rounds - the toughest reported problemsThe hardest reported Radix Trading problems across every topic. (Hard-rated only; earlier rounds cover easy/medium, so nothing repeats.)
Radix Trading interview — FAQ
What is the Radix Trading interview process?
Radix is a secretive Chicago HFT firm with a Quant Technologist model. Expect hard C++/algorithms, numerical-analysis problems (stable summation, catastrophic cancellation, custom allocators), plus probability and linear algebra. No game. The loop runs 5 stages: Recruiter / Screen, C++ & Algorithms, Probability & Numerical, Linear Algebra & Optimization, Onsite - Hardest Rounds.
How many rounds does Radix Trading have?
5 stages in total, starting with the Recruiter / Screen and ending with the Onsite - Hardest Rounds.
How do I prepare for the Radix Trading interview?
Work the stage notes above, then drill the Radix Trading interview-questions set and the Radix Trading online-assessment practice — each problem has a full worked solution.