Flow Traders Online Assessment
Flow Traders is a low-latency ETF market maker, and its OA reflects that profile: it tests language fluency far more than algorithms. The screen is roughly 7 multiple-choice questions on uncommon C++ and Python quirks (output prediction, undefined behavior, evaluation order) plus 3 coding problems - 2 easy and 1 harder (a reported 'Job Scheduling' balanced-processors question). Know your language corner cases cold.
Trader / Junior Dev — Language MCQ + coding
A short, fast screen: about 7 multiple-choice 'what does this print' questions on less-common C++ / Python syntax (operator precedence, integer division, pre/post-increment, list aliasing, default mutable arguments, short-circuit evaluation, char arithmetic), then 3 coding problems (2 straightforward, 1 harder). The timed MCQ section below reproduces the language-quirk half on the clock.
Trader / Junior Dev — Coding (2 easy + 1 harder)
After the language-quirk MCQs, the OA has 3 coding problems (2 easy, 1 harder). Auto-graded below.
- Second Largest Distinct Value Coding · easy
- Balanced Brackets Coding · easy
- Balanced Job Scheduling: Max Jobs on the Fast Processor Coding · medium
Flow Traders OA — FAQ
What is the Flow Traders online assessment?
Flow Traders is a low-latency ETF market maker, and its OA reflects that profile: it tests language fluency far more than algorithms. The screen is roughly 7 multiple-choice questions on uncommon C++ and Python quirks (output prediction, undefined behavior, evaluation order) plus 3 coding problems - 2 easy and 1 harder (a reported 'Job Scheduling' balanced-processors question). Know your language corner cases cold.
What is the format of the Flow Traders OA?
It runs as 2 tracks (Language MCQ + coding, Coding (2 easy + 1 harder)). Trader / Junior Dev, Trader / Junior Dev — each timed, auto-graded where applicable.
How do I practice for the Flow Traders online assessment?
Work the sample questions above (each with a full worked solution), then take the interactive Flow Traders OA practice on QuantVault. For the full interview, see the Flow Traders interview-questions set.