Quadeye interview process (2026)

Round-by-round breakdown of the Quadeye software engineering interview across 3 levels and 14 rounds: interview mode, sample questions, and worked solutions.

Quadeye salary & ratings · All interview processes

Systems Engineer — C++ (Campus / Early Career)

Difficulty: Hard · Timeline: ~1-2 weeks (often 1 day) · Recommended prep: 8-12 weeks

  1. Round 0: Online test (probability + systems + coding)

    Assessment · ~90-120 min (3 timed sections) · difficulty 3/5 · elimination round

    Mode of interview: Online assessment

    Sample question: Best time to buy and sell stock with at most two transactions — given daily prices, return the maximum total profit using at most two non-overlapping buy-sell transactions.

  2. Round 1: DSA / problem-solving round

    Onsite · ~30-45 min · difficulty 3/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Design a data structure that supports insert(x) and getMedian() on a running stream of integers, with getMedian in O(1) and insert in O(log n). Then code it.

  3. Round 2: C++ internals deep-dive

    Onsite · ~30-45 min · difficulty 4/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Walk through exactly what happens when you call a virtual function through a base pointer: vptr, vtable, multiple inheritance thunks. Why can virtual dispatch be slow in a hot path, and how would you avoid it (CRTP, final, devirtualization)?

  4. Round 3: Systems round — OS, networks, architecture + projects

    Onsite · ~30-45 min · difficulty 4/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Your process sends 1 MB over TCP and over UDP on the same LAN. Explain the differences end to end: syscalls, kernel buffers, segmentation, retransmission, ordering, and when a trading system would pick each.

  5. Round 4: HR / fit round

    Behavioral · ~20-30 min

    Mode of interview: Live behavioral interview

Senior C++ Low-Latency Developer (Lateral)

Difficulty: Hard · Timeline: ~3-5 weeks · Recommended prep: 8-12 weeks · Cooldown: ~6 months

  1. Round 0: Recruiter screen

    Phone · ~20-30 min · elimination round

    Mode of interview: Remote phone or video interview

  2. Round 1: Telephonic technical screen (C++ + DSA)

    Phone · ~45-60 min · difficulty 3/5 · elimination round

    Mode of interview: Remote phone or video interview

    Sample question: Implement an LRU cache with O(1) get and put, capacity-bounded, in clean C++ — then discuss which STL containers you used and why, and what breaks under concurrent access.

  3. Round 2: Onsite: C++ internals + low-latency techniques

    Onsite · ~60 min · difficulty 5/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Design a single-producer single-consumer ring buffer for market-data messages: memory ordering on head/tail, avoiding false sharing, why you pad to cache lines, and when memory_order_relaxed is safe.

  4. Round 3: Onsite: systems + trading-stack design

    System_design · ~60 min · difficulty 4/5

    Mode of interview: Live system design interview

    Sample question: Design the software stack of an exchange co-located market-data feed handler + order gateway. Where does latency accumulate, what do you measure, and what would you move off the hot path?

  5. Round 4: Hiring manager + HR wrap-up

    Behavioral · ~30-45 min · difficulty 2/5

    Mode of interview: Live behavioral interview

Quantitative Researcher / Strategist

Difficulty: Hard · Timeline: ~1-3 weeks · Recommended prep: 6-10 weeks

  1. Round 0: Online test (probability + mental math + coding)

    Assessment · ~90-120 min · difficulty 3/5 · elimination round

    Mode of interview: Online assessment

    Sample question: You roll a fair die repeatedly. What is the expected number of rolls to see two sixes in a row? Set up the states and solve the linear equations quickly.

  2. Round 1: Puzzles + probability round

    Onsite · ~30-40 min · difficulty 4/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: You have 2 eggs and a 100-floor building. Find the highest safe floor with the minimum worst-case number of drops. Then generalise: why is the answer 14, and what changes with k eggs?

  3. Round 2: Coding + data structures round

    Onsite · ~30-40 min · difficulty 3/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Given an array of integers and a target k, count the number of contiguous subarrays whose elements sum to exactly k. Aim for O(n).

  4. Round 3: HR + probability wrap-up

    Behavioral · ~20-30 min · difficulty 2/5

    Mode of interview: Live behavioral interview

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Worked sample solutions (code, design diagrams, and STAR answers) for every round are available in the FAANGPlus app: open interview processes.