Quadeye Interview Questions: OA Format & Interview Rounds

Quadeye is a Gurgaon-based high-frequency trading firm that trades its own capital across global equities, futures, and options markets. On Indian campuses it is best known for two things: it is repeatedly described by interns and placement blogs as offering among the highest pay of any India-based quant firm, and its hiring is concentrated at the IITs, where it recruits quantitative strategists, quant traders, and low-latency systems engineers through placement season. That campus focus shapes the whole process — it is a compressed, puzzle-dense gauntlet rather than the drawn-out multi-week loops you see at US pod shops.

The online assessment, as candidates describe it

The most commonly described Quadeye OA format, drawn from placement write-ups on Medium and IIT student blogs, is a three-section timed test: probability, computer systems, and coding, with roughly 30–40 minutes per section. A detail candidates repeatedly flag: each section has its own dedicated time slot and you cannot switch between sections once you start one, so there is no banking time from an easy section to spend on a hard one.

• Probability: counting and combinatorics-flavored problems — permutations, arrangements, expected values — plus strategy-building puzzles.
• Systems: CS fundamentals in the operating systems / architecture family, weighted more heavily for engineering tracks.
• Coding: DSA problems on basic concepts (binary search, string manipulation appear in reports); candidates report being able to choose Python or C++ for at least some problems.

One honest caveat: the format is not uniform. At least one 2024 IIT Kharagpur internship write-up reports that Quadeye skipped the online test entirely for that track, shortlisting directly from CVs (with a reported CGPA cutoff around 9.0) and going straight to interviews. Treat the three-section OA as the common case, not a guarantee — and if you want the general playbook for these tests, our guide to how quant online assessments work covers the mechanics that carry across firms.

The interview rounds

Reported round counts vary widely — some quant candidates describe 3–4 short rounds ending in HR, while one systems/quant-strategist candidate documented eight rounds (six in-person plus two telephonic), each 30–40 minutes. As of mid-2026, Glassdoor holds roughly 45 Quadeye interview reports with an average difficulty just under 3 out of 5 and a modestly positive experience rating. The recurring building blocks across reports:

A practical detail from a placement write-up worth taking literally: practice writing code on paper, because at least some Quadeye rounds require it, and "it's very easy to mess up at first go."

What the puzzle rounds actually reward

For quant profiles specifically, candidates are blunt that ML and heavy modeling barely feature. What Quadeye interviewers reportedly probe is speed: quick math, fast expected-value estimates, and clean case-splitting on combinatorics problems like counting arrangements or computing $P(\text{win})$ under a proposed strategy. The "strategy games" theme — two-player setups where you must find and defend an optimal policy — shows up in enough reports that our game theory question set is directly relevant. Multiple candidates also note that their interview puzzles overlapped heavily with published sources, naming Brainstellar and Xinfeng Zhou's Green Book explicitly — which makes working through Green Book problems unusually high-yield here compared to firms that write fully original questions.

How to prepare

1. Probability and counting first. This is the spine of every quant-track round. Grind expected value, conditional probability, and permutation/combination problems until case-splitting is automatic.
2. Classic puzzle books. Candidates repeatedly cite the Green Book, Fifty Challenging Problems in Probability, and Heard on the Street. Given the reported overlap with real rounds, this is the rare firm where book prep converts almost one-to-one.
3. Mental math under a clock. One round is reportedly pure quick math — train it as a timed skill, not a byproduct.
4. DSA basics, on paper. Easy/medium LeetCode-level coverage plus handwritten pseudocode reps. Engineering tracks should add C++ internals, OS, and networking.
5. Calibrate difficulty. Quadeye sits in the puzzle-heavy HFT tier; see where it lands against peers in our firms-by-difficulty ranking.

Ready to drill? Work through our probability question bank and brainteaser set for the puzzle rounds, then pressure-test your speed and decision-making in our trading games before placement season.